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Responses of terrestrial water cycle components to afforestation within and around the Yellow River basin

机译:黄河流域内外陆地水循环对造林的响应。

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TReforestation has attracted worldwide attention because of its multiple environmental benefits, but its impact on water resources is complicated and still controversial. In this study, the authors conducted numerical experiments within and around the Yellow River basin under the Grain-for-Green project using the Weather Research and Forecasting model. The results showed that the terrestrial water cycle process was sensitive to land use/cover change in the study region. Under the increase of mixed forests within and below the basin, the basin-averaged precipitation and evaporation increased by 223.17 and 223.88 mm respectively, but the surface runoff decreased by 2.22 mm from 2006 to 2010. In other words, the forest-induced increase in evaporation exceeded that of precipitation along with decreased surface runoff. Importantly, the afforestation effects on water resources seemed to enhance with time, and the effects of the same vegetation change were different in dry and wet years with different precipitation amounts (i.e. different atmospheric circulation background). It should be noted that it is difficult to obtain one product that can explicitly reflect the spatial distribution of actual land cover change promoted by the Grain-for-Green project in the Yellow River basin, which is an important obstacle to clearly identify the reforestation impacts. A land cover dataset derived from advantages of multiple sets of data therefore needs to be proposed.摘要退耕还林对水资源的影响复杂且尚存在争议,鉴于此本文基于WRF模式对黄河流域及周边的退耕还林进行了模拟研究,结果表明研究区域的陆地水循环要素对土地利用/覆盖变化较为敏感。在耕地转变为混交林的情况下,黄河流域面平均降水量在2006–2010年间增多223.17 mm,蒸发增加223.88 mm,而产流减少2.22 mm。随着时间增长,植被变化对水资源的影响逐渐增强。对于降水明显偏多和偏少的年份,同一植被变化对水循环要素影响的空间分布不同。
机译:植树造林由于其多重环境效益而引起了全世界的关注,但是它对水资源的影响却是复杂的,并且仍然存在争议。在这项研究中,作者使用“天气研究和预测”模型在“换粮计划”下的黄河流域及其周围地区进行了数值实验。结果表明,研究区域的陆地水循环过程对土地利用/覆盖变化敏感。在流域内和流域以下混交林增加的情况下,2006年至2010年流域平均降水量和蒸发量分别增加了223.17和223.88 mm,但地表径流减少了2.22 mm。蒸发量超过降水量,同时地表径流减少。重要的是,植树造林对水资源的影响似乎随着时间而增强,相同的植被变化对干旱和潮湿年份的降水量不同(即大气环流背景不同)的影响也不同。应当指出的是,很难获得一种能够明确反映黄河流域“绿色换粮”项目所推动的实际土地覆盖变化的空间分布的产品,这是清楚地识别造林影响的重要障碍。 。因此,需要提出一种从多套数据的优势中得出的土地覆盖数据集。在耕地转变为混交林的情况下,黄河流域面平均变化量在2006–2010年间增加223.17毫米,蒸发增加223.88毫米,而产生流减少2.22 mm。随着时间的增长,变化变化对长度的影响逐渐增强。对于明显偏多和偏少的年份,同时变化对水循环要素影响的空间分布不同。

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