西藏中部地区退化土壤秸秆还田的微生物变化特征及其影响

Microbial characteristics of straw-amended degraded soils in central Tibet and its effect on soil fertility.

于西藏中部地区秸秆还田条件下 ,研究了土壤微生物区系及其主要生理类群的变化特征和土壤微生物对土壤肥力的影响及其相互关系 .结果表明 ,不同秸秆还田方式 ,特别是秸秆覆盖和高茬方式较高的土壤水分、土壤温度及其耦合效应 ,为土壤微生物繁殖与活动提供了重要的土壤环境保障 ,有助于以细菌为主导的各类土壤微生物的相对均衡生长 ,对加速土壤有机残体分解 ,大幅度提高土壤有机质含量 ,促进土壤团粒结构形成和土壤养分转化均具重要作用 ,表明在西藏中部生态条件下 。

This paper studied the dynamics of microbial communities in degraded soils of central Tibet under straw amendment and its effect on soil fertility.The results showed that straw amendment,and soil covering with spring highland barley (Hordeum vulgare var.nudum) straw in particular,could supply a beneficial soil environment for the relatively balanced growth of soil microbes,e.g.,reduced water evaporation,appropriate temperature,and increased content of organic matter and nutrients.All the results demonstrated the possibility of straw amendment in recovering soil fertility and in reconstructing of soil structure in a relatively short period.