Welcome Pratacultural Science,Today is

2009 Vol.26(4)

Display Mode:          |     

Analysis of niche suitability and spatial difference of grassland ecosystem in Gannan
 Sun-Feng-Ju, CHEN Yang
2009, 3(4): 1-5.
[Abstract](1544) [PDF 770KB](794)
Based on the historical research results, the mathematical model of niche suitability and evolutional momentum of grassland ecosystem in Gannan was established by means of niche suitability theory. Eight indices were used to measure the niche suitability of the grassland ecosystem and evolutional momentum, including population density, GDP per capita, GDP per capita in the first industry, farmer's annual net income, ratio of grassland degraded at medium level, average biomass, grassland area damaged by rodents, animal production value per unit grassland and stocking rate. The resulted showed that there were big spatial differences of grassland ecosystem niche suitability among different counties and cities in Gannan. The niche suitability could be ranked into 5 levels and their spatial differences were analyzed.
Study on the characteristic of ecoclimate effect in forest zone of Ziwuling on Loess Plateau
Li-Tai WANG, Tian-Feng ZHANG, Jin-Chong BO, Yu-Qin MAO, Su-Juan MA, HUANG Bin
2009, 3(4): 6-11.
[Abstract](1897) [PDF 1990KB](795)
In order to explore the characteristics of ecoclimate effects, the annual variation of meteorological factor was analyzed by using the meteorological data from Taibai Weather Station which located in Ziwuling forest region, Huachi Weather Station and Qingcheng Weather Station which located in the boarder of forest area. The result showed that the temperature and evaporation in Ziwuling forest region in each month were obviously lower, and meanwhile, the precipitation in May, July and September and air humidity from April to September were higher than that in the surrounding area. The rain days in forest region were more than that in the surrounding area. It means that the climate in Ziwuling forest region was cold and humid.
Monitoring and evaluation of productivity of mountain meadow in northern Xinjiang
CHAI Qi, LI Xia, Tian-Gang LIANG
2009, 3(4): 12-15.
[Abstract](1587) [PDF 1017KB](836)
Based on the field survey, the variation of coverage, average height and fresh grass yield of mountain meadow in northern Xinjiang were analyzed. The result showed that the variation changed periodically and showed the single peak pattern which was strongly associated with the temperature and precipitation. The coverage, average height and fresh grass yield reached the highest in mid June (96%, 36.4 cm and 8 422 hg/hm2 respectively) and the lowest in mid May (80%, 14.8 cm and 1 086 hg/hm2) within one year. The variation among years depended on the precipitation and temperature, in which, the response of fresh grass yield was the most sensitive. The amplitude of variation of coverage, average height and fresh grass yield from 2004 to 2006 was 2.94%, 3.36% and 42.59% respectively.
Amphicarpy and dispersal mechanism of Viola tuberifera endemic to QinghaiTibetan Plateau
Meng-Meng GONG, SU Xue, SUN Kun
2009, 3(4): 16-19.
[Abstract](1878) [PDF 702KB](823)
Viola tuberifera endemic to QinghaiTibetan Plateau was used to study the amphicarpy and morphological characteristics, spatial location and dispersal mechanism. The results showed that it has three types of fruits, i.e., CH fruit, aerial CL fruit and subterranean CL fruit. The these three fruits were different in quantity, spatial location and mature period. V. tuberifera has sexual and asexual types of diaspores, i.e., CH seeds, aerial CL seeds, subterranean CL seeds and cloning organ bulbs. Though the number of CH seeds was relatively small, the outcross accounted for the major part of CH seeds for necessary variation. The number of aerial CL seeds was the largest and this could ensure the primary approach for longdistance spread. Two subterranean diaspores could not move so the shortdistance spread could keep the continuation of species. The amphicarpy and the diversity of dispersal mechanisms of V. tuberifera was the special reproduction mode as the result of adaptation to the environment of QinghaiTibetan Plateau. The amphicarpy was firstly found in Violaceae in this study.
