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2012 Vol.29(7)

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Flora of soil microorganism in the different grassland types in the Linzhi region
2012, 6(7): 1019-1022.
[Abstract](1136) [PDF 388KB](525)
Abstract:
The diluting plate method was used to isolate the soil bacteria, fungi and actinomycetes of alpine meadow grassland, marsh grassland and cultivation pasture in the Linzhi area. The results of this study showed that the bacteria was dominant microorganisms and accounted for 91.2%, and actinomycetes only accounted for 3.79% for each grassland type. The total microbes number was cultivation pasturemarsh grasslandalpine meadow. The amount of microorganisms at 0-10 cm soil layer was significantly greater than that at 10-20 cm soil layer. Soil moisture content in the different grassland types are very different, and low humidity conditions are advantageous to the growth of actinomycetes, but disadvantageous to fungi growth.
Features of the soil microorganism and its enzyme activities of orchard under different management measures in southern Xinjiang
2012, 6(7): 1023-1027.
[Abstract](1181) [PDF 399KB](490)
Abstract:
Effect of different management measures of orchard on soil Microorganism and its Enzyme activities was determined in southern Xinjiang. The results of this study showed that the total number of soil microorganism was mulching grassgrowing grassnotillageclean tillage. The mulching grass and growing grass treatments greatly increased the total number of soil microorganism by 32.90% and 11.63%, respectively, when compared to notillage, and increased by 38.09% and 15.99% when compared to clean tillage. In the microorganism components, the number of bacteria was dominant, and the actinomycetes and fungi came to the second and the third. The number of microorganisms showed obviously vertical distribution characteristics, in which the bacteria, actinomycetes and fungi were the highest at 0-20 cm layer for each treatment, and decreased with the increase of soil depth. The soil enzyme activities was the mulching grassgrowing grassnotillageclean tillage and they decreased as the soil depth increased, which was consistent with the number of microorganisms.
Soil nutrient characteristics of alpine meadow at different degradation degrees in Eastern Qilian Mountains
2012, 6(7): 1028-1032.
[Abstract](1290) [PDF 406KB](569)
Abstract:
The soil nutrients of alpine meadow at different degradation degrees in the eastern region of Qilian Mountains were reported in this study. The results of this study indicated that the contents of soil total nitrogen, total phosphorus, available manganese and iron decreased along with the degradation, and meanwhile, the pH value increased. The organic matter, available zinc, nitrogen and phosphorus content decreased firstly and then increased, and the organic matter content were the lowest at severe degradation degrees, and the available zinc, nitrogen and phosphorus content were the lowest at moderate degradation degree, and the total potassium and available copper content were similar among different degradation degrees. The content of organic matter and total nitrogen at 20-30 cm layer was higher that at surface soil layer at extreme degradation degree. On the whole the soil organic matter, total nitrogen, total phosphorus, available nitrogen, phosphorus and potassium, available phosphorus and phosphorus zinc declined and available iron, copper and manganese increased as the soil depth increased.
Assessment method of grassland loss from drought damage in Inner Mongolia
2012, 6(7): 1033-1038.
[Abstract](1093) [PDF 439KB](686)
Abstract:
The data of precipitation and herbage from monitoring stations in the Inner Mongolia was used to assess the grassland loss from drought damage from reduction of grassland yield and animal products and input funds of drought disaster relief. The results of this study showed the grassland yield was closely related to precipitation, and their correlation coefficient was 0.728. Optimal simulation model was established between grassland yield of different month for each grassland type and precipitation. Drought was graded by using percentage of precipitation anomaly and the relationship between drought grades and livestock loss was determined in this study, which quantitatively assessed the directly economic loss of grassland caused by drought. Assessment model fitted with growth rhythm and animal husbandry characteristics, and the case assessment was in accord with actual loss of animal husbandry caused by drought, implying that this model was able to assess the loss of grassland animal husbandry caused by drought.
Monitoring methods for wetland changes of Maduo County of China based on Landsat TM data
2012, 6(7): 1039-1043.
