不同秸秆覆盖量免耕对土壤氨基糖积累的影响  

Accumulation of Amino Sugars Affected by Different Stalk Mulching Quantity in No-tillage System

作　　者：董智[1,2] 解宏图[2] 张立军[1] 白震[2] 武叶叶[2] 赵晓霞 张旭东[2,4] 

机构地区：[1]沈阳农业大学农学院,辽宁沈阳110866 [2]森林与土壤生态国家重点实验室中国科学院沈阳应用生态研究所,辽宁沈阳110164 [3]吉林省梨树县农业技术推广总站,吉林四平136500 [4]辽宁沈阳农田生态系统国家野外观测研究站,辽宁沈阳110016

出　　处：《土壤通报》2013年第5期1158-1162,共5页Chinese Journal of Soil Science

基　　金：国家自然科学基金(41171199);中国科学院战略性先导科技专项;应对气候变化的碳收支认证及相关问题(XDA05050501)

摘　　要：以吉林省梨树县中国科学院现代耕作技术研发基地黑土为研究对象，对不同秸秆覆盖量（0覆盖、33％秸秆覆盖、67％秸秆覆盖、100％秸秆覆盖）免耕耕层（0～20cm）氨基糖含量的变化特征进行了分析。结果表明，与无秸秆还田相比，不同量秸秆覆盖增加了表层（0～2cm）土壤氨基糖含量；不同微生物来源氨基糖对秸秆覆盖量的响应不同，其中氨基葡萄糖和氨基半乳糖表现出随秸秆覆盖量增加而增加的趋势，而胞壁酸仅在全秸秆覆盖下显著增加；秸秆覆盖还田免耕下真菌来源的氨基葡萄糖与细菌来源的胞壁酸的比值高于无秸秆还田免耕，表明连续秸秆覆盖还田土壤中真菌已逐渐转为优势群体，而真菌占优势的农田生态系统更利于土壤同碳。A no-tillage experiment with different corn stalk quantity （0, 33%, 67% and 100% stalk mulching） was set up in 2007 in Northeast of China. The changes of three kinds of microbes-derived amino sugars were determined in the plow layer （0 - 20 cm）. The results showed that stalk mulching promoted the accumulation of soil amino sugars in the top soil （0 - 2 cm） compared with no stalk mulching treatment. The amounts of amino sugars derived from different fungi and bacteria changed significantly under the stalk mulching, the amounts of glucosamine and galactosamine increased with stalk mulching quantity increased. While muramic acid was significantly increased only under 100% stalk mulching. Furthermore, the ratios of glucosamine to muramic acid in stalk mulching treatments were higher than that of no stalk mulching treatment. It suggests that the fungi play a dominant role in stalk mulching agroecosystems as the enrichment of fungal-derived glucosamine, thus leading to higher soil organic C storage in the soils.

关 键 词：免耕 秸秆覆盖还田 氨基糖 真菌 细菌 黑土 

分 类 号：S154.2[农业科学—土壤学]