干旱状况和叶子含水量之间的不稳定关系使得远程感测树木干旱压力变得复杂
Indra Boving1, Jean Allen2, Philip G Brodrick3
1Department of Ecology, Evolution, and Marine Biology, University of California Santa Barbara, Santa Barbara, California, USA.
Global change biology
|April 18, 2025
概括
遥感显示了监测植物干旱压力的潜力. 然而,在不同的时间和地点建立水含量和压力之间的一致关系是具有挑战性的.
科学领域:
- 生态生态学 生态生态学
- 植物生理学 植物生理学
- 遥感 遥感 遥感 遥感
背景情况:
- 遥感可以在生态系统层面进行植物干旱压力监测.
- 生理压力和遥感水分含量指标之间的联系仍然不确定.
研究的目的:
- 研究水位和含水量之间的关系的稳定性.
- 评估这些关系与diele,季节性和空间变化的xeric树物种.
- 将基于现场的关系与实验室校准方法进行比较.
主要方法:
- 在现场测量水潜力和含水量.
- 重复空中VSWIR成像以评估含水量.
- 分析跨日,季节和空间尺度的关系.
- 与基于实验室的干方法进行比较.
主要成果:
- 现场和遥感指标显示,干旱压力在空间和时间之间存在不一致的关系.
- 在生长季节测量时,与空间变化相比,水含量和压力之间的关系更强.
- 基于现场的季节性关系与实验室干方法相比,与空间比较更好.
结论:
- 混生理过程,如生长,会影响遥感指标的一致性.
- 遥感中的"空间换时间"方法对干旱压力评估有局限性.
- 高时间分辨率遥感有潜力检测干旱压力,如果解决局限性.
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