| Modelling the demand for new nitrogen fixation by terrestrial ecosystems | |
| Xu-Ri (Xu-Ri)1,2; Prentice, IC (Prentice, I. Colin)3; Xu-Ri | |
| Source Publication | BIOGEOSCIENCES
 |
| 2017 | |
| Volume | 14Issue:7Pages:2003-2017 |
| DOI | 10.5194/bg-14-2003-2017 |
| Abstract | 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. |
| Subject Area | 自然地理学 |
| WOS ID | WOS:000399607500001 |
| Language | 英语 |
| Indexed By | SCI |
| Keyword | NET PRIMARY PRODUCTIVITY CARBON SEQUESTRATION GLOBAL VEGETATION ELEVATED CO2 FOREST PRODUCTIVITY CLIMATE-CHANGE N-2 FIXATION SOIL PATTERNS DEPOSITION |
| WOS Research Area | Environmental Sciences & Ecology; Geology |
| WOS Subject | Ecology; Geosciences, Multidisciplinary ; Environmental Sciences & Ecology; Geology |
| Cooperation Status | 国际 |
| Subtype | Article |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.itpcas.ac.cn/handle/131C11/8261 |
| Collection | 图书馆 |
| Corresponding Author | Xu-Ri |
| Affiliation | 1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Alpine Ecol & Biodivers, Beijing 100101, Peoples R China. 2.CAS Ctr Excellence Tibetan Plateau Earth Sci, 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. |
| Recommended Citation 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. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| V.14(7) 2003-2017 20（3086KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment