生理学和光谱反射率之间的机械联系使得树枯和干旱压力的预先检测成为可能
Gerard Sapes1,2, Lucy Schroeder3, Allison Scott1
1Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, MN 55108.
概括
早期检测树枯和树木干旱至关重要. 光谱学可以通过分析光谱反射来识别这些压力,在明显症状出现之前区分树枯和干旱.
科学领域:
- 林业林业 林业 林业 林业
- 植物病理学 植物病理学
- 遥感 遥感 遥感 遥感
背景情况:
- 全球变化推动了通过入侵性害虫和病原体的树木死亡率.
- 在美国,树生态系统在生态和经济上是至关重要的.
- 树的衰退和干旱和树枯 (Bretziella fagacearum) 的死亡需要监测.
研究的目的:
- 用光谱学来区分树枯和干旱压力.
- 在明显的症状出现之前检测这些压力.
- 为了能够及早监测树的健康状况.
主要方法:
- 综合解剖学和生态生理学测量与光谱学.
- 使用的叶子,树冠和空气中的光谱反射.
- 在干旱和/或树枯接种下对Quercus rubra树苗进行实验.
主要成果:
- 光谱反射率模型准确地预测了树枯和干旱的生态生理指标.
- 木枯会通过 tyloses 引起局部的树阻塞,与干旱的emboli 不同.
- 光谱检测到生理变化12天之前的视觉症状.
结论:
- 叶子光谱反射率模型有效预测与树枯和干旱相关的生态生理学变化.
- 光谱学可以早期检测和区分这些压力.
- 将光谱模型与空间数据集成,可以增强应力类型的差异化.
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