Application progress on hyperspectral remote sensing in grassland monitoring
ZHOU Lei, Xiao-Beng XIN, LI Gang, Gui-Xia YANG, Hong-Bin ZHANG
2009, 3(4): 20-27.
[Abstract](1720) [PDF 943KB](1547)
The application of hyperspectral remote sensing in vegetation research was introduced and the related application progress was reviewed and evaluated in this paper. The application of hyperspectral remote sensing in grassland, including the biomass estimation, grassland type identification and chemical composition estimation, were reviewed as well. The development trend in this field was discussed. With the introduction and usage of new technologies, such as digital photography and GPS, the hyperspectral remote sensing will play more important role.
Influence of rainfall in growing season and clipping intensity on aboveground biomass of Leymus chinensis steppe
HE Feng, Xiang-Lin LI, Li-Jiang MO
2009, 3(4): 28-32.
[Abstract](1654) [PDF 1567KB](931)
The study on the biomass change of Leymus chinensis, Artemisia eriopoda, Cleistogenes squarrosa and community of L.chinensis grassland under different rainfall conditions by using rainfall shelter and irrigation to adjust natural rainfall and using clip frequency to adjust clipping intensity was conducted from 2005 to 2007. The result showed that the biomass of A. eriopoda , C. squarrosa and the community except L. chinensis were significantly decreased in R1 treatment (rainfall was reduced by 50%, P0.05).In R3 treatment (rainfall was increased by 50%), the biomass of A. eriopoda and C. squarrosa performed an increasing tendency, however both L. chinensis and community showed a decreasing tendency (P0.05). In C2 treatment (clipping frequency was increased), the biomass of L. chinensis, A. eriopoda and the community showed the significant increasing tendency (P0.05). In 2006 (rainfall was 311 mm), the biomass of A. eriopoda, C. squarrosa and the community except L. chinensis increased significantly compared to that in 2005 (rainfall was 216 mm, P0.05). In 2007 (rainfall was 290 mm, drought in spring), the biomass of L. chinensis and C. squarrosa decreased significantly compared to that in 2006 (P0.05), the biomass of L. chinensis was even lower than that in 2005. The coefficient of variation (CV) on biomass of C. squarrosa, A. eriopoda, L. chinensis and the community was 85.2, 58.3, 36.0 and 16.5 respectively and the difference was significant.
A study of selfcompatibility and pollinations and separation of offspring traits of alfalfa
Lin-Wei LV, Zhen-Wu WEI, DIAO Yan, Xiao-Li GENG, Gao-Jun LIU, Zi-Nian WU
2009, 3(4): 33-36.
[Abstract](1731) [PDF 1017KB](1070)
Eight alfalfa cultivars from different sources were used to study the characteristics of selfcompatibility and pollination approaches. The results showed that the selfcompatibility of alfalfa among the cultivars was different, and the selfcompatibility indexes of all materials were ranged from 0 to 1.39. In which, the selfcompatibility index of 2 cultivars were over 1.00, 5 cultivars was from 1.00 to 0, and 1 cultivar was 0. The phenomenon of gradual death in batches was found in the S1 growth course, and the final survival rate was only 34.80% and 32.30%. the seed rate of selfcousins is the highest in 4 selfpollinations, so the selfpollination of selfcousins was appropriate to popularize and apply in alfalfa selfpollinate.
Study on the comparison of essential oil extracted with supercritical CO2 technology from Artemisia capillaris
TAO Jian, Bao-Tang DIAO, Dun-Long WANG, ZHANG Ji
2009, 3(4): 37-42.
[Abstract](1515) [PDF 956KB](746)
Preliminary study on regional test of two introduced wheatgrass cultivars
Na-Chi GU, Shua-Zheng GUO, SHU Hao, LI Chi
2009, 3(4): 43-49.
[Abstract](1551) [PDF 633KB](783)
The regional test of two introduced wheatgrass cultivars, Agropyron desertorm cv. Тауумский and A. cristatum cv. Aксенгерский from Kazakhstan, was conducted under the rain feed condition in Nanshan of Urumqi and Yili Valley of Xinjiang from 2004 to 2007 and A. mongolicum cv. Neimeng was used as the check. The biological characteristics, stress resistance and economic characters were measured. The results indicated that two introduced cultivars were better than the check.