[Abstract](1260) [PDF 694KB](520)
Abstract:
The remote sense is a useful method to extract the information of wetland. To select an optimal method for extracting wetland information in the Tibetan Plateau, this study tested the accuracy of spectrum, normalized difference water index, modified normalized difference water index and unsupervised classification to extract the wetland information with Landsat TM data in the Maduo County of Qinghai Province. This study showed that the four methods successfully extracted the wetland information at a large scale. The accuracy of MNDWI to extract the wetland information was better than that of other three methods when the wetland distributed at above 4 500 m elevation regions and its accuracy was 80%. At low and mid regions, the accuracy of NDWI was higher than that of MNDWI, but the latter was higher than those of spectrum and unsupervised classification. This study suggested that the MNDWI was better to extract the wetland information due to minimizing the negative effects of the clouds and terrain.
Application of spatial analysis technology to quantifying leaf area of Medicago sativa plant based on GIS
2012, 6(7): 1044-1048.
[Abstract](961) [PDF 483KB](468)
Abstract:
An approach to measure the leave area of Medicago sativa was developed by using digital camera and GIS software in this study. Firstly, the pictures of M.sativa leaves were taken by the digital scanner; secondly, these pictures were vectored by R2V, and then data of perimeter and area were extracted from vectored pictures by GIS spatial analysis technology. The results of this study showed that average relative error of perimeter and area for extracted and actual values of reference were 0.177% and 1.68%, and were less than error range by leaf area apparatus (5%~15%). This study indicated that it was possible to measure leaf area of M.sativa by GIS spatial analyst technology. Compared to other methods of measuring leaf area, GIS spatial analyst technology had some merits with precision, simpleness, abundance, and could be extended in the fields of production and science research.
Recent advances and issues on locoweedfungal endophyte
2012, 6(7): 1049-1057.
[Abstract](1344) [PDF 462KB](702)
Abstract:
Locoweed is the most seriously poisonous plant which threats the sustainable development of pasture husbandry throughout the world. As has been confirmed, the main constituent of the locoweed which causes livestock poisoning is the indolizidine alkaloidswainsonine. Swainsonine has significant pharmacological activity of antibacterial, antiviral, antitumor, and improves immune system in addition to its toxicity. Most of the attentions of the research on SW concentrates on the producing mechanisms, toxicology and pharmacological activities of the SW. Rresearchers domestic and foreign has started to focus on the locoweed endophyte biodiversity, the relationship between the locoweed endophytic fungi and its production of swainsonine, as well as the mechanism of stress resistance since the end of 20th century to revealing the production mechanism of the toxic substances, the relationship between the endophytic fungi and the stress resistance, especially the interaction between the toxic substances and the endophytic fungi. Swainsonineproducing endophytic fungus has been isolated from a variety of locoweeds. And it has been found that there existed a close relationship between locoweed endophytic fungi and locoweed. This paper reviewed the main content and the present situation of the researches about locoweed endophytic fungi and made discussion about a number of issues in the field.
Advance in the turfgrass resistance
2012, 6(7): 1058-1064.
[Abstract](1409) [PDF 485KB](793)
Abstract:
The turf is one of important components of human ecosystem. Recently, the turf was widely planted and turf industry developed fast in China with the improvement of human life level and the concept. This study summarized the recent advances in drought, submergence, heat, cold, salinity resistance of turfgrass from seed germination, root configuration, photosynthetic characteristics, physiological and biochemical parameters of plants. The stress resistance of turfgrass varied with the species and experimental conditions. Meanwhile, this study reviewed the ways to improve turfgrass resistance from application of fertilizers, microorganisms and growth regulators, which will provide some concepts and approaches for turfgrass resistance.
2012, 6(7): 1065-1065.
[Abstract](852) [PDF 188KB](1331)
Abstract:
Effects of external hormones on induction and differentiation of callus of Chinese pennisetum
2012, 6(7): 1066-1071.
