Soil organic carbon sourcing variance in the rhizosphere vs. non-rhizosphere of two mycorrhizal tree species

doi:10.1016/j.soilbio.2022.108884

	Soil organic carbon sourcing variance in the rhizosphere vs. non-rhizosphere of two mycorrhizal tree species
	Jia, Yufu ; Liu, Zongguang 1; Zhou, Lei 1; Liu, Xiaojuan ; Ma, Keping1 ; Feng, Xiaojuan1
	2023
发表期刊	SOIL BIOLOGY & BIOCHEMISTRY
ISSN	0038-0717
卷号	176
摘要	Soil organic carbon (SOC) plays a central role in ecosystem carbon sequestration and climate change mitigation, and its stability and dynamics are related to sourcing from microbial vs. plant residues. However, SOC sourcing and its regulating mechanisms remain poorly understood in soil's most bioactive compartment, the rhizosphere, which may differ from non-rhizosphere and under different mycorrhizal tree species. To fill the knowledge gap, here we collect the rhizosphere and non-rhizosphere soils under an arbuscular mycorrhizal (AM; Castanopsis eyrie) vs. an ectomycorrhizal (ECM) tree species (Pinus massoniana) of varied tree diameters (i.e., ages) in the Gutianshan subtropical forest of China. Plant and microbial residual components are quantified by lignin phenols and amino sugars, respectively. Coupled with the measurements of soil, microbial community and plant litter properties, we assess potential mechanisms (i.e., saprotrophic bacteria competition, microbial necromass recycling/reuse, and substrate quality control) influencing the distribution of plant and microbial residues in the rhizosphere vs. non-rhizosphere. We show that lignin phenols are more concentrated in rhizosphere than nonrhizosphere SOC, especially under the ECM trees showing inhibited saprotrophic decomposition induced by competition between ECM fungi and (saprophytic) bacteria. Amino sugars are also more concentrated in the rhizosphere of ECM trees due to ECM fungal contribution, but not under AM trees exhibiting reduced fungal necromass stability partially reflected by low biomass-normalized necromass accumulation coefficients in the rhizosphere. As a result, ratios of amino sugars to lignin phenols are relatively lower in the rhizosphere than nonrhizosphere under AM tree, challenging the presumed microbial dominance in rhizosphere carbon accumulation. These results highlight differences in and controls on rhizosphere SOC sourcing related to different mycorrhizal tree species, providing new information on the mechanisms regulating soil carbon dynamics in root-soil systems.
关键词	Soil organic carbon Rhizosphere Mycorrhizal fungi Saprotrophic bacteria competition Microbial necromass Lignin phenol
学科领域	Soil Science
DOI	10.1016/j.soilbio.2022.108884
收录类别	SCI
语种	英语
WOS关键词	SUBSTRATE AVAILABILITY ; ARBUSCULAR MYCORRHIZAL ; LITTER DECOMPOSITION ; COMMUNITY STRUCTURE ; LIGNIN OXIDATION ; PLANT LITTER ; MURAMIC ACID ; AMINO-SUGARS ; FINE ROOTS ; MATTER
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000903761400010
出版者	PERGAMON-ELSEVIER SCIENCE LTD
文献子类	Article
出版地	OXFORD
EISSN	1879-3428
资助机构	National Natural Science Founda- tion of China ; Chinese Academy of Sciences Interdisciplinary Innovation Team ; [42025303] ; [42273076] ; [31988102] ; [41807329] ; [JCTD- 2018-06]
作者邮箱	xfeng@ibcas.ac.cn
引用统计	被引频次：10[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/29139
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Jia, Yufu,Liu, Zongguang,Zhou, Lei,et al. Soil organic carbon sourcing variance in the rhizosphere vs. non-rhizosphere of two mycorrhizal tree species[J]. SOIL BIOLOGY & BIOCHEMISTRY,2023,176.
APA	Jia, Yufu,Liu, Zongguang,Zhou, Lei,Liu, Xiaojuan,Ma, Keping,&Feng, Xiaojuan.(2023).Soil organic carbon sourcing variance in the rhizosphere vs. non-rhizosphere of two mycorrhizal tree species.SOIL BIOLOGY & BIOCHEMISTRY,176.
MLA	Jia, Yufu,et al."Soil organic carbon sourcing variance in the rhizosphere vs. non-rhizosphere of two mycorrhizal tree species".SOIL BIOLOGY & BIOCHEMISTRY 176(2023).

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