Soil enzyme activity and stoichiometry along a gradient of vegetation restoration at the Karst Critical Zone Observatory in Southwest China

doi:10.1002/ldr.3389

	Soil enzyme activity and stoichiometry along a gradient of vegetation restoration at the Karst Critical Zone Observatory in Southwest China
	Guo, Zhiming 1,2; Zhang, Xinyu 1,2; Green, Sophie M.3; Dungait, Jennifer A. J.3,4; Wen, Xuefa 1,2; Quine, Timothy A.3
刊名	LAND DEGRADATION & DEVELOPMENT
	2019-10-01
卷号	30 期号:16 页码:1916-1927
关键词	enzyme activity karst ecosystem nitrogen phosphorus soil organic carbon vegetation restoration
ISSN号	1085-3278
DOI	10.1002/ldr.3389
通讯作者	Zhang, Xinyu(zhangxy@igsnrr.ac.cn)
英文摘要	The "Grain for Green Programme" was implemented in the 1990s as a solution to the extreme degradation of karst landscapes that cover one-third of China, largely caused by decades of poorly managed intensive agriculture. The recovery of soil functions is key to the success of ecosystem regeneration of abandoned croplands where the carbon (C) and nutrient cycles have been severely perturbed by cultivation. However, an ecological 'tipping point' beyond which soil functions are unrecoverable in manageable timescales may have been passed in the fragile, subtropical karst ecosystem. The aim of this study was to use the activity of key enzymes for C, nitrogen (N), and phosphorus (P) acquisition in the soil as a proxy for the biological response to vegetation restoration after agricultural abandonment in a severely degraded karst catchment at the Karst Critical Zone Observatory in Guizhou Province. In 2016, a space-for-time approach was used to establish a chronosequence of vegetation recovery: sloping cropland < recently abandoned sloping cropland < shrubland < secondary (regenerated) forest < primary (natural) forest. Soils were sampled from the surface to the bedrock (up to 80-cm depth) in each recovery phase. The activity of all enzymes in the top 0 to 30-cm depth increased after abandonment and was positively correlated with soil nutrient and water contents. Nitrogen deficiencies were indicated by the reduced ratios of C- relative to N-hydrolase activity and the increased ratios of N- relative to P-hydrolase activity in the abandoned croplands and shrublands. Phosphorus deficiencies were indicated by the reduced ratios of N- relative to P-hydrolase activity and C- relative to P-hydrolase activity in the soils of the shrubland and secondary forest compared with the primary forest. Our results revealed that near-to-natural biological soil function was recoverable as vegetation naturally restored and suggested that the rate of recovery may be accelerated by managed nutrient amendments during the early stages after abandonment. This new information may help to inform the managed regeneration of degraded agricultural land in nutrient-poor, subtropical environments.
WOS关键词	ORGANIC-MATTER DECOMPOSITION ; COMMUNITY STRUCTURE ; ECOENZYMATIC STOICHIOMETRY ; MICROBIAL COMMUNITIES ; BIOLOGICAL-PROPERTIES ; NUTRIENT ACQUISITION ; LOESS PLATEAU ; CARBON ; FOREST ; DEPTH
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
语种	英语
出版者	WILEY
WOS记录号	WOS:000491489100003
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/131898]
专题	中国科学院地理科学与资源研究所
通讯作者	Zhang, Xinyu
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.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China 3.Univ Exeter, Dept Geog, Coll Life & Environm Sci, Exeter EX4 4RJ, Devon, England 4.Rothamsted Res, Sustainable Agr Sci, North Wyke EX20 2SB, Okehampton, England
推荐引用方式 GB/T 7714	Guo, Zhiming,Zhang, Xinyu,Green, Sophie M.,et al. Soil enzyme activity and stoichiometry along a gradient of vegetation restoration at the Karst Critical Zone Observatory in Southwest China[J]. LAND DEGRADATION & DEVELOPMENT,2019,30(16):1916-1927.
APA	Guo, Zhiming,Zhang, Xinyu,Green, Sophie M.,Dungait, Jennifer A. J.,Wen, Xuefa,&Quine, Timothy A..(2019).Soil enzyme activity and stoichiometry along a gradient of vegetation restoration at the Karst Critical Zone Observatory in Southwest China.LAND DEGRADATION & DEVELOPMENT,30(16),1916-1927.
MLA	Guo, Zhiming,et al."Soil enzyme activity and stoichiometry along a gradient of vegetation restoration at the Karst Critical Zone Observatory in Southwest China".LAND DEGRADATION & DEVELOPMENT 30.16(2019):1916-1927.