Separation of alfalfa leaf protein and analysis of nutrients in its residue
An-Fen XU, Rui-Qin LI, SHUI Rong, Mei-Rong XU, Zheng-Beng SONG
2009, 3(4): 50-54.
[Abstract](1719) [PDF 981KB](806)
he secondary processing for destain and removing smell was needed to separate the alfalfa leaf protein (ALP) into white component for edible purpose and green component for forage purpose and the processing procedure was still impractical at present. The white and green components were separated in processing stage in this study and the protein content of extraction was increased to 72%. The utilization value of leaf protein was greatly improved due to the reduction of processing cost and the valueadded product. The nutrition components in the residue were analyzed for further utilization.
Effect of salinity soil improvement on crop production
DIAO Yin, Qi Chai-, Chen-Ying-Ying, Shu-Mo-Ge-, Zhi-Long LI, WEI An
2009, 3(4): 55-58.
[Abstract](1464) [PDF 598KB](860)
Soil salinity accumulated in lower areas with the water movements and high evaporation in Hexi irrigated agricultural region. The accumulation of salinity resulted in the unsuitable conditions for forage and crop growing. The objective of this study was to test the productivity of forages and crops that were cultivated on the plots where the original salt content (0 to 10 cm) was about 18% to 42% and the salt was removed through washing channels. The results indicated that the grass and protein yields of alfalfa (Medicago sativa) were increased by 0.53 times and 3.57 times compared with beer barley (Hordeum vulgare) under 240m distance between two washing channels. They were 1.38 times and 5.60 times, 4.82 times and 16.31 times higher than the yields of beer barley under 350m distance between two washing channels and the yields of the untreated area (natural grassland), respectively.
Study on sustainable development model of ecological agricultureunder contour hedgerow in small watershed
TUN Yang, TANG E, Yu-Hui HU, FU Lei
2009, 3(4): 59-63.
[Abstract](1591) [PDF 1147KB](820)
The sediments in the rivers mainly come from slope farmland. According to government policy, land steeper than 25 is banned to cultivate, but due to farmland, fuels and feed shortage, the resources competition among economic development, agricultural industry and water and soil conservation in these areas is very strong. This paper presented an integrated technique system called contour hedgerow, a sustainable development model of ecological agriculture was established in farmland steeper than 25after returning to pasture in small watershed. The economic profit analysis of the model proved its effectiveness.
Study on the cological safety assessment of farminggrazing transition zone in China
Zhi-Wei WANG, WANG Beng, WANG Xun, Hua-Tong ZHANG, Quan-Gong CHEN
2009, 3(4): 64-73.
[Abstract](1575) [PDF 1339KB](997)
The area between farming and animal husbandry is the ecological transition zone between traditional agricultural area and pastoral area in China. It is also called agropastoral area or ecological ecotone. It is very important in terms of the economic, social development, and the environmental protection in China. It is the China's largest climate ecological transition zone and the unique important interface among industries. Based on the special ecological conditions in this area and in consideration of the existing natural environment pressure, the socioeconomic pressure and the human positive pressure, the economic and social response and the current and potential pressure on ecosystems were selected as the indicator and evaluation criteria to evaluate the ecological environment and the overall security situation assessment of the Chinese ecotone. So, based on the characteristics of farmingpastoral zone and the concept of pressurestatusresponse model, an indicator system for assessment of ecological safety and the appropriate standards was setup as the theoretic basis for the future research on assessment of farmingpastoral zone safety and management of ecoenvironment.
Comparison of productivity and feeding characteristics of two sweet sorghums cultivars
Jin-Chang SONG, FAN Chi, Yi-Bing NIU, Zhi-Xin FU, Zheng-Zhu LIU, Su-Fen LI, NI Jing
2009, 3(4): 74-78.
