土壤2025，Vol.57Issue(5)：1043-1052,10.DOI:10.13758/j.cnki.tr.2025.05.011
不同生物质炭施用量下烤烟根际土壤微生物残体碳变化特征
Changes in Microbial Residue Carbon in Tobacco Rhizosphere Soil Under Different Biochar Application Rates
摘要
Abstract
The flue-cured tobacco variety K326 was used as the material,a one-year experiment was conducted based on a long-term field trial with 5 years of C and R.Four biochar application rates were set:B0(0 kg/hm2),B1(300 kg/hm2),B2(750 kg/hm2),and B3(1 500 kg/hm2).The effects of the four biochar treatments on the accumulation of soil microbial residue carbon under the two cropping systems were compared.Results showed that under C,compared to C-B0,C-B1,C-B2 and C-B3 significantly increased soil amino sugar and residue carbon contents(P<0.05)by 13.26%,24.22%,36.20%,and 10.53%,20.23%,32.89%,respectively.However,there was no significant difference in the contribution of microbial residue carbon to organic carbon among different treatments.Under R,compared to R-B0,soil amino sugar,microbial residue carbon,and the contribution of microbial residue carbon to organic carbon all increased first and then decreased with increasing biochar application rate,with the maximum values under R-B1.Furthermore,under B0 and B1,the values of amino sugar,microbial residue carbon,and the contribution of microbial residue carbon to organic carbon were significantly higher under R than under C(P<0.05).Conversely,under B2 and B3,the contents of amino sugar and microbial residue carbon were significantly higher under C than under R(P<0.05).Mantel test and RDA analysis indicated that soil organic carbon was the primary factor influencing amino sugar and microbial residue carbon contents under C.In conclusion,R combined with biochar application is an effective approach to regulating the stability of soil-tobacco-microbial ecosystem,which can effectively mitigate continuous cropping obstacles in tobacco cultivation and achieving sustainable tobacco production.关键词
烤烟/种植模式/土壤有机碳/氨基糖/微生物残体碳Key words
Tobacco/Cropping systems/Soil organic carbon/Amino sugars/Microbial residue carbon分类
农业科技引用本文复制引用
杨雄伟,黄晓霞,崔仕方,金浩,张军刚,刘彦中,罗以贵..不同生物质炭施用量下烤烟根际土壤微生物残体碳变化特征[J].土壤,2025,57(5):1043-1052,10.基金项目
云南省烟草公司科技计划重点项目(2020530000241023)资助. （2020530000241023）