[Abstract](1250) [PDF 494KB](509)
Abstract:
The base of young shoots of Pennisetum alopecuroides was used as explants in this experiment to determine the effect of external hormones on induction and differentiation of callus of Chinese pennisetum by screening appropriate hormone type and concentration ratio. The results of this study showed that the 2, 4D was significantly effective for callus induction. The effect of hormone NAA and KT on growth was similar and their appropriate concentration was 0.5-1.0 mg L-1. The NAA was effectively useful for callus differentiation under combination 0.5-1.0 mgL-1 NAA and 3.0 mgL-1 6BA, but KT did not work on callus differentiation. This study suggested that the best induction culture medium was MS+2, 4D 3.0 mgL-1+NAA 1.0 mgL-1 +KT 1.0 mgL-1, and the best differentiation culture medium was MS+NAA 0.5 mgL-1 +6BA 3.0 mgL-1, which would provide information for resistance breeding of Pennisetum clones.
Effects of explants and nitrogen concentration on callus induction of Glycyrrhiza uralensis
2012, 6(7): 1072-1076.
[Abstract](1174) [PDF 419KB](470)
Abstract:
An experiment was conducted to determine the effects of different explants and nitrogen concentration on callus induction of Glycyrrhiza uralensis. The tissue culture method was used to compare the effects of root, stem, cotyledon and hypocotyls on callus induction and growth. The results of this study showed that the callus of hypocotyls was induced by higher induction rate, quicker induction time and lower browsing rate, indicating that the hypocotyls was optimal explants to induce the callus. The different concentration of nitrogen had the most significant effects on callus growth and induction of hypocotyls in certain hormone concentration, in which the lower and higher nitrogen concentration had negative effects on the growth of callus, and the optimal nitrogen concentration was 60 mmolL-1, which had the best effects on callus growth and induction. The different explants and nitrogen concentration were the important factors affecting the growth and induction of callus.
Tissue culture and rapid propagation of Lilium asitic hybrids cv. Prato
2012, 6(7): 1077-1083.
[Abstract](1093) [PDF 646KB](552)
Abstract:
The rapid propagation technique was studied in Lilium asitic hybrids cv. Prato with the bulb scales and leaves in vitro as explants and MS as basic medium with different hormones and concentrations. The results showed that the best medium for adventitious bud induction from bulb scales and leaves was MS+0.5 mgL-1 6BA+0.1 mgL-1 NAA, with which the highest induction rate was 85.0%, and the average number of shoots from every explant was 3.6. The best medium for adventitious buds induced from bulb scales was MS+1.0 mgL-1 6BA. The optimum medium for taking root was 1/2 MS+0.5 mgL-1 IBA,and the rooting rate was 86.7%. The transferred plants, with a survival rate of 85.0%, grew well.
Changeable features of several physiological parameters of seed development process of Puccinellia tenuiflora cv. Tongde
2012, 6(7): 1084-1087.
[Abstract](1034) [PDF 394KB](569)
Abstract:
Six methods were used to measure moisture content, physiological and biochemical parameters of seed quality of Puccinellia tenuiflora cv. Tongde in the seed development process. The results of this study indicated that the loss rate of seed moisture content showed a firstly quick and then slow trend and the seeds became mature when they developed for 26 days after peak anthensis with 27.85% of seed moisture content. The seed soluble sugar content of P.tenuiflora cv. Tongde decreased gradually with the seed development, on the contrary, the starch content increased. The maximum IAA content in the development process of P.tenuiflora cv. Tongde seeds was firstly appeared and the maximum was finally appeared. This study suggested that the seed vigor continually increased with seed development, peaking at 26 days after peak anthensis.
Effects of different saline stress on seed germination of tall fescue
2012, 6(7): 1088-1093.