[Abstract](1748) [PDF 540KB](830)
Two sweet sorghum cultivars, Sorghum dochna cv. Liaotian No.1 and No.3, were used to test the features of adaptability and dairy cow feeding for high quality forage screening. The results showed that the two cultivars grown well in the east of Hebei Province and could be used as green roughage and silage. The suitable growth density was 60.0 to 67.5 thousand plants/hm2. The fresh matter yields of Liaotian No.1 and No.3 reached 29.98 to 33.7 t/hm2 and 31.51 to 35.45 t/hm2 respectively. The sweet milk yields of dairy cows fed with Liaotian No.1 and No.3 as the basic diet were 2.64 kg and 2.49 kg higher than that of maize silage (contents of dry matter, lactoproteid and milk fat were same). Liaotian No.1 and No.3 were excellent green roughage because it was easy to be utilized by green feeding and silage making, and its yield was high.
Cultivar selection of silage maize in Chengdu
Xiao-Yu LIANG, Mao-Zhong FU, WANG Huai, Tian-Bao CHEN, Li-Qing YI
2009, 3(4): 79-82.
[Abstract](1808) [PDF 440KB](920)
Nine domestic silage corn cultivars were used to compare the productivity due to the increasing growing area and lack of silage maize cultivars in Sichuan. The growth period, grass yield, plant height and growth rate were measured and the result indicated that Sicao NO.1 was the best in terms of yield, quality and adaptation. Jindan NO.2 was the best in terms of protein content and premature.
Study on the leaking of mineral elements from leaf of Eupatorium adenophorum treated by crude toxins of Lecanosticta acicola
Gong-Yu ZHANG, Ru-Qiu HE
2009, 3(4): 83-86.
[Abstract](1665) [PDF 479KB](857)
Contents of 7 mineral elements in leaf of Eupatorium adenophorum treated by crude toxins of Lecanosticta acicola were measured by ICPOES. The results indicated that the contents of Ca and K decreased by 65.9% and 59.5% in leaf (in vitro) and 32.9% and 53.9% in plant (in vivo) respectively. Contents of Mg, P, Mn and Zn in the treated leaf increased significantly. Compared with the mineral elements in crude toxin solution, Ca, K and Fe increased and Mg, P, Mn and Zn decreased in leaking liquids of the leaf treated by crude toxins and the content of Ca in the leaking liquids was about 30 times more than control.
Preliminary study on soil seed bank of weeds in winter wheat field on Loess Plateau
E-Li JU, Ting-Pu WANG, CHEN Chuo, Qi-Feng HE
2009, 3(4): 87-93.
[Abstract](1670) [PDF 954KB](879)
Soil seed bank of weeds is the main resource of weeds in crop field. In order to explore the influence of microclimate and cultivation on seed bank of weeds, the study was conducted in Qingyang City and Tianshui City. The results showed that there were 20 species of weeds (belonging to 9 families) in Qingyang. The total number of weeds was 2 520 plants/m2 and 1 964 plants/m2 in the center and edge of field respectively, and the main weeds were Echinochloa crusgalli, which accounted for 47.54% and 30.50% of the total respectively. There were 13 species of weeds (belonging 10 families) in Tianshui. The total number of weeds was 3 873 plants/m2 and 3 506 plants/m2 in the center and edge of field respectively, and the main weeds were Herba cephalanoploris and Arenaria serpyllifolia, which accounted for 34.68% and 28.27% of the total in field center, and 32.29% and 32.63% of the total in field edge. The number of weeds in field edge was higher than that in field center. E. crusgalli, H. cephalanoploris and A. serpyllifolia were the dominant species in winter wheat field. In addition, the strategies for weed control were provided based on the research results.
Study on forecasting models of grasshopper occurrence area in Qinghai Province
Ying-Cun YAN, Feng-Xia LI, Liang-Dong YA, Li-Meng SONG, Zong-Tai MA, Bing-Rong ZHOU, ZHANG Juan, Su-Hua GAO
2009, 3(4): 94-98.
