Tree roots exert greater influence on soil microbial necromass carbon than above-ground litter in subtropical natural and plantation forests
Tree roots exert greater influence on soil microbial necromass carbon than above-ground litter in subtropical natural and plantation forests
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在亚热带天然林和人工林中，树根对土壤微生物死物质碳的影响大于地上枯落物
DOI：
10.1016/j.soilbio.2022.108811
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发表时间：
2022-08
影响因子：
9.7
通讯作者：
Yusheng Yang
中科院分区：
文献类型：
--
作者：
Shuxian Jia;Xiaofei Liu;Weisheng Lin;Xiaojie Li;Liuming Yang;Siyi Sun;Dafeng Hui;Jianfen Guo;Xiaoming Zou;Yusheng Yang
The stabilization of soil organic carbon (SOC) relies heavily on both the production of microbial necromass carbon (MNC) and its protection by clay minerals. Above- and below-ground carbon (C) sources differ not only in the C quality and quantity that drive MNC production but also in MNC-mineral interactions. Here we test the hypothesis that root litter and exudates play a more important role in the formation and stabilization of soil MNC than above-ground litterfall in a natural subtropical moist forest and a tree ( Castanopsis carlesii ) plantation of southeastern China. We employed a two-factorial design of field experiment consisting of four treatments: control (CT), litterfall exclusion (NL), root exclusion (NR), and no C input (NI). We found that NR treatment substantially reduced total soil MNC and both bacterial (BNC) and fungal (FNC) necromass C as well as fractions of MNC and FNC to total SOC in both natural and plantation forests, but did not alter ratios of FNC to BNC or BNC to total SOC. In comparison, NL treatment had no effect on the ratios of MNC, FNC or BNC to total SOC in both forests. Furthermore, NR treatment reduced both bacterial and fungal biomass, but NL treatment had no significant effect on bacterial or fungal biomass in the natural forests. Whereas the NR and NI treatments significantly reduced MNC and FNC in both forests, the NL treatment reduced MNC and FNC only in the natural forest and reduced BNC only in the plantation forest. Analysis of structural equation model revealed that the C treatments could alter the accumulation of MNC directly or indirectly through changing soil available substrates (i.e., DOC, NH 4 + ) and microbial community structure. Our data suggests that plant roots exert a stronger influence on the production and stabilization of MNC than above-ground C source. • Soil microbial necromass C is primarily controlled by below-ground C input. • Fungal necromass C responds sensitively to litter and root C exclusions. • Root C exclusion reduces the proportion of microbial and fungal necromass C to SOC. • Natural forests produce greater amount of microbial and fungal necromass C than plantation forests.
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影响因子：
11.4
作者：
A. Simpson;M. Simpson;E. Smith;B. Kelleher
通讯作者：
A. Simpson;M. Simpson;E. Smith;B. Kelleher
中国亚热带地区天然常绿阔叶林的转变减少了土壤有机碳，但增加了微生物残留的相对贡献
影响因子：
2.9
作者：
Yang Liuming;Chen Silu;Li Yan;Wang Quancheng;Zhong Xiaojian;Yang Zhijie;Lin Chengfang;Yang Yusheng
通讯作者：
Yang Yusheng
影响因子：
5.2
作者：
Hu, Ang;Nie, Yanxia;Zhang, Gengxin
通讯作者：
Zhang, Gengxin
影响因子：
3
作者：
Yusheng Yang;Guangshui Chen;P. Lin;Jinsheng Xie;Jianfen Guo
通讯作者：
Yusheng Yang;Guangshui Chen;P. Lin;Jinsheng Xie;Jianfen Guo
影响因子：
18.3
作者：
N. Sokol;M. Bradford
通讯作者：
N. Sokol;M. Bradford