中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Modelling the demand for new nitrogen fixation by terrestrial ecosystems

文献类型:期刊论文

作者Xu-Ri (Xu-Ri)1,2; Prentice, IC (Prentice, I. Colin)3; Xu-Ri
刊名BIOGEOSCIENCES
出版日期2017
卷号14期号:7页码:2003-2017
关键词NET PRIMARY PRODUCTIVITY CARBON SEQUESTRATION GLOBAL VEGETATION ELEVATED CO2 FOREST PRODUCTIVITY CLIMATE-CHANGE N-2 FIXATION SOIL PATTERNS DEPOSITION
DOI10.5194/bg-14-2003-2017
文献子类Article
英文摘要Continual input of reactive nitrogen (N) is required to support the natural turnover of N in terrestrial ecosystems. This "N demand" can be satisfied in various ways, including biological N fixation (BNF) (the dominant pathway under natural conditions), lightning-induced abiotic N fixation, N uptake from sedimentary substrates, and N deposition from natural and anthropogenic sources. We estimated the global new N fixation demand (NNF), i.e. the total new N input required to sustain net primary production (NPP) in non-agricultural terrestrial ecosystems regardless of its origin, using a N-enabled global dynamic vegetation model (DyNLPJ). DyN-LPJ does not explicitly simulate BNF; rather, it estimates total NNF using a mass balance criterion and assumes that this demand is met from one source or another. The model was run in steady state and then in transient mode driven by recent changes in CO2 concentration and climate. A range of values for key stoichiometric parameters was considered, based on recently published analyses. Modelled NPP and C : N ratios of litter and soil organic matter were consistent with independent estimates. Modelled geographic patterns of ecosystem NNF were similar to other analyses, but actual estimated values exceeded recent estimates of global BNF. The results were sensitive to a few key parameters: the fraction of litter carbon respired to CO2 during decomposition and plant-type-specific C : N ratios of litter and soil. The modelled annual NNF increased by about 15% during the course of the transient run, mainly due to increasing CO2 concentration. The model did not overestimate recent terrestrial carbon uptake, suggesting that the increase in NNF de-mand has so far been met. Rising CO2 is further increasing the NNF demand, while the future capacity of N sources to support this is unknown.
学科主题自然地理学
WOS研究方向Environmental Sciences & Ecology; Geology
语种英语
WOS记录号WOS:000399607500001
源URL[http://ir.itpcas.ac.cn/handle/131C11/8261]  
专题青藏高原研究所_图书馆
通讯作者Xu-Ri
作者单位1.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China.
2.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Alpine Ecol & Biodivers, Beijing 100101, Peoples R China.
3.Imperial Coll London, Dept Life Sci, AXA Chair Biosphere & Climate Impacts, Silwood Pk Campus,Buckhurst Rd, Ascot SL5 7PY, Berks, England.
推荐引用方式
GB/T 7714
Xu-Ri ,Prentice, IC ,Xu-Ri. Modelling the demand for new nitrogen fixation by terrestrial ecosystems[J]. BIOGEOSCIENCES,2017,14(7):2003-2017.
APA Xu-Ri ,Prentice, IC ,&Xu-Ri.(2017).Modelling the demand for new nitrogen fixation by terrestrial ecosystems.BIOGEOSCIENCES,14(7),2003-2017.
MLA Xu-Ri ,et al."Modelling the demand for new nitrogen fixation by terrestrial ecosystems".BIOGEOSCIENCES 14.7(2017):2003-2017.

入库方式: OAI收割

来源:青藏高原研究所

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