[Abstract](1808) [PDF 533KB](797)
Grasshopper occurrence area,atmospheric circulation characteristics and climate data in Qinghai Province from 1995 to 2006 were collected to analyze the relationship between climate conditions and grasshopper occurrence area, and the multiple regression prediction models of grasshopper occurrence area were built at province, prefecture and county levels. The result showed that subtropical anticyclone intensity index, vortex intensity area and index impacted remarkably on grasshopper occurrence area. The grasshopper occurrence area was increased along with the subtropical anticyclone intensity index. However, it was decreased along with the vortex intensity area and vortex intensity index. During hatching period of grasshopper, the precipitation performed an important role. The relationship between grasshopper occurrence area and temperature was positive remarkably. The temperature showed the positive impact on spawning, winterovering and incubation of grasshopper and lower temperature was the critical factor to inhibit the outbreak of grasshopper. Low air humidity during hatching period was helpful to the outbreak. The models were used to forecast the grasshopper occurrence in 2007 and the result was satisfied and this would serve as a scientific basis for prevention and control of grasshopper disaster in Qinghai Province.
Research progress on toxicity, harm and prevention of Oxytropis
LI Quan, Dun-Nian LI, Shuang-Lun DAO, Yu-Jing DING, HE Lan, WANG Zheng
2009, 3(4): 99-105.
[Abstract](2618) [PDF 920KB](932)
The research progress on the source, toxicology, harm to livestock and prevention and treatment methods of Swainsonine, which was the main toxic component of Oxytropis, was reviewed in this paper. The swainsonine mainly originated from the metabolism of Oxytropis endophyte, and its concentration was related with the nitrogen fixation of nodule, but not genetic characteristics. Swainsonine was transported to the tissue organ of livestock by blood and inhibited mannosidase activity when accumulated to a certain degree, which leads to the degeneration of cells in the form of cavitation. Then, the immune, health, mental behavior, digestion, absorption, growth, propagation and introduction of livestock were influenced. At present, the preventive methods were rotational grazing, isolation and anorexia, and the main treatment to this disease was to treat the livestock with medicine.
Study on the adaptability of Festuca festina and F. arundinacea in hot and dry summer in Chongqing
Chu-Jing HU, Xiao-Lin YI, Ming-Yang LI
2009, 3(4): 106-109.
[Abstract](1771) [PDF 1023KB](821)
Festuca festina and F. arundinacea were used to test their adaptability under high temperature and drought stress for 8 days in Chongqing. The result indicated that the response of F. arundinacea to the stress was more sensitive because of its obvious damaged symptoms. Along with the stress, the chlorophyll content rapidly reduced, the malondialdehyde content increased and the soluble sugar accumulation was relatively slow for F. arundinacea. It could be concluded that F. festina was better than F. arundinacea for hot and drought resistance in summer.
Study on regeneration system optimization of Zoysia japonica cv. Zenith in vitro
Xiao-Gong LI, Dun-Qi ZONG, Jian-Meng SHE, Jian-Xiu LIU
2009, 3(4): 110-116.
[Abstract](1744) [PDF 1782KB](894)
Mature seeds of Zoysia japonica cv. Zenith were used as explants for callus induction. The result showed that the optimum medium of callus induction was MS medium containing 4.0 mol/L 2,4D. The frequency of callus induction was 69.9%, and the rate of embryogenic callus was 28.78%. Embryogenic callus contained two callus types. Type I was yellowy, wettish and granular(27.36%) and TypeⅡwas yellow, thirsty and granule(1.42%). During callus subculture, the embryogenic callus could maintain the plant regeneration capability by increasing agar concentration. The optimum differentiation medium was MS medium plus KT 4.0 mg/L or 6BA 3.0 mg/L and the ratio of shoot differentiation was over 90%. The suitable rooting medium was 1/2 MS medium and the rooting ratio was 100%.
Effect of seasalt stress on the growth and ion contents of Paspalum vaginatum
JU Die, Hong-Ru GU, Xiao-Xian ZHONG, Cheng-Long DING, Yi-Xin CHEN
2009, 3(4): 117-120.
