Changes in the composition of soil microbial communities and their carbon‐cycle genes following the conversion of primary broadleaf forests to plantations and secondary forests

土壤碳 微生物种群生物学 碳循环 丰度(生态学) 固碳 固碳 生物 土壤微生物学 土壤肥力 农学 土壤水分 生态学 生态系统 二氧化碳 细菌 遗传学
作者
Xianzhen Luo,Dazhi Wen,Enqing Hou,Lingling Zhang,Yue Li,Xianjin He
出处
期刊:Land Degradation & Development [Wiley]
卷期号:33 (6): 974-985 被引量:12
标识
DOI:10.1002/ldr.4183
摘要

Abstract The soil organic carbon (C) cycle is primarily mediated by soil microorganisms and their genes that function in the C cycle (C‐cycle genes), both of which are strongly affected by land cover disturbance. However, the mechanism underlying microbially mediated soil C loss after conversion of primary natural broadleaf forests (BF) to plantation forests (PF) and secondary forests (SF) remains unknown. Here, we measured soil physicochemical properties and soil microbial community properties, and examined their linkages with microbial C‐cycle genes. Forest conversion dramatically decreased the richness of the soil fungal community but not of the bacterial community, and altered the composition of both communities. Analysis of C‐cycle genes revealed that the abundance of genes associated with C fixation, methane metabolism, and C degradation decreased by 51.3%, 57.9%, and 67.0%, respectively with the conversion of BF to PF; and by 6.3%, 4.1%, and 15.6%, respectively, with the conversion of BF to SF. The reductions in the abundance of C‐cycle genes, especially the reduction of hemicellulose‐ and lignin‐degradation genes, were primarily associated with the declines in the abundance of forest conversion‐sensitive microbes indexed by operational taxonomic units ( fsOTUs , = 0.41). fs OTUs were taxonomically diverse and included members frequently co‐occurring with numerous other microbes in the microbial communities, indicating that the manipulation of fs OTUs by forest management could improve soil fertility and soil C sequestration. Forest conversion‐induced shifts in fs OTUs abundance were associated with changes in soil potassium permanganate oxidizable organic carbon (PXC) concentration, dissolved organic carbon (DOC) concentration, and soil pH. Our results indicate that alterations in soil substrate supply (e.g., DOC and PXC) and soil pH induced by forest conversion may strongly shape fs OTUs structure and decrease the abundance of hemicellulose and lignin degradation genes, and consequently increase C loss.
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