Dynamics between soil microorganism and soil character actors during Carthamus tinctorius growth periods

An experiment was conducted to determine the soil microbial community structure and the relationship between soil microbial community and soil environment factors of Carthamus tinctorius field. The results of this study showed that the total number of microorganism showed as elongation stageseed maturity stagerosette stageflorescence stage. The fungi and actinomycete number increased from rosette stage to elongation stage, and the bacteria and fungi number significantly decreased from elongation stage to florescence stage (P0.01), but increased from florescence stage to seed maturity stage. The Principal Component Analysis (PCA) with correlation analyses results showed that available phosphorus (AP) and electricity conductance (EC) together affected the growth of soil microbe community in the rosette stage, and available nitrogen (AN), AP, available potassium (AK) were the key factors impacting the number of soil microbes in elongation stage; the main factors affecting the growth of soil microbes were organic matter (OM), soil moisture (SM), and pH in the seed maturity stage. The Actinomycetes number was negatively related to OM and AP. This study suggested that the number of soil microbes varied with soil physicochemical property during the growth process of C. tinctorius.