[Abstract](1404) [PDF 623KB](828)
Growth response and contents of Na+, K+, Ca2+ and Mg2+ of seashore paspalum (Paspalum vaginatum) were studied by treating it with 1/2 Hoagland solution containing seasalt with concentrations of 0, 6.8, 13.6, 20.4, 27.2 and 34 g/L. The results showed that the growth of seashore paspalum was inhibited by seasalt stress, and the inhibiting was stronger along with the increasing of seasalt concentration. The content of Na+ in leaf and stem increased with the increasing of seasalt concentration, while the seasalt concentration was 34 g/L, the content of Na+ in leaf and stem were 23.35 mg/g and 22.27 mg/g. While the seasalt concentration was 6.8 g/L, the content of Na+ in root was no significant different with CK, but it was significant higher than CK in the other treatments. The content of K+ in leaf kept at 25 mg/g and did not change with increased seasalt concentration. The content of K+ in stem was decreased gradually with the increased seasalt concentration. The maximum content of K+ in root was 6.4 mg/g at 20.4 g/L of seasalt concentration; it decreased at 34 g/L but higher than CK. The stable content of K+ in leaf might be one of reasons for the strong tolerance of seashore paspalum.
Effect of low temperature and plant growth regulators on callus induction and regeneration of Zoysia japonica cv. Qingdao
Xiao-Hua SHU, Ji-Xiong SUN, Hui-Min LIANG, LI Jing
2009, 3(4): 121-126.
[Abstract](1726) [PDF 1469KB](873)
The stem apex, stem node and root cusp were used as the explants to study the effect of plant growth regulators and low temperature pretreatments on callusing and regeneration of Zoysia japonica cv. Qingdao. The results showed that 3 times (30 days) of low temperature pretreatment (10 ℃) was the best and the highest callus induction rate could be obtained from the 3 types of explants, in which, the stem nodes was the best and its callus induction rate reached 94%, 38% higher than CK and the regeneration rate was 74.47%. As for, , all of the 3 types of explants got the highest rates of callusing and regeneration on the culture medium of MS+2,4D(2 mg/L)+6BA(0.1 mg/L), and the stem node was also the best, its callusing rate was 94%.
Comparison of adaptability of thirteen cultivars of coldseason turfgrass in spring and summer in Bengbu
Yuan-Bing ZHANG, Ai-Rong LIU, Xue-Beng ZHANG
2009, 3(4): 127-133.
[Abstract](1701) [PDF 1809KB](894)
The apparent quality and physiological indexes of 13 cultivars of coldseason turfgrass evaluated and measured. The results showed that the texture, tilling density, uniformity, coverage and leaf color of 13 cultivars were different. The apparent quality of Fescue Supreme, Pride, Houndog Ⅴ, Millennium, Homeland belonging to Festuca arundinacea were better, Ryeprince and Esquiro belonging to Lolium perenne grown better in spring than in summer. While Turf Star, Midnight, Total Eclipss, Award, Merit, Nuglade belonging to Poa pratensis performed very poor among the cultivars in spring and summer. As for physiological index, the root activity, soluble sugar content, chlorophyll content and proline content of Houndog Ⅴ, Pride, Millennium, Ryeprince Esquiro and Award were higher than other cultivars, but MDA contents of them was lower than others. The comprehensive analysis of apparent quality and physiological indexes indicated that Pride, Millennium and Houndog Ⅴwere the best, Ryeprince and Esquiro were better in spring than in summer, Turf Star, Midnight, Total Eclipss, Award, Merit and Nuglade were poor in spring and summer, in terms of adaptability.
Study on the plant regeneration of creeping bentgrass
TUN Xiang, Hui-Ling MA, Xiao-Jiang DIAO, Yun-Xia LI
2009, 3(4): 134-138.
[Abstract](1629) [PDF 1420KB](822)
The mature seeds of 3 cultivars of Agrostis stolonifera (PennA1,Seaside and Putter) were used as the explants to study the callus induction, differentiation and rooting. The results showed that the rate of callus induction of Putter was higher than PennA1 and Seaside on MS medium supplemented with different concentrations of 2,4D. MS medium supplemented with 2 mg/L 2,4D and 0.1 mg/L 6BA was the best callus induction medium for PennA1 and Seaside, meanwhile, MS medium supplemented with 3 mg/L 2,4D and 0.1 mg/L 6BA was the best for Putter. Callus inducement rates were 45.2%, 76.5% and 87.0% respectively. MSO medium was suitable for differentiation and the callus differentiation rates were 59.0%, 50.0% and 57.6% respectively. The optimum condition for rooting was 1/2 MS+1.0 mg/L IBA.
