Climate Change Data Portal
| DOI | 10.1111/gcb.12873 |
| Change in terrestrial ecosystem water-use efficiency over the last three decades | |
| Huang, Mengtian; Piao, Shilong; Sun, Yan; Ciais, Philippe; Cheng, Lei; Mao, Jiafu; Poulter, Ben; Shi, Xiaoying; Zeng, Zhenzhong; Wang, Yingping | |
| 通讯作者 | Piao, SL (通讯作者) |
| 发表日期 | 2015 |
| ISSN | 1354-1013 |
| EISSN | 1365-2486 |
| 起始页码 | 2366 |
| 结束页码 | 2378 |
| 卷号 | 21期号:6 |
| 英文摘要 | Defined as the ratio between gross primary productivity (GPP) and evapotranspiration (ET), ecosystem-scale water-use efficiency (EWUE) is an indicator of the adjustment of vegetation photosynthesis to water loss. The processes controlling EWUE are complex and reflect both a slow evolution of plants and plant communities as well as fast adjustments of ecosystem functioning to changes of limiting resources. In this study, we investigated EWUE trends from 1982 to 2008 using data-driven models derived from satellite observations and process-oriented carbon cycle models. Our findings suggest positive EWUE trends of 0.0056, 0.0007 and 0.0001g Cm(-2)mm(-1)yr(-1) under the single effect of rising CO2 (CO2'), climate change (CLIM') and nitrogen deposition (NDEP'), respectively. Global patterns of EWUE trends under different scenarios suggest that (i) EWUE-CO2 shows global increases, (ii) EWUE-CLIM increases in mainly high latitudes and decreases at middle and low latitudes, (iii) EWUE-NDEP displays slight increasing trends except in west Siberia, eastern Europe, parts of North America and central Amazonia. The data-driven MTE model, however, shows a slight decline of EWUE during the same period (-0.0005g Cm(-2)mm(-1)yr(-1)), which differs from process-model (0.0064g Cm(-2)mm(-1)yr(-1)) simulations with all drivers taken into account. We attribute this discrepancy to the fact that the nonmodeled physiological effects of elevated CO2 reducing stomatal conductance and transpiration (TR) in the MTE model. Partial correlation analysis between EWUE and climate drivers shows similar responses to climatic variables with the data-driven model and the process-oriented models across different ecosystems. Change in water-use efficiency defined from transpiration-based WUEt (GPP/TR) and inherent water-use efficiency (IWUEt, GPPxVPD/TR) in response to rising CO2, climate change, and nitrogen deposition are also discussed. Our analyses will facilitate mechanistic understanding of the carbon-water interactions over terrestrial ecosystems under global change. |
| 关键词 | ATMOSPHERIC CARBON-DIOXIDEPAN EVAPORATION TRENDSNET PRIMARY PRODUCTIONDIFFERENCE VEGETATION INDEXELEVATED CO2 CONCENTRATIONDYNAMIC GLOBAL VEGETATIONFUTURE CLIMATE-CHANGELEAF-AREA INDEXSTOMATAL CONDUCTANCENITROGEN DEPOSITION |
| 英文关键词 | climate change; CO2 enrichment; nitrogen deposition; process-based model; remote-sensing; water-use efficiency |
| 语种 | 英语 |
| WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
| WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
| WOS记录号 | WOS:000353977500023 |
| 来源期刊 | GLOBAL CHANGE BIOLOGY
 |
| 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/258607 |
| 推荐引用方式 GB/T 7714 | Huang, Mengtian,Piao, Shilong,Sun, Yan,et al. Change in terrestrial ecosystem water-use efficiency over the last three decades[J]. 中国科学院青藏高原研究所,2015,21(6). |
| APA | Huang, Mengtian.,Piao, Shilong.,Sun, Yan.,Ciais, Philippe.,Cheng, Lei.,...&Wang, Yingping.(2015).Change in terrestrial ecosystem water-use efficiency over the last three decades.GLOBAL CHANGE BIOLOGY,21(6). |
| MLA | Huang, Mengtian,et al."Change in terrestrial ecosystem water-use efficiency over the last three decades".GLOBAL CHANGE BIOLOGY 21.6(2015). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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