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首页> 外文期刊>The Science of the Total Environment >The spatial and temporal evolution of the actual evapotranspiration based on the remote sensing method in the Loess Plateau
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The spatial and temporal evolution of the actual evapotranspiration based on the remote sensing method in the Loess Plateau

机译：黄土高原地区实际蒸散量的时空演变

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摘要

Due to the joint impact of climate change and human activities, vegetation cover area in Loess Plateau has been tremendously improved. However, vegetation restoration will lead to high water use, which might pose a great threat to the water sustainability of regional ecosystems. In order to analyze the spatiotem-poral characteristics of water consumption, this study estimated the actual evapotranspiration (AET) based on the SEBAL model. The study found that precipitation and AET increased significantly (5% confidence level) with the rising of vegetation coverage in the period of 1990-2015. The increase rate of precipitation was 1.91 mm/a, higher than that of AET (1.68 mm/a). From a spatial perspective, the AET of Loess Plateau is increasing from northwest to southeast. The high-AET area (AET > 400 mm) was also extremely enlarged from 39% (1990) to 73% (2015) with the vegetation recovery. In terms of the intra-annual variability, the AET from March to April is usually much higher than the precipitation in different hydrological years, which suggests that the spring drought is a potential threat for vegetation growth in Loess Plateau. At last, this study introduced an index of rainwater utilization potential indicator (IRUP) to analyze the water supply and demand in Loess Plateau. It found that IRUP values are positively correlated with NDVI (Normalized Difference Vegetation Index), indicating that the available water for vegetation growth is seemingly increasing with the vegetation cover area enlarged in the whole region.
机译：由于气候变化和人类活动的共同影响，黄土高原的植被覆盖面积得到了极大的改善。然而，植被恢复将导致大量用水，这可能对区域生态系统的水可持续性构成巨大威胁。为了分析耗水的时空特征，本研究基于SEBAL模型估算了实际蒸散量（AET）。研究发现，在1990年至2015年期间，降水和AET随植被覆盖率的增加而显着增加（置信度为5％）。降水增加速率为1.91 mm / a，高于AET（1.68 mm / a）。从空间角度看，黄土高原的AET从西北到东南逐渐增加。随着植被的恢复，高AET面积（AET> 400 mm）也从39％（1990）扩大到73％（2015）。就年内变化而言，3月至4月的AET通常高于不同水文年的降水量，这表明春季干旱是黄土高原植被生长的潜在威胁。最后，本研究引入了雨水利用潜力指标指数（IRUP）来分析黄土高原地区的供需状况。研究发现，IRUP值与NDVI（归一化植被指数）呈正相关，表明随着整个区域植被覆盖面积的增加，用于植被生长的可用水似乎在增加。

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