Area-wide evapotranspiration monitoring at the crown level of a tropical mountain rain forest
Area-wide evapotranspiration monitoring at the crown level of a tropical mountain rain forest
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热带山地雨林树冠层的全区域蒸散监测
DOI：
10.1016/j.rse.2017.03.023
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发表时间：
2017
影响因子：
13.5
通讯作者：
J Bendix
中科院分区：
文献类型：
--
作者：
Silva B;Álava-Núñez P;Strobl S;Beck E;J Bendix
生态系统水分调节耦合能量和水分平衡，依赖于生态系统的完整性，并响应气候变化。在厄瓜多尔南部热带安第斯山脉生物多样性热点的树-水关系的变化可能会在个别树木的水平上观察到，从而提供了一个有效的生态系统监测方法，在森林管理和保护树木和景观水平上的应用。在这项研究中，我们结合联合收割机面积平均测量从激光蒸散仪以上的森林光学卫星数据在高空间分辨率，以获得区域范围内的蒸散数据。野外数据的处理包括计算森林生物量中的能量储存和将蒸散量划分为蒸腾和蒸发。通过使用塔通量测量值和大气潮湿和不太潮湿时期的气象数据，对卫星估算值进行校准。年蒸散量为1316 mm，其中1086 mm为研究点的森林蒸散量。当在单个树冠分析中应用高分辨率的区域范围蒸散量时，在潮湿和不太潮湿的大气条件下分别观察到每个树冠4.7和4.1 mm d− 1的平均值。大约24%的冠状病毒显示出积极的每月变化的ET，和51%的冠状病毒显示出显着的变化，每天ET，这可以被认为是敏感的个人有关水的关系。在树冠水平的区域范围内的蒸散量的限制，可以解释考虑冠个人的光谱响应。该方法可用于山地森林生态监测。
Ecosystem water regulation couples energy and water balance, depends on the integrity of the ecosystem, and responds to changes in climate. Changes in tree-water relationships in the biodiversity hotspot of the tropical Andes in southern Ecuador might be potentially observed at the level of individual trees, thus providing an efficient ecosystem monitoring method with applications in forest management and conservation at the tree and landscape levels. In this study, we combine area-average measurements from a laser scintillometer above the forest with optical satellite data at high spatial resolution to obtain area-wide evapotranspiration data. The processing of field data includes the calculation of energy storage in forest biomass and the partitioning of evapotranspiration into transpiration and evaporation. Satellite-based estimates are calibrated by using tower flux measurements and meteorological data within periods of humid and less-humid atmosphere. The annual evapotranspiration was 1316 mm, of which 1086 mm per year corresponds to the forest transpiration at the study site. Average values of 4.7 and 4.1 mm d− 1per tree crown are observed under humid and less-humid atmospheric conditions, respectively, when applying high-resolution area-wide evapotranspiration in individual crown analysis. Approximately 24% of the observed crowns show a positive monthly change in ET, and 51% of the crowns show a significant change in the daily ET, which can be considered sensitive individuals concerning water relationships. The limitations in the area-wide evapotranspiration at the crown level can be explained by considering the spectral responses of the crown individuals. The presented method can be robustly deployed in the ecological monitoring of mountain forests.
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