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首页> 外文期刊>The New Phytologist >Leaf- and stand-level responses of a forested mesocosm to independent manipulations of temperature and vapor pressure deficit.
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Leaf- and stand-level responses of a forested mesocosm to independent manipulations of temperature and vapor pressure deficit.

机译：森林中的中观对温度和蒸气压不足的独立操纵的叶面和立面响应。

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摘要

Alterations in temperature (T) and vapor pressure deficit (VPD) strongly influence gas exchange, but because VPD is highly influenced by T, the effects of these two factors are difficult to separate. Here, the concomitant effects of T and VPD on CO2 uptake, stomatal conductance, and transpiration at leaf- and canopy-levels were examined for a stand of trees (Populus deltoides) enclosed within large mesocosms. T and VPD were independently altered to yield a factorial combination of treatments of low (24 degrees C) or high (30 degrees C) T and low (0.75) or high (1.75 kPa) VPD. Traditional leaf-level gas exchange measurements were compared with whole-canopy exchange to verify typical scaling methods. Elevated T resulted in an average 40% and 14% increase in midday leaf-level and canopy-level net CO2 uptake, respectively. Other physiological responses to elevated T and VPD were similar at both scales, but the magnitude of change was usually less pronounced at the canopy-level. Surprisingly, only minimal interactions between T and VPD were found to influence responses of CO2 uptake and stomatal conductance at either level..
机译：温度（T）和蒸汽压差（VPD）的变化会强烈影响气体交换，但是由于VPD受T的影响很大，因此很难区分这两个因素的影响。在这里，对于封闭在大中观空间中的一排树木（Populus deltoides），研究了T和VPD对CO2吸收，气孔导度和叶和冠层水平蒸腾的伴随影响。分别更改T和VPD以产生低（24摄氏度）或高（30摄氏度）T和低（0.75）或高（1.75 kPa）VPD治疗的因子组合。将传统的叶面气体交换测量与全冠层交换进行比较，以验证典型的缩放方法。升高的T分别使中午叶片水平和冠层水平的净CO2吸收量分别平均增加40％和14％。在两个尺度上，其他对T和VPD升高的生理反应相似，但在冠层水平上变化幅度通常较不明显。令人惊讶的是，在任何一个水平上，仅发现T和VPD之间的最小相互作用会影响CO2吸收和气孔导度的响应。

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