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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Transpiration Dominates Ecosystem Water-Use Efficiency in Response to Warming in an Alpine Meadow
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Transpiration Dominates Ecosystem Water-Use Efficiency in Response to Warming in an Alpine Meadow

机译：蒸腾占据了生态系统的水利用效率，以回应在高山草地上的变暖

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摘要

As a key linkage of C and water cycles, water-use efficiency (WUE) quantifies how much water an ecosystem uses for carbon gain. Although ecosystem C and water fluxes have been intensively studied, yet it remains unclear how ecosystem WUE responds to climate warming and which processes dominate the response of WUE. To answer these questions, we examined canopy WUE (WUEc), ecosystem WUE (WUEe) and their components including gross ecosystem productivity, ecosystem evapotranspiration (ET), soil evaporation (E), and plant canopy transpiration (T), in response to warming in an alpine meadow by using a manipulative warming experiment in 2015 and 2016. As expected, low-and high-level warming treatments increased soil temperature (T_(soil)) at 10 cm on average by 1.65 and 2.77°C, but decreased soil moisture (M_(soil)) by 2.52 and 7.6 vol %, respectively, across the two years. Low-and high-level warming increased WUEe by 7.7 and 9.3% over the two years, but rarely changed WUEc in either year. T/ET ratio determined the differential responses of WUEc and WUEe. Larger T/ET led to less difference between WUEc and WUEe. By partitioning WUEc and WUEe into different carbon and water fluxes, we found that T rather than gross ecosystem productivity or E dominated the responses of WUEc and WUEe to warming. This study provides empirical insights into how ecosystem WUE responds to warming and illustrates the importance of plant transpiration in regulating ecosystem WUE under future climate change.
机译：为C和水循环的密钥连接，水分利用效率（WUE）量化多少水对碳增益的生态系统的用途。虽然生态系统碳水通量已被广泛研究，但目前还不清楚生态系统WUE响应气候变暖以及如何处理主宰WUE的响应。为了回答这些问题，我们研究了树冠WUE（WUEc），生态系统WUE（WUEe）及其组件，包括总生态系统生产力，生态系统蒸散（ET），土壤蒸发（E），和植物蒸腾（T），为应对气候变暖在通过使用在2015年和2016年作为一个操纵变暖实验的草甸预期的，低和高级别升温处理在10厘米平均1.65 2.77℃升高土壤温度（T_（土）），但降低了土壤水分（M_（土））通过分别2.52和7.6％（体积），横跨两年。低和高层次变暖增加WUEe超过两年7.7和9.3％，但在任何一年也难得改变WUEc。 T / ET比确定WUEc和WUEe的不同反应。较大的T / ET导致WUEc和WUEe之间差异较小。通过分割WUEc和WUEe成不同的碳和水通量，我们发现，T而不是总生态系统生产力或E为主变暖WUEc和WUEe的响应。这项研究提供实证见解生态系统如何响应WUE变暖和说明植物蒸腾的在未来气候变化调节生态系统WUE的重要性。

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    Quan Quan; Fangyue Zhang; Dashuan Tian; Qingping Zhou; Lixin Wang; Shuli Niu;

  • 作者单位

    Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing China;

    Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing China;

    Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing China;

    Institute of Qinghai-Tibetan Plateau Southwest University for Nationalities Chengdu China;

    Department of Earth Sciences Indiana University-Purdue University Indianapolis Indianapolis IN USA;

    Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生物分布与生物地理学;
  • 关键词

    Transpiration Dominates; Ecosystem Water-Use; Efficiency in;

    机译：蒸腾占主导地位;生态系统用水;效率;

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