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为探讨玉米秸秆分解对土壤微生物残留物积累和稳定化过程的影响,通过室内培养试验研究了玉米秸秆施入后土壤氨基糖的动态变化和粒级分布特征,利用氨基葡萄糖(Glu N)与胞壁酸(Mur A)含量的比值探讨了不同来源微生物残留物在土壤养分循环中的相对贡献。结果表明,秸秆添加有利于氨基糖在土壤中的积累,并且真菌残留物对土壤有机质积累的贡献逐渐增加。氨基糖在高有机质土壤中的积累数量显著高于低有机质土壤,但其相对增加比例低于后者。培养过程中氨基糖首先在砂粒中合成,然后由粗粒级向细粒级迁移,尤其在黑土中粉粒对氨基糖的固持能力显著高于低有机质含量的棕壤。土壤黏粒对氨基糖的保持能力最强,且细菌细胞壁残留物向黏粒中迁移的能力显著高于真菌。
In order to investigate the effect of corn stalk decomposition on the accumulation and stabilization of soil microbial residues, the dynamic changes of soil amino sugar and the characteristics of grain size distribution after corn stalk application were investigated through indoor culture experiments. Glu N and The ratio of Mur A content discussed the relative contribution of microbial residues from different origins in soil nutrient cycling. The results showed that straw addition was beneficial to the accumulation of amino sugars in soil, and the contribution of fungi residues to soil organic matter accumulation increased gradually. The accumulation of amino sugar in high organic matter soil was significantly higher than that in low organic matter soil, but its relative increase proportion was lower than the latter. Amino sugars were first synthesized in the sand during cultivation and then migrated from the coarse grain to the fine grain. In particular, the retention of the amino sugar by the grain in black soil was significantly higher than that of brown soil with low organic matter content. Soil clay had the strongest ability to retain amino sugar, and the ability of bacterial cell wall remnants to migrate into clay was significantly higher than that of fungi.