Global pattern and drivers of nitrogen saturation threshold of grassland productivity

doi:10.1111/1365-2435.13622

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	Global pattern and drivers of nitrogen saturation threshold of grassland productivity
	Peng, Yunfeng ; Chen, Han Y. H.; Yang, Yuanhe 1
刊名	FUNCTIONAL ECOLOGY
	2020
卷号	34 期号:9 页码:1979-1990
关键词	ecosystem productivity ecosystem threshold nitrogen enrichment nitrogen saturation theory tipping point
ISSN号	0269-8463
DOI	10.1111/1365-2435.13622
文献子类	Article
英文摘要	Ecosystem productivity usually exhibits first increase and then saturated response to increasing nitrogen (N) additions, yet the broad-scale pattern and potential drivers of the N saturation threshold are little investigated. By synthesizing N addition experiments with at least four N-input levels from the global grasslands, we applied the quadratic-plus-plateau model to fit the above-ground net primary productivity (ANPP)-N rate relationship, and estimated the saturation threshold for N rate (critical N rate,N-CR) and ANPP (maximum ANPP, ANPP(max)) from the inflection point where ANPP no longer statistically increased with N rate for individual experiments. Based on these estimations, we investigated the spatial pattern and driving factors ofN(CR)and ANPP(max). The meanN(CR)and ANPP(max)were 15.0 and 477.0 g m(-2) year(-1), respectively, but varied substantially among single-site experiments. Management strategies (e.g. biomass harvest, different N forms and addition frequencies) minimally influenced both parameters. Structural equation models demonstrated that the spatial differences inN(CR)and ANPP(max)were mainly explained by aridity index, and soil carbon (C)/N ratio also predicted the variation inN(CR). Given that grasslands are important not only for the trend and variability of the land C sink but also for the maintenance of pasture yield, the pattern and controls ofN(CR)and ANPP(max), as revealed by the current study, are crucial for constructing robust predictions of C sink capacity and improving N fertilizer management in grasslands.
学科主题	Ecology
电子版国际标准刊号	1365-2435
出版地	HOBOKEN
WOS关键词	GREENHOUSE-GAS EMISSIONS ; ECOSYSTEM CARBON FLUXES ; TERRESTRIAL ECOSYSTEMS ; FERTILIZER APPLICATION ; NONLINEAR RESPONSES ; FOREST ECOSYSTEMS ; BIODIVERSITY LOSS ; OXIDE EMISSIONS ; DAIRY PASTURES ; YIELD RESPONSE
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	WILEY
WOS记录号	WOS:000548401100001
资助机构	National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31770521, 31825006, 31988102] ; Second Tibetan Plateau Scientific Expedition and Research (STEP) [2019QZKK0106, 2019QZKK0302] ; Youth Innovation Promotion Association CAS [2018106]
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/21677]
专题	植被与环境变化国家重点实验室
作者单位	1.Chen, Han Y. H.] Lakehead Univ, Fac Nat Resources Management, Thunder Bay, ON, Canada 2.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China 3.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Peng, Yunfeng,Chen, Han Y. H.,Yang, Yuanhe. Global pattern and drivers of nitrogen saturation threshold of grassland productivity[J]. FUNCTIONAL ECOLOGY,2020,34(9):1979-1990.
APA	Peng, Yunfeng,Chen, Han Y. H.,&Yang, Yuanhe.(2020).Global pattern and drivers of nitrogen saturation threshold of grassland productivity.FUNCTIONAL ECOLOGY,34(9),1979-1990.
MLA	Peng, Yunfeng,et al."Global pattern and drivers of nitrogen saturation threshold of grassland productivity".FUNCTIONAL ECOLOGY 34.9(2020):1979-1990.