[Abstract](1647) [PDF 388KB](816)
Abstract:
The experiment was conducted to determine the effect of different concentrations solution with NaCl, Na2CO3, Na2SO4, mixture of NaCl and Na2CO3, mixture of NaCl, Na2CO3 and Na2SO4 on germination rate, germination power, germination index, and vigor index of tall fescue seeds. The results of this study showed that the low concentration salt solution did not affect the germination of Tall Fescue seeds but the high concentration salt solution significantly inhibited the germination of Tall Fescue seeds. With the increasing of salt concentration, the germination rate, germination power, germination index, vigor index of tall fescue seeds decreased, and the root and shoot growth of seedlings reduced obviously. The order of seed germination restrained by different salt treatments was Na2SO4mixture of NaCl+Na2CO3+Na2SO4NaClmixture of NaCl+Na2CO3Na2CO3.
Effects of endophytic fungi on seed germination of perennial ryegrass under salt stress
2012, 6(7): 1094-1099.
[Abstract](1531) [PDF 426KB](734)
Abstract:
To evaluate the effect of salinity and endophytic fungi on seed germination of Lolium perenne, 8 perennial ryegrass varieties with high endophyte infection rate (80%) and 8 varieties with low rate (20%) were used for germination experiment under salinity stress. The results of this study showed that the relative germination rate (RGR), relative vitality index (RVI), relative root length (RRL), relative shoot length (RSL) and relative root/shoot ratio (RRS) decreased with increasing NaCl concentrations. There was no significant difference observed in RGR, RVI, RRL and RSL between high and low infection rate under 0, 85, and 170 mmolL-1 NaCl stress, while RGR, RVI, and RSL of seeds with high infection rate were significantly (P0.05) higher than that of low infection rate under 255 mmolL-1 NaCl stress. In a word, seed germination of perennial ryegrass was inhibited by salt stress, but endophyte infection could benefit seed germination under high salinity condition.
Influence of floret position and flowering time on seed set and thousand seed weight of Ceratoides arborescens
2012, 6(7): 1100-1105.
[Abstract](942) [PDF 369KB](577)
Abstract:
Some fruiting characters in 4 years old and 8 years old of Ceratoides arborescens populations were investigated in this study by determining the relationship between floret position and flowering time on seed set and thousand seed weight. The results of this study showed that the seed set rate and thousand seed weight of younger plants were higher than that of older plants because the younger plants had less branches than older plants, which wa beneficial to nutrients concentration. The seed set was related to the floret position and flowering time, indicating that the seed set rate in part of the inflorescences that flowered earlier was higher than that in the part that flowered later, and the thousand seeds were showed a simlar trend. As far as the whole population was concerned, the seed set rate and thousand seed weight in the middle layer of the canopy was the highest, and those in the lower layer of the canopy was the least. Those flowered in profuse flowering phase had the highest oppotunity to fruit, and their seeds were the heaviest, but those flowered in early flowering phase had the least opportunity to fruit, and their seeds were also lighter than those flowered later.
Evaluation on the salt tolerance of 38 germplasm resources of Elytrigria repens at seed germination stage
2012, 6(7): 1105-1113.
[Abstract](1257) [PDF 368KB](440)
Abstract:
Based on simulation salt stress with mixture of 1.2% of NaCl∶Na2SO4(1∶1), the routine paper bed culture was used to estimate the salt tolerance of 38 germplasm resources of Elytrigria repens at the seed germination stage by measuring the germination rate, germination energy, germ length, embryonic root length, vitality index, germination salt tolerance index and germination stress index. The results of this study showed that the salt stress decreased the germination rate, germination energy, germination Index and vitality index of E.repens, inhibited the growth of E.repens germ and radical, and also decreased the germination characteristic of E.repens. According to the comprehensive evaluation value, the salt tolerance sequence of 38 E.repens accessions from high to low was E03, E31, E16, E17, E42, E26, E04, E25, E12, E38, E15, E36, E13, E32, E09, E21, E07, E08, E01, E29, E10, E18, E24, E28, E30, E23, E11, E39, E02, E34, E19, E35, E06, E40, E33, E41, E37, E27.
Comprehensive evaluation of drought resistance for 26 cultivars of Kentucky bluegrass at seedling stage
2012, 6(7): 1114-1119.
