生态学杂志2024，Vol.43Issue(9)：2650-2657,8.DOI:10.13292/j.1000-4890.202409.036
杉木-火力楠混交林降低表层土壤细菌残体积累
Mixed Cunninghamia lanceolata-Michelia macclurei plantation decreased soil bacterial residue accumula-tion in topsoils
摘要
Abstract
Microbial residues are major contributors to soil organic carbon(SOC).However,their responses to mixed plantation forests remain unclear.In this study,we examined the accumulation of microbial residues in soil at depths of 0-20 cm in Cunninghamia lanceolata-Michelia macclurei mixed plantation and C.lanceolata pure planta-tion by analyzing amino sugars and using the ratio of Gram-positive to Gram-negative bacteria to determine the con-version coefficient of bacterial residues.The results showed that bacterial residues at depths of 0-10 cm were 25.3％lower in the mixed plantation than that in the monoculture,leading to SOC being 11％lower in the mixed planta-tion.The lower accumulation of bacterial residues in the mixed plantation was mainly due to the lower accumulation in macroaggregates.However,the accumulation of total microbial residues and their contribution to SOC did not dif-fer between the mixed plantation and monoculture.These results indicate that the M.macclurei and C.lanceolata mixed plantations after 35 years would reduce bacterial residues as well as soil carbon sequestration,which would be detrimental to the long-term maintenance of soil fertility.关键词
氨基糖/微生物残体/土壤碳/杉木/混交林Key words
amino sugar/microbial residue/Chinese fir/soil carbon/mixed plantation引用本文复制引用
井艳丽,王清奎..杉木-火力楠混交林降低表层土壤细菌残体积累[J].生态学杂志,2024,43(9):2650-2657,8.基金项目
杉木用材林定向培育技术研究子课题(2021YFD2201303-05)和国家自然科学基金项目(31901302)资助. （2021YFD2201303-05）
