期刊
TREE PHYSIOLOGY
卷 24, 期 5, 页码 561-569出版社
HERON PUBLISHING
DOI: 10.1093/treephys/24.5.561
关键词
drought; longleaf pine; soil water; stomatal conductance; water potential
类别
We studied the response of stomatal conductance at leaf (g(S)) and canopy (G(S)) scales to increasing vapor pressure deficit (D) in mature Pinus palustris Mill. (longleaf pine) growing in a sandhill habitat in the coastal plain of the southeastern USA. Specifically, we determined if variation in the stomatal response to D was related to variation in hydraulic conductance along the soil-to-leaf pathway (K-L) over the course of a growing season. Reductions in K-L were associated with a severe growing season drought that significantly reduced soil water content (0) in the upper 90-cm soil profile. Although K-L recovered partially following the drought, it never reached pre-drought values. Stomatal sensitivity to D was well correlated with maximum g(S) at low D at both leaf and canopy scales, and K-L appeared to influence this response by controlling maximum g(S). Our results are consistent with the hypothesis that stomatal response to D occurs to regulate minimum leaf water potential, and that the sensitivity of this response is related to changes in whole-plant hydraulics.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据