[Abstract](1416) [PDF 370KB](703)
Abstract:
A pot experiment was conducted to comprehensively assess on the drought resistance of 26 cultivars of Kentucky Bluegrass at the seedling stages by measuring the growth of seedlings. This study showed that plant height, shoot fresh weight, shoot dry weight, root dry weight decreased and ratio of root to shoot increased after two weeks of drought treatment. The comprehensive assessment of drought resistance showed that Midnight performed well and Brilliant was the worst among 26 cultivars.
Effects of molybdenum nutrition on the total yield of Salicornia europaea under different nitrogen solution
2012, 6(7): 1120-1126.
[Abstract](1096) [PDF 553KB](461)
Abstract:
The seawater solution cultivation was conducted to determine the effects of different concentrations of molybdenum nutrition on the total yield of Salicornia europaea under different nitrogen solution. The results of this study showed that the nitrate reductase and xanthine dehydrogenase activity, the pigments and ureides, and total yield of S.europaea increased with the increase of molybdate solution under two seawater solution cultivations. Foliar spray of 3 molL-1 molybdate was more beneficial to S.europaea growth than addition of solution. The obvious difference of S.europaea growth was observed between NO3-N and NH4+N solution, indicating that the NO3-N solution was more beneficial to S.europaea growth than NH4+N solution because the NH4+N solution increased the chlorophyll content of S.europaea shoot, the activity of xanthine dehydrogenase and the level of ureides, decreased the activity of nitrate reductase and biomass of S.europaea when compared to NO3-N solution. This study implied that the supply of molybdenum and NO3-N for Salicornia in seawater increased the plant biomass by increasing the activities of NR and XDH.
Effects of base selenium on the herbage yield and agronomic characteristics of alfalfa at different growth stages
2012, 6(7): 1127-1131.
[Abstract](1233) [PDF 402KB](546)
Abstract:
A field experiment was conducted to determine the effects of different levels of selenium on the herbage yield and agronomic characteristics of alfalfa at different growth stages. The results of this study showed that application of selenium increased the herbage yield, accumulation rate of dry matter, plant height and leaf/steam at different growth stages to some extent. The 0.45 kgha-1 selenium had the highest herbage yield, accumulation rate of dry matter and plant height at the branching stage, bud stage and early flowering stage, in which the herbage yield increased by 32.67%, 24.78% and 37.93%, respectively, and the plant height increased by 10.01%, 14.00% and 10.51%, respectively, and the leaf/steam increased by 6.43%, 8.00% and 12.80%, respectively. The accumulation rate of dry matter with application of 0.45, 1.05 and 0.75 kgha-1 selenium was the highest at the branching stage, bud stage and early flowering stage, respectively. The growth peak of alfalfa without selenium fertilization was found at the bud stage and its accumulation rate of dry matter decreased at the early flowering stage, but the alfalfa with selenium fertilization continued to grow.
Comprehensive evaluation on salt tolerance of different desert shrubs in Ulan Buh Desert regions
2012, 6(7): 1132-1136.
[Abstract](1215) [PDF 408KB](668)
Abstract:
Based on the principal component analysis, the cluster analysis and the membership function method, a pot experiment was conducted to evaluate quantitatively salt tolerance of the seedlings of Nitraria tangutorum, Nitraria sibirica, Zygophyllum xanthoxylon, Ammopiptanthus mongolicus, Caragana korshinskii, Reaumuria trigyna and Tamarix austromongolica growing in the Ulan Buh Desert by measuring many morphological and physiological indices. This study proposed that the ground diameter, stomatal conductance, water use efficiency, water potential, branch length, above dry weight, main root length, lateral root length, lateral root number and root diameter were considered as the important indicators of salttolerance evaluation for the hese desert shrubs. Seven shrubs were divided into strong, medium and weak salt tolerance, in which the R.trigyna and the T.austromongolica were strong, and the N.sibirica and N.tangutorum was medium, and the others were weak. The salt tolerance of seven desert shrubs was in order as R. trigynaT.austromongolicaN.sibiricaN.tangutorumA.mongolicusZ.xanthoxylonC.korshinskii.
