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| 作者 | Yiping Zhang
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| 刊名 | New Phytologist
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| 出版日期 | 2013
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| 卷号 | 200期号:2页码:330-339 |
| 关键词 | carbon compensation point
carbon limitation
drought
high temperature
whole-plant chamber
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| 中文摘要 |
Summary
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Theoretically, progressive drought can force trees into negative carbon (C) balance by reducing stomatal conductance to prevent water loss, which also decreases C assimilation. At higher temperatures, negative C balance should be initiated at higher soil moisture because of increased respiratory demand and earlier stomatal closure. Few data are available on how these theoretical relationships integrate over the whole plant.
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We exposed Thuja occidentalis to progressive drought under three temperature conditions (15, 25, and 35°C), and measured C and water fluxes using a whole-tree chamber design.
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High transpiration rates at higher temperatures led to a rapid decline in soil moisture. During the progressive drought, soil moisture-driven changes in photosynthesis had a greater impact on the whole-plant C balance than respiration. The soil moisture content at which whole-plant C balance became negative increased with temperature, mainly as a result of higher respiration rates and an earlier onset of stomatal closure under a warmer condition.
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Our results suggest that the effect of drought on whole-plant C balance is highly temperature-dependent. High temperature causes a negative C balance even under mild drought and may increase the risk of C starvation.
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| 公开日期 | 2013-09-22
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| 源URL | [http://ir.xtbg.org.cn/handle/353005/4678]  |
| 专题 | 西双版纳热带植物园_全球变化研究组
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推荐引用方式
GB/T 7714 |
Yiping Zhang. High temperature causes negative whole-plant carbon balance under mild drought[J]. New Phytologist,2013,200(2):330-339.
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| APA |
Yiping Zhang.(2013).High temperature causes negative whole-plant carbon balance under mild drought.New Phytologist,200(2),330-339.
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| MLA |
Yiping Zhang."High temperature causes negative whole-plant carbon balance under mild drought".New Phytologist 200.2(2013):330-339.
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