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树种只解释了植物水敏感性解释的空间变异性的一半

Alexandra G Konings¹, Krishna Rao^1,2, Erica L McCormick¹

¹Department of Earth System Science, Stanford University, Stanford, California, USA.

Global change biology

|July 15, 2024

概括

占主导地位的树种很少解释区域植物水应激差异. 气候和地形等环境因素比单独的物种更有影响力,以了解植物水敏感性 (PWS).

科学领域:

生态水文学生态水文学
植物生理学植物生理学
遥感遥感遥感遥感

背景情况:

植物吸收,损失和储存水的过程极大地影响了光合作用和蒸发.
传统上,在植物对水应激反应中研究物种特征 (口腔关闭,树叶导电性,根特征).
生态水利学因素,如土壤液压,水的再分配,气候适应和植被密度,也起着重要的作用.

研究的目的:

为了确定占主导地位的树种在区域木质植物对水压力的反应中的相对重要性.
绘制植物水敏感度 (PWS) 的地图,并评估影响它的因素.

主要方法:

通过自动回归模型使用远程传感的活燃料含水量和水文气象数据开发了植物水敏度 (PWS) 地图.
分析了美国森林服务局在美国西部的21,455个森林库存和分析地块,其中有已知的主导物种.
采用随机森林模型,包括植被密度,气候,土壤特性和地形.

主要成果:

一个特定物种的PWS平均值只解释了PWS变化的23%.
环境因素 (植被密度,气候,土壤,地形) 使用随机森林模型解释了43%的PWS变化.
主导物种占PWS可解释变化的53%,突显了环境背景的影响力更大.

结论:

环境因素显著影响木质植物的水应激反应,往往超过主导物种的身份.
未来关于水压力物种间差异的研究应考虑到收集数据的特定环境条件.
平均气候和正常化差异植被指数 (NDVI) 也对PWS产生了重大影响.

关键词:

跨特异性变异性的跨特异性变化.内部特异性变异性的变化.活燃料的水分含量是什么植物的液压特征植物的液压特征植物与水的相互作用水的压力是水压力.

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