Decomposition of leaf mixtures and absorptive-root mixtures synchronously changes with deposition of nitrogen and phosphorus

doi:10.1016/j.soilbio.2019.107602

	Decomposition of leaf mixtures and absorptive-root mixtures synchronously changes with deposition of nitrogen and phosphorus
	Lei Jiang 2,4; Liang Kou 1,2,3,4; Li Shenggong 2,4
刊名	SOIL BIOLOGY & BIOCHEMISTRY
	2019-11-01
卷号	138 页码:11
关键词	Mixing effect Litter decomposition Fertilization Nitrogen Phosphorus Synergistic interaction
ISSN号	0038-0717
DOI	10.1016/j.soilbio.2019.107602
通讯作者	Liang Kou(koul@igsnrr.ac.cn) ; Li Shenggong(lisg@igsnrr.ac.cn)
英文摘要	Leaves and absorptive roots, the plant tissues that acquire resources, decompose quite differently due to their distinct morphology, chemistry, and decomposition microenvironments. Root litters of different species often decompose in mixtures in natural forests or mixed plantations, similar to leaf litters. However, the mechanisms behind leaf mixture decomposition and root mixture decomposition and their responses to nutrient deposition remain poorly understood. We used a nutrient-addition manipulative experiment to investigate the individual and interactive effects of nitrogen (N) and phosphorus (P) on leaf mixture decomposition and absorptive-root mixture decomposition of Pinus massoniana and Schima superba forests in subtropical China. Four treatments were employed: control (CTRL), +N (120 kg N ha(-1) y(-1)), +P (40 kg P ha(-1) y(-1)), and +NP (120 kg N and 40 kg P ha(-1)y(-1)). Both the leaves and roots of P. massoniana and S. superba decomposed faster when in mixtures (observed) than in isolation (expected) under all treatments. The synergistic effects were decreased with +N and +NP relative to the CTRL for the leaf mixtures, but only with +NP for the root mixtures. The differences (observed-expected) of the extracellular enzymatic activities (EEAs) of microorganisms were decreased with +N in the leaf mixtures relative to the CTRL, and the differences (observed - expected) of acid unhydrolyzable residue (AUR) loss were decreased with +NP in the root mixtures. The differences (observed - expected) of mass loss were positively correlated with microbial EEAs differences for the leaf mixtures and with AUR loss difference for the root mixtures. Our results indicate that the decomposition of both the leaf mixtures and the root mixtures had synergistic effects. The decreased synergistic interactions under nutrient addition were associated with microbial EEAs for the leaf mixtures and with AUR loss for the root mixtures. These findings highlight the contrasting mechanisms underlying the decomposition of above-ground mixtures and below-ground mixtures, and imply a slow cycling of carbon and nutrients under atmospheric nutrient deposition.
资助项目	National Natural Science Foundation of China[41830646] ; National Natural Science Foundation of China[31570443] ; National Natural Science Foundation of China[31700379] ; National Key Research and Development Program of China[2016YFD0600202]
WOS关键词	LITTER DECOMPOSITION ; PLANT LITTER ; FINE ROOTS ; ECOENZYMATIC STOICHIOMETRY ; SPECIES-DIVERSITY ; PINE PLANTATION ; ORGANIC-MATTER ; SOIL ; CARBON ; FOREST
WOS研究方向	Agriculture
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000495519900021
资助机构	National Natural Science Foundation of China ; National Key Research and Development Program of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/131789]
专题	中国科学院地理科学与资源研究所
通讯作者	Liang Kou; Li Shenggong
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Qianyanzhou Ecol Stn, Beijing 100101, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China 3.Chinese Acad Sci, Ctr Forest Ecosyst Studies, Beijing 100101, Peoples R China 4.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Lei Jiang,Liang Kou,Li Shenggong. Decomposition of leaf mixtures and absorptive-root mixtures synchronously changes with deposition of nitrogen and phosphorus[J]. SOIL BIOLOGY & BIOCHEMISTRY,2019,138:11.
APA	Lei Jiang,Liang Kou,&Li Shenggong.(2019).Decomposition of leaf mixtures and absorptive-root mixtures synchronously changes with deposition of nitrogen and phosphorus.SOIL BIOLOGY & BIOCHEMISTRY,138,11.
MLA	Lei Jiang,et al."Decomposition of leaf mixtures and absorptive-root mixtures synchronously changes with deposition of nitrogen and phosphorus".SOIL BIOLOGY & BIOCHEMISTRY 138(2019):11.