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Global pattern and drivers of nitrogen saturation threshold of grassland productivity
Peng, Yunfeng; Chen, Han Y. H.; Yang, Yuanhe2
2020
Source PublicationFUNCTIONAL ECOLOGY
ISSN0269-8463
Volume34Issue:9Pages:1979-1990
AbstractEcosystem 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.
Keywordecosystem productivity ecosystem threshold nitrogen enrichment nitrogen saturation theory tipping point
Subject AreaEcology
DOI10.1111/1365-2435.13622
Indexed BySCI
Language英语
WOS KeywordGREENHOUSE-GAS EMISSIONS ; ECOSYSTEM CARBON FLUXES ; TERRESTRIAL ECOSYSTEMS ; FERTILIZER APPLICATION ; NONLINEAR RESPONSES ; FOREST ECOSYSTEMS ; BIODIVERSITY LOSS ; OXIDE EMISSIONS ; DAIRY PASTURES ; YIELD RESPONSE
WOS Research AreaEnvironmental Sciences & Ecology
WOS IDWOS:000548401100001
PublisherWILEY
SubtypeArticle
Publication PlaceHOBOKEN
EISSN1365-2435
Funding OrganizationNational 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]
Corresponding Author Emailyhyang@ibcas.ac.cn
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ibcas.ac.cn/handle/2S10CLM1/21677
Collection植被与环境变化国家重点实验室
Affiliation1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China
2.Chen, Han Y. H.] Lakehead Univ, Fac Nat Resources Management, Thunder Bay, ON, Canada
3.Univ Chinese Acad Sci, Beijing, Peoples R China
Recommended Citation
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.
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