小麦残茬落叶的分解与土壤因子间动态关系的研究

The annual variation of wheat litter decomposition fluctuate as mono 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.

小麦残茬落叶的分解与土壤生物化学动态关系的研究

对高寒地区小麦残茬落叶在农田土壤的分解与土壤生物化学的动态关系进行了较系统的研究。结果表明：小麦残茬落叶分解的最大速率在７月（１２．１４×１０－３ｇ·ｇ－１·ｄ－１），呈单峰曲线变化。１４种土壤生物化学因素对小麦残茬落叶的分解和有机物质的转化既表现出明显的季节变化规律，又具有明显的阶段性作用特征。对小麦残茬落叶分解的灰色关联序为：ｘ１（０．９１４）＞ｘ４（０．８８０）＞ｘ３（０．８５５）＞ｘ１２（０．８５２） ＞ｘ１４（０．８０２）＞ｘ２（０．７９９）＝ｘ１１（０． ７９９）＞ ｘ８（０． ７８８）＞ ｘ１０（０．７７５） ＞ ｘ９（０． ７６０）＞ ｘ１３（０． ７０９）＞ ｘ５（０．７００）＞ ｘ７（０．６９４） ＞ ｘ６（０． ６５７），并选择性地建立了小麦残茬落叶分解的ＧＭ（０，６）灰色预测模型：ｙ（ｋ）＝１３．５ｘ１（ｋ）＋２３．７５ｘ４（ｋ）－１５．０ｘ３（ｋ）－１６．５ｘ１２（ｋ）－０．５ｘ１４（ｋ）＋５．０ｘ２（ｋ）－１．