Decades of reforestation significantly change microbial necromass, glomalin, and their contributions to soil organic carbon

格洛马林 重新造林 土壤碳 林地 环境科学 固碳 土壤质量 土壤有机质 农学 总有机碳 环境化学 林业 农林复合经营 土壤科学 化学 生态学 土壤水分 生物 地理 氮气 有机化学 细菌 遗传学 共生 丛枝菌根
作者
Mengling Zhang,Rongxiao Che,Zhibao Cheng,Hongkai Zhao,Chengwei Wu,Jinming Hu,Song Zhang,Dong Liu,Xiaoyong Cui,Yibo Wu
出处
期刊:Agriculture, Ecosystems & Environment [Elsevier BV]
卷期号:346: 108362-108362 被引量:30
标识
DOI:10.1016/j.agee.2023.108362
摘要

Microbial necromass carbon (MNC) and glomalin-related soil protein (GRSP) are stable microbe-derived sources of carbon (C) in soils. MNC constitutes a considerable portion of soil organic carbon (SOC). GRSP is beneficial for soil aggregation, quality improvement, and C storage. However, the impact of land use transitions from croplands to forests on MNC, GRSP, and their contributions to SOC are not fully understood. To illuminate these unclear dynamics, soil was collected at depths of 0–10 cm from 30 pairs of adjacent corn fields and woodlands in southwest China. These woodlands, mainly consisting of fir, pine, and rubber, were converted from croplands approximately two decades ago. Soil properties, SOC, MNC, and GRSP content were determined. We found that SOC content increased significantly by 23.24% following reforestation. Additionally, the MNC and total GRSP contents were 46.01% and 20.48% higher, respectively, in woodland soils than in adjacent cropland soils. The contribution of MNC to the SOC pools also significantly increased and their quantities were proportional to the increasing contribution of GRSP to SOC. In woodlands, soil NH4+-N content is the major factor regulating the accumulation of MNC. For cropland systems, the easily extractable GRSP showed a strong positive correlation with MNC accumulation. Overall, our findings show that reforestation from croplands is conducive to soil C sequestration. The positive relationship between the contributions of GRSP and MNC to SOC provides valuable information in terms of enhancing our understanding of mechanisms underlying the maintenance of soil C stocks through microbe-derived C.
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