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| DOI | 10.5194/bg-14-2003-2017 |
| Modelling the demand for new nitrogen fixation by terrestrial ecosystems | |
| Xu-Ri; Prentice, I. Colin | |
| 通讯作者 | Xu-Ri (通讯作者) |
| 发表日期 | 2017 |
| ISSN | 1726-4170 |
| EISSN | 1726-4189 |
| 起始页码 | 2003 |
| 结束页码 | 2017 |
| 卷号 | 14期号:7 |
| 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. |
| 关键词 | NET PRIMARY PRODUCTIVITYGLOBAL VEGETATIONCARBON SEQUESTRATIONFOREST PRODUCTIVITYN-2 FIXATIONSOILCO2PATTERNSDEPOSITIONRESPONSES |
| 语种 | 英语 |
| WOS研究方向 | Environmental Sciences & Ecology ; Geology |
| WOS类目 | Ecology ; Geosciences, Multidisciplinary |
| WOS记录号 | WOS:000399607500001 |
| 来源期刊 | BIOGEOSCIENCES
 |
| 来源机构 | 中国科学院青藏高原研究所 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/258952 |
| 推荐引用方式 GB/T 7714 | Xu-Ri,Prentice, I. Colin. Modelling the demand for new nitrogen fixation by terrestrial ecosystems[J]. 中国科学院青藏高原研究所,2017,14(7). |
| APA | Xu-Ri,&Prentice, I. Colin.(2017).Modelling the demand for new nitrogen fixation by terrestrial ecosystems.BIOGEOSCIENCES,14(7). |
| MLA | Xu-Ri,et al."Modelling the demand for new nitrogen fixation by terrestrial ecosystems".BIOGEOSCIENCES 14.7(2017). |
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