Suitability of several alfalfa varieties to alpine regions in the QinghaiTibetan Plateau
2012, 6(7): 1137-1141.
[Abstract](1324) [PDF 329KB](529)
Abstract:
A field experiment for four years was conducted to estimate the suitability of several alfalfa (Medicago sativa) varieties, including Millionaire, AmeriGraze401, Alfaking, WL525HQ and Algonguin, to alpine regions in the QinghaiTibetan Plateau. This study showed that the phenological phase of five varieties of alfalfa did not show a difference, and all varieties did not produce the mature seeds. The varieties named WL525HQ, Millionaire, and Algonguin performed well when branches per plant, height and biomass were used to estimate the suitability. On the basis of leafstem ratio, the forage quality of Millionaire and Algonguin was better than Alfaking, AmeriGraze401 and Millionaire. The wintering rate of all varieties was not different at the experimental end. Combing the productive performance and forage quality, Algonguin and WL525HQ were suitable for planting in the alpine regions with better resistance cold, which would optimize the structure of cultivation pasture in the alpine regions.
Effects of alfalfa green manure on rice yield and soil fertility
2012, 6(7): 1142-1147.
[Abstract](1577) [PDF 421KB](1031)
Abstract:
A field experiment was carried out to determine the effects of alfalfa green manure and nitrogen fertilizer on rice yield, soil organic matter, soil nitrogen, soil available P and soil available K by planting alfalfa as green manure into winter fallow fields in the south region of China. The results of this study showed that the rice yield in the alfalfa manure treatment and alfalfa manure+nitrogen treatment increased by 48.2% and 72.1%, respectively. Alfalfa green manure significantly increased the contents of soil organic matter, total nitrogen, available P and available K, implying that Alfalfa green manure improved the physical and chemical properties of soil. The alfalfa+nitrogen treatment effectively improved the soil organic matter content and P and K activity, which promoted the rice to uptake more soil P and K, resulting in the increase of rice production. This study suggested that alfalfa was an effective green manure for improving rice soil quality, increasing nitrogen efficiency, and increasing rice yield, and would be a very good green manure resource for improving farm land quality in the south region of china.
Succession characteristics of Zygophllum xanthoxylon communities in the edge regions of Tengger Desert
2012, 6(7): 1148-1152.
[Abstract](1006) [PDF 392KB](576)
Abstract:
Based on appearance of Zygophllum xanthoxylon community, crown and numbers of individual plant, the succession processes of Z.xanthoxylon community were classified into three stages, and they were pioneer stage dominated by Oxytropis aciphylla and Z.xanthoxylon stage, canopy closure stage dominated by Z.xanthoxylon+O.aciphylla+Caragana roborovskyi and recession stage dominated by O.aciphylla+C.roborovskyi+Z.xanthoxylon, respectively. A field survey in the edge regions of Tengger Desert was conducted to determine the plant species composition, distribution pattern of population and important value of dominant species of different succession stages in this study. This study showed that 17 plant species were identified in this survey, and they belonged to 14 genera of 7 families. The species richness was not significantly different, and the species diversity firstly increased and then decreased when the Z.xanthoxylon community developed from pioneer stage to recession stage. The ecological dominance was inverse trend with the species diversity. The Z.xanthoxylon population was uniform distribution at pioneer stage, aggregation distribution in canopy closure stage and recession stage. The important value of Z.xanthoxylon was the biggest at canopy closure stage, and the others were the secondary.
Plant communities and their diversity of Maqu Alpine Wetland
2012, 6(7): 1153-1157.
[Abstract](1202) [PDF 398KB](613)
Abstract:
The sample belts were used to survey the plant communities and their diversity of Maqu Alpine Wetland. This study showed that 24 plant species belonging to 22 genera of 14 families were identified in this field survey, in which the Kobresia pygmaea was dominant, and the Polygonum viviparnm, Potentilla anserine, and Scirpus triquete were subdominant. In the life form components, the hemicryptophyte was dominant and accounted for 83% of the total. The vertical structure of plant communities were divided into three layers. The richness index (R1,R2), diversity index (Simpson diversity index D, ShannonWiener diversity index H) and evenness index (E1,E2) was 17.75, 1.50, 1.34, 0.39, 0.23, and 0.09, respectively.