Study on the effect of coated controlledrelease urea on the growth of tall fescue
WU Liang, Xiu-Ju BIAN, Qiu-Meng XU, Jia-Lin GU
2009, 3(4): 139-143.
[Abstract](2006) [PDF 776KB](875)
The effect of coated controlledrelease urea on the growth of tall fescue (Festuca arundinacea) was studied in potted condition and two types of coated controlledrelease urea (U30 and U80, the release duration was 30 days and 80 days) were used. The results indicated that the turfgrass growing time was the shortest (only 51 days) treated with U80 and its content chlorophyll was higher than other treatments after 85 days growth. The aboveground biomass of turfgrass showed a pattern of increasing at the beginning and declining later. The underground biomass of turfgrass treated with U80 or U80 plus 30% of common urea was significantly higher than other treatments only with common urea (P0.05).
Effect of different soil moisture treatments on growth of turfgrass
Xiao-Lin ZHANG, Zhi-Gong BANG
2009, 3(4): 144-149.
[Abstract](1872) [PDF 812KB](902)
Five irrigation treatments, including full irrigation with reclaimed water, proper irrigation with reclaimed water, light water stress irrigation with reclaimed water, medium water stress irrigation with reclaimed water and severe water stress irrigation with reclaimed water were used to study the effect on turfgrass growth. Their irrigation start points were 80%, 70%, 60%, 50% and 40% of field capacity respectively and the irrigation amount for an irrigation event was same. The results showed that under the condition of precipitation higher than that in 50% hydrological years, it was benefit to turfgrass growth with high temperature, but the influence of irrigation quota on turfgrass growth was smaller. Under the condition of precipitation lower than that in 75% hydrological years, the response relationship between turfgrass growth and meteorological factors depended on irrigation quota, so proper irrigation was necessary for good qualify turf. The results based on path analysis showed that temperature was the main factor affecting the turfgrass growth under different water treatments in different hydrological years. On the other hand, once the precipitation was lower than that in 75% hydrological year, the turfgrass growth was promoted with high relative atmosphere humidity by regulating macroclimate.
Study on callus induction and plantlet regeneration of Ophiopogon japonicus
LI Jing, Ji-Xiong SUN, Hui-Min LIANG
2009, 3(4): 150-153.
[Abstract](1377) [PDF 605KB](838)
The differentiation of Ophiopogon japonicus callus from different explants with different medium was conducted. The result showed that the base part of young leaf was best for callus induction. and the induction rate was more than 89% in G3 medium (MS+KT 0.2 mg/L +2,4D 0.1 mg/L), and the differentiation rate could reach 59% in J1 medium (MS +BA 2.0 mg/L +NAA 0.2 mg/L).
Effect of water absorbent polymer on properties of soil substrate used on high and steep rocky slope
Gui-Juan GAO, Xiao-Long CENG
2009, 3(4): 154-158.
[Abstract](1359) [PDF 2536KB](835)
In order to improve the consolidation, permeability and organic nutrients of the soil substrate used on steep rocky slope, the properties of soil substrate added with cement, wood slashings, rice straw and peaty soil were studied. The results showed that the pH value and rigidity were increased and the maximum waterholding capacity of substrate decreased (P0.05) after the cement was added. However, the proportion of cement could be over 2% if the pH adjusting solution was used. The waterholding capacity was increased by adding wood slashings and peaty soil, meanwhile, the rigidity could be reduced (P0.05). The rice straw (2 mm in diameter) was not a proper additive material because it could make the substrate too loose and reduce the resistance to erosion. The maximum proportion of each additive component was determined as well.
Fu-Zhong ZHANG, Gui-Feng HOU
2009, 3(4): 159-160.
[Abstract](1689) [PDF 0KB](1606)