Root litter diversity and functional identity regulate soil carbon and nitrogen cycling in a typical steppe

doi:10.1016/j.soilbio.2019.107688

	Root litter diversity and functional identity regulate soil carbon and nitrogen cycling in a typical steppe
	Man, Jing 1; Tang, Bo 1; Xing, Wen ; Wang, Yang ; Zhao, Xuezhen 1; Bai, Yongfei1
	2020
发表期刊	SOIL BIOLOGY & BIOCHEMISTRY
ISSN	0038-0717
卷号	141
摘要	Root litter decomposition is the dominant source of soil organic carbon (C) and nitrogen (N) in grasslands. Few studies, however, have explored the effect of root litter diversity on soil C and N cycling. This study investigated the effects of species diversity and functional traits of root litter on soil CO2 and N2O release, net ammonification, net nitrification, and net N mineralization based on a 56-day incubation of grassland soils with root litter mixtures containing one, two, or four native plant species. The increasing species richness of root litter decreased the cumulative CO2 and N2O release in the soil, but enhanced the net ammonification, nitrate immobilization, and N mineralization. Root litter diversity has a predominant non-additive antagonistic effect on the release of soil CO2 and N2O, and a synergistic effect on the net ammonification, nitrate immobilization, and N mineralization in the soil. The functional identity rather than functional diversity of root traits explains most of the variation in soil C and N cycling. A high C: N ratio and low concentrations of N, P, K, and Di-O-alkyl-C (characteristic of celluloses) were found to be key to the antagonistic effects associated with cumulative release of CO2 from the soil. For net N ammonification and mineralization, the synergistic effect was principally induced by the high levels of carbohydrate-C and N and the low C: N ratios in root litter mixtures. Our study highlights the role and mechanisms of increased root litter diversity in decreasing soil CO2 and N2O release and in increasing the net N mineralization via non-additive antagonistic and synergistic effects of dominant root traits.
关键词	Root litter diversity Soil C and N cycling Non-additive effect Root chemical traits Functional root traits Functional identity
学科领域	Soil Science
DOI	10.1016/j.soilbio.2019.107688
收录类别	SCI
语种	英语
WOS关键词	MICROBIAL BIOMASS CALIBRATION ; FUMIGATION-EXTRACTION METHOD ; SPECIES RICHNESS ; FINE ROOTS ; DECOMPOSITION DYNAMICS ; NONADDITIVE RESPONSES ; ECOSYSTEM PROCESSES ; PLANT DIVERSITY ; GLOBAL PATTERNS ; INNER-MONGOLIA
WOS研究方向	Agriculture
WOS记录号	WOS:000513986700020
出版者	PERGAMON-ELSEVIER SCIENCE LTD
文献子类	Article
出版地	OXFORD
资助机构	National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31630010, 31320103916]
作者邮箱	yfbai@ibcas.ac.cn
引用统计	被引频次：17[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/2S10CLM1/21900
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, 20 Nanxincun, Beijing 100093, Peoples R China 2.Univ Chinese Acad Sci, Coll Resources & Environm, 19A Yuquan Rd, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Man, Jing,Tang, Bo,Xing, Wen,et al. Root litter diversity and functional identity regulate soil carbon and nitrogen cycling in a typical steppe[J]. SOIL BIOLOGY & BIOCHEMISTRY,2020,141.
APA	Man, Jing,Tang, Bo,Xing, Wen,Wang, Yang,Zhao, Xuezhen,&Bai, Yongfei.(2020).Root litter diversity and functional identity regulate soil carbon and nitrogen cycling in a typical steppe.SOIL BIOLOGY & BIOCHEMISTRY,141.
MLA	Man, Jing,et al."Root litter diversity and functional identity regulate soil carbon and nitrogen cycling in a typical steppe".SOIL BIOLOGY & BIOCHEMISTRY 141(2020).

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