Effects of feeding Phalaris tuberose cv.Wenning on black goat
2012, 6(7): 1158-1162.
[Abstract](1048) [PDF 396KB](542)
Abstract:
The Weining Buld Reed Canary fresh grass (Phalaris tuberosa cv. Weining) at the different growth period was used to feed the black goats with different methods to assess the feeding effectiveness by using the palatability, feed consumption and economic benefits. The results of this study showed that the fresh P.tuberose herbage at the different growth stages showed a different effectiveness, in which the palatability were the best when the P.tuberose was period from the tiller stage to heading stage with the plant height of 50-120 cm, and it was the worst when P.tuberose was flowering stage. Different feeding approaches and different hungry degrees showed a different the palatability and feed intake, indicating that the cuttingfresh herbages showed the best feeding effectiveness when the black goats were in hunger and in a half full; and the combination of cuttingfresh herbage and 0.5% salt water showed the best feeding effectiveness when the black goats were in a full eight or nine. The addition of 8.8% green fodder had the better economic benefits than the only the green fodder, which increased the 26.5 CNY per black goat.
Application of Gray Model to predict grain output in the Minqin County based on Matlab Language
2012, 6(7): 1163-1169.
[Abstract](1187) [PDF 484KB](533)
Abstract:
Based on the past data of the grain output of the Minqin County in Gansu Province, the GM (1,1) predicting model was operated with the support of the MATLAB software and its accuracy was tested in this study, which was used to predict the grain output of the Minqin County for each year from 2011 to 2015 and periods of 2011-2019, 2020-2028 and 2029-2037. The predictive results of model showed that the grain output of the Minqin County increased in the next few years, but its increase rate was not much, indicating that the growth potential of grain output was low. This study proposed that the development of grassland agriculture made sure food security and improved the worsening ecological environment in the Minqin County by adjusting the proportion of grain crop, cash crop and grass, implying that speeding up the development of grassland agriculture was a necessary prerequisite to sustainable development of Minqin County, which could be used to provide theoretical basis for policymaker to grassland agriculture was a necessary prerequisite to sustainable development of Minqin County, which could be used to provide theoretical basis for policymaker to present the development plans of Minqin County.
A selective approach to typical householder farm in the pastoral regions of the QinghaiTibet plateauA case study in Maqu county of Gansu Province, China
2012, 6(7): 1170-1175.
[Abstract](1354) [PDF 689KB](557)
Abstract:
The selection of typical householder farm in the pastoral area of the QinghaiTibet Plateau is very important for technology extension of animal husbandry. Based on the data of the grassland area, the livestock number, the income and expenditure per householder from 20 householders living in the Maqu County, this study proposed the selection approach and standard for typical householder farm by combining the productive resources and management level. Based on the proposed standards, the householders of No.2, No.12, No.13 and No.19 were determined as typical householders in the Maqu County, and their grassland area, livestock number and income/expenditure per householder were 195.0 hm2, 452.5 SU, 5.08 ten thousands CNY and 4.18 ten thousands CNY, respectively. This study suggested that the selective householders reflected the current status of management level and life standard of farmers in the study area.
International trade structure of forage seed of China and its enlightenment
2012, 6(7): 1176-1181.
[Abstract](920) [PDF 441KB](551)
Abstract:
Based on the situation and characteristics of china forage seed trade from the views of the international trade commodity structure and geographical distribution, this study presented the development trend of forage seed trade of China and proposed its enlightenments. This study showed that the requirement of China for forage seed demand would increase in the future and the import of forage seed in the short term would remain in the high level, but the demand for forage seeds of main varieties would be supplied by the domestic market. It was currently urgent for China to ensure the standardization of import forage seed, establish the base of specialization production for forage seed and put technology into grassland industry.