Alterations of early-stage decomposition of leaves and absorptive roots by deposition of nitrogen and phosphorus have contrasting mechanisms

doi:10.1016/j.soilbio.2018.09.037

	Alterations of early-stage decomposition of leaves and absorptive roots by deposition of nitrogen and phosphorus have contrasting mechanisms
	Jiang, Lei 1,4; Kou, Liang 1,2,3; Li, Shenggong 1,4
刊名	SOIL BIOLOGY & BIOCHEMISTRY
	2018-12-01
卷号	127 页码:213-222
关键词	Litter decomposition Nutrient deposition AUR Phosphorus limitation Nitrogen addition Microbial enzymatic activity
ISSN号	0038-0717
DOI	10.1016/j.soilbio.2018.09.037
通讯作者	Kou, Liang(koul@igsnrr.ac.cn) ; Li, Shenggong(lisg@igsnrr.ac.cn)
英文摘要	Nitrogen (N) deposition may inhibit decomposition by decreasing microbial growth and activity (microbial mechanism) and/or increasing the binding of inorganic N ions to the acid-unhydrolyzable residue (AUR) in decomposing litter (chemical mechanism). How increased phosphorus (P) deposition affects decomposition and mediates the effect of N on this process, however, remains unclear. We used a nutrient-manipulative experiment to examine the individual and interactive effects of N and P on the decomposition of two fast-cycling organs (leaves vs. absorptive roots) in Pinus massoniana and Schima superba forests in subtropical China. The carbon fractions and microbial enzymatic activities in decomposing leaves and roots were also determined to identify the underlying mechanisms. Adding only N negatively affected the decomposition of absorptive roots but had no or a positive effect on foliar decomposition. Adding only P increased foliar decomposition but did not affect root decomposition. Adding both N and P had little effect on decomposition, except for a positive effect on P. massoniana leaves. The nutrient additions did not affect the amount of carbon remaining in the leaves, and adding only N increased the residual AUR content in the roots. Adding only P decreased the activity of acid phosphatase (AP) in the leaves. Foliar decomposition was correlated with microbial enzymatic activity but not AUR content. Root decomposition was correlated more strongly with AUR content than microbial enzymatic activity. The increased decomposition but decreased AP activity of the leaves with P addition suggests a stronger P limitation on the decomposition of leaves than roots in these subtropical forests. The stimulating effect of P on foliar decomposition may be due to a microbial mechanism, and a chemical mechanism may dominate the inhibitory effect of Non root decomposition. Our findings facilitate the mechanistic understanding of the effects of nutrient deposition on the decomposition of leaves and absorptive roots, and highlight the role of P deposition in mediating the effect of N on decomposition.
资助项目	National Key Research and Development Program of China[2016YFD0600202] ; National Natural Science Foundation of China[41830646] ; National Natural Science Foundation of China[31570443] ; National Natural Science Foundation of China[31700379]
WOS关键词	ORGANIC-MATTER DECOMPOSITION ; ACID-UNHYDROLYZABLE RESIDUE ; LITTER DECOMPOSITION ; NUTRIENT LIMITATION ; LEAF-LITTER ; ECOENZYMATIC STOICHIOMETRY ; TERRESTRIAL ECOSYSTEMS ; CONIFEROUS PLANTATION ; ATMOSPHERIC NITROGEN ; CARBON LIMITATION
WOS研究方向	Agriculture
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000449895600023
资助机构	National Key Research and Development Program of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/52516]
专题	中国科学院地理科学与资源研究所
通讯作者	Kou, Liang; Li, Shenggong
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China 2.Chinese Acad Sci, Ctr Forest Ecosyst Studies, Beijing 100101, Peoples R China 3.Chinese Acad Sci, Qianyanzhou Ecol Stn, Key Lab Ecosyst Network Observat & Modeling, Inst Geog Sci & Nat Resources Res, 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	Jiang, Lei,Kou, Liang,Li, Shenggong. Alterations of early-stage decomposition of leaves and absorptive roots by deposition of nitrogen and phosphorus have contrasting mechanisms[J]. SOIL BIOLOGY & BIOCHEMISTRY,2018,127:213-222.
APA	Jiang, Lei,Kou, Liang,&Li, Shenggong.(2018).Alterations of early-stage decomposition of leaves and absorptive roots by deposition of nitrogen and phosphorus have contrasting mechanisms.SOIL BIOLOGY & BIOCHEMISTRY,127,213-222.
MLA	Jiang, Lei,et al."Alterations of early-stage decomposition of leaves and absorptive roots by deposition of nitrogen and phosphorus have contrasting mechanisms".SOIL BIOLOGY & BIOCHEMISTRY 127(2018):213-222.