小麦残茬落叶的分解与土壤因子间动态关系的研究

东北高寒地区的黑钙土土质优良肥沃 ,适合小麦、大豆和玉米等种植。近年来 ,由于人们只重视无机化肥的使用 ,忽视了地力培育 ,大量秸秆被移出田外 ,造成土壤有机质含量降低 ,土壤板结 ,使原本高产的农田逐渐变成中低产田 ,甚至有的已成为撂荒地。因此 ,研究当前农田土壤对枯枝落叶的分解现状 ,对于认识现有耕种条件下 ,农田土壤亚系统的物质转化和能量流动具有实际意义。1　研究地区和研究方法1 .1　自然概况该研究是在黑龙江省克山师专农场进行的。地理位置位于东经 1 2 5°8′～ 1 2 6°8′,北纬 47°50′～ 48°33′。年均气温 1 .3℃ ,1…

Study on Relationship Between Wheat Litter Decomposition and Soil Factors

he annual variation of wheat litter decomposition fluctuate asmono-curve,with biggest value in July.The seasonal variation of 6 enviroment factors are different from wheat litter decomposition in some degrees.The direct effect of microbial biomass，soil animal net number，soil water content and soil temperature on wheat litter decomposition is bigger than other factors.The indirect effect of microbial biomass→soil temperature，microbial biomass→soil water content，microbial biomass→soil animal net number,and soil temperature→animal net number，soil respiration rate→animal net number are more obvious than other ones.