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首页> 外文期刊>Physics and chemistry of the earth >Long time-series spatiotemporal variations of NPP and water use efficiency in the lower Heihe River Basin with serious water scarcity
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Long time-series spatiotemporal variations of NPP and water use efficiency in the lower Heihe River Basin with serious water scarcity

机译：黑河下游流域NPP和水分利用效率的长时间序列时空变化，严重缺水

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It is of great significance to analyze the long time-series spatiotemporal dynamics of water use efficiency (WUE) to formulating appropriate management measures in response to the growing water scarcity in arid and semi-arid regions. This study analyzed the long time-series variations of WUE in the Lower Heihe River Basin, a typical arid and semi-arid region in China. The net primary productivity (NPP) was first estimated with the C-fix model, then WUE during 2001-2010 was calculated with the NPP and evapotranspiration (ET) data, and the accumulative WUE was further calculated. The results showed that the annual NPP and WUE in the study area ranged from zero to 448.70 gC/(m(2) a) and from zero to 2.20 gC kg(-1) H2O, respectively, both of which showed an overall increasing trend during 2001-2010. Besides, the spatial pattern of WUE kept overall unchanged during 2001-2010, but with remarkable change in some part of the study area. In addition, the accumulative WUE of the whole study area showed a first sharply decreasing and then gradually increasing trend, but there was still some scope to improve the WUE, and it is necessary to carry out some more specific policies to further improve the water allocation and WUE within the Lower Heihe River Basin. Although with some uncertainties, these results still can provide valuable reference information for improving the water resource management and ecological conservation to guarantee provision of essential ecosystem services in arid and semi-arid regions. (C) 2016 Elsevier Ltd. All rights reserved.
机译：分析水资源利用效率（WUE）的长时间序列时空动态，以针对干旱和半干旱地区日益严重的缺水情况制定适当的管理措施，具有重要意义。这项研究分析了中国典型的干旱和半干旱地区黑河下游流域WUE的长时间序列变化。首先使用C-fix模型估算净初级生产力（NPP），然后使用NPP和蒸散（ET）数据计算2001-2010年的WUE，然后进一步计算累积WUE。结果表明，研究区的年NPP和WUE分别为零至448.70 gC /（m（2）a）和零至2.20 gC kg（-1）H2O，两者均呈总体上升趋势在2001年至2010年期间。此外，WUE的空间格局在2001-2010年期间总体保持不变，但在研究区域的某些部分发生了显着变化。此外，整个研究区的累积用水量呈现出先急剧下降然后逐渐增加的趋势，但仍存在一定的改进余地，有必要采取一些更具体的政策来进一步改善用水量和黑河下游流域内的水利用效率。尽管存在一些不确定性，但这些结果仍可为改善水资源管理和生态保护，以确保在干旱和半干旱地区提供必要的生态系统服务提供有价值的参考信息。 （C）2016 Elsevier Ltd.保留所有权利。

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