Plants in water-controlled ecosystems: active role in hydrologic processes and response to water stress: III. Vegetation water stress
Plants in water-controlled ecosystems: active role in hydrologic processes and response to water stress: III. Vegetation water stress
复制标题
DOI：
10.1016/s0309-1708(01)00006-9
复制
发表时间：
2001-07
影响因子：
4.7
通讯作者：
A. Porporato;F. Laio;L. Ridolfi;I. Rodríguez‐Iturbe
中科院分区：
文献类型：
--
作者：
A. Porporato;F. Laio;L. Ridolfi;I. Rodríguez‐Iturbe
干旱期间土壤含水量的减少降低了植物的水势，减少了蒸腾作用;这反过来又导致细胞膨压和相对含水量的减少，从而导致一系列日益严重的损害。植物生理学和水分胁迫的文献综述表明，植被水分胁迫可以假设开始在土壤水分水平对应于气孔关闭初期，并达到最大强度的萎蔫点。对于第二部分（F）中描述的土壤水分动力学随机模型，这些对水分胁迫至关重要的土壤水分水平的平均交叉特性是通过解析推导出来的。Laio，A.佩尼亚托湖里多尔菲岛罗德里格斯-伊图尔贝。24（7）（2001）707-723）。这些属性，然后提出了一种措施，结合平均强度，持续时间和频率的土壤水分亏缺时期的植被水分胁迫。然后研究了不同气候条件下植被水分胁迫的特征，表明植物，土壤和环境之间的相互作用如何导致植被的最佳条件。
The reduction of soil moisture content during droughts lowers the plant water potential and decreases transpiration; this in turn causes a reduction of cell turgor and relative water content which brings about a sequence of damages of increasing seriousness. A review of the literature on plant physiology and water stress shows that vegetation water stress can be assumed to start at the soil moisture level corresponding to incipient stomatal closure and reach a maximum intensity at the wilting point. The mean crossing properties of these soil moisture levels crucial for water stress are derived analytically for the stochastic model of soil moisture dynamics described in Part II (F. Laio, A. Porporato, L. Ridolfi, I. Rodriguez-Iturbe. Adv. Water Res. 24 (7) (2001) 707–723). These properties are then used to propose a measure of vegetation water stress which combines the mean intensity, duration, and frequency of periods of soil water deficit. The characteristics of vegetation water stress are then studied under different climatic conditions, showing how the interplay between plant, soil, and environment can lead to optimal conditions for vegetation.