论文部分内容阅读
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(0~20 cm)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(0~2 cm)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固碳。
Taking black soil of modern farming technology research base of Chinese Academy of Sciences in Lishu, Jilin Province as the research object, the effects of different tillage treatments (0 ~ 20, 0%, 0% and 20% straw mulching) cm) amino sugar content changes were analyzed. The results showed that different amounts of straw mulching increased the content of amino sugar in the surface layer (0 ~ 2 cm) compared with no-straw returning. The response of different sugar sources to the amount of straw mulching was different, among which glucosamine and galactosamine But increased with the increase of straw mulching rate, while mimic acid increased only under the coverage of the whole straw; the ratio of fungal-derived glucosamine to bacterial-derived mural acid was significantly higher than straw-free No-tillage showed that the fungi in the continuous straw mulching field had gradually turned into dominant groups, and the fungal dominant farmland ecosystem was more conducive to soil carbon sequestration.