Light Competition and Biodiversity Loss Cause Saturation Response of Aboveground Net Primary Productivity to Nitrogen Enrichment

doi:10.1029/2019JG005556

	Light Competition and Biodiversity Loss Cause Saturation Response of Aboveground Net Primary Productivity to Nitrogen Enrichment
	Ma, Fangfang 1,3; Song, Bing 1,3; Quan, Quan 1,3; Zhang, Fangyue 1,3; Wang, Jinsong 1; Zhou, Qingping 2; Niu, Shuli 1,3
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
	2020-03-01
卷号	125 期号:3 页码:12
关键词	Ammonium toxicity biodiversity loss ecosystem function light limitation N addition gradient soil acidification
ISSN号	2169-8953
DOI	10.1029/2019JG005556
通讯作者	Niu, Shuli(sniu@igsnrr.ac.cn)
英文摘要	The continually increasing nitrogen (N) deposition is expected to cause a saturation response of ecosystem aboveground net primary productivity (ANPP). However, its underlying mechanisms, especially for the decrease of ANPP under high N addition rate, remain poorly understood. A field manipulative experiment was conducted to investigate the response of ANPP to six levels of N addition rate (0, 2, 4, 8, 16, and 32 g N center dot m(-2)center dot year(-1)) in an alpine meadow during 2015-2017. We specifically explored four possible mechanisms, light limitation, biodiversity loss, soil acidification, and ammonium toxicity, underlying the saturation response of ANPP to increasing N addition. The results showed that ANPP increased linearly with N addition rates in 2015, while converted to a saturation response with N addition rates in 2016-2017. With increasing N addition rate, species richness and soil pH significantly reduced while standing litter, light limitation, and NH4+-N content significantly increased. Under low N addition rate (N0 to N4), increases in N availability significantly improved ANPP although it was partly offset by the indirect N effect via increasing litter accumulation and thus light competition. Under high N addition rate (N8-N32), the decreases in species richness mostly explained the N-induced reduction in ANPP, leading to a saturation response. This study provides empirical evidences on interpreting N saturation response of ANPP in the alpine meadow. The findings will advance our current understanding of N enrichment effects on ANPP and benefit biogeochemical models in parameterization and benchmark analysis.
资助项目	National Science Foundation of China[31625006] ; National Key R&D Program of China[2016YFC0501803] ; National Key R&D Program of China[2017YFA0604801]
WOS关键词	ECOSYSTEM CARBON FLUXES ; PLANT DIVERSITY ; SPECIES RICHNESS ; PHOSPHORUS ADDITIONS ; USE EFFICIENCY ; CLIMATE-CHANGE ; GRASSLAND ; DEPOSITION ; WATER ; ACIDIFICATION
WOS研究方向	Environmental Sciences & Ecology ; Geology
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000522353000003
资助机构	National Science Foundation of China ; National Key R&D Program of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/133265]
专题	中国科学院地理科学与资源研究所
通讯作者	Niu, Shuli
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China 2.Southwest Minzu Univ, Inst Qinghai Tibetan Plateau, Chengdu, Peoples R China 3.Univ Chinese Acad Sci, Dept Resources & Environm, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Ma, Fangfang,Song, Bing,Quan, Quan,et al. Light Competition and Biodiversity Loss Cause Saturation Response of Aboveground Net Primary Productivity to Nitrogen Enrichment[J]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2020,125(3):12.
APA	Ma, Fangfang.,Song, Bing.,Quan, Quan.,Zhang, Fangyue.,Wang, Jinsong.,...&Niu, Shuli.(2020).Light Competition and Biodiversity Loss Cause Saturation Response of Aboveground Net Primary Productivity to Nitrogen Enrichment.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,125(3),12.
MLA	Ma, Fangfang,et al."Light Competition and Biodiversity Loss Cause Saturation Response of Aboveground Net Primary Productivity to Nitrogen Enrichment".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 125.3(2020):12.