Spatially explicit assessment of global consumptive water uses in cropland: Green and blue water
Spatially explicit assessment of global consumptive water uses in cropland: Green and blue water
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DOI：
10.1016/j.jhydrol.2009.11.024
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发表时间：
2010-04-30
影响因子：
6.4
通讯作者：
Yang, Hong
中科院分区：
文献类型：
--
作者：
Liu, Junguo;Yang, Hong
以高空间分辨率准确估计全球用水量是评估全球水资源短缺和了解人类对生态系统干扰的关键。尽管以前取得了进展，但对农业中的绿色水和蓝色水的使用缺乏明确的空间评估。在本文中，我们估计消费性用水（CWU）在全球范围内的农田空间分辨率为30弧分。一个基于GIS的版本的EPIC模型，GEPIC，用于估计。结果表明，在作物生长期，2000年前后全球农田CWU为5938 km 3a-1，其中绿色水贡献率为84%。全球农田CWU为7323 km（3）a（-1），其中绿色水贡献了87%。我们比较了模拟消费性蓝水使用（CBWU）与统计CBWU在国家一级的个别国家，并在联邦州或省一级在美国和中国。比较表明，模拟和统计CBWU之间有很好的一致性，这表明一个令人满意的性能的GEPIC模型和可靠性的估计在灌溉农田。绿色水在作物生产和粮食贸易中的重要性要求除蓝水外，更好地管理绿色水。(C)2009爱思唯尔有限公司版权所有。
An accurate estimate of global water uses with high spatial resolution is a key to assessing global water scarcity and to understanding human's interference with the ecosystems. In spite of the progress made previously, there is a lack of spatially explicit assessment of both green and blue water uses in agriculture. In this paper, we estimated consumptive water use (CWU) in cropland on a global scale with a spatial resolution of 30 arc-minutes. A GIS-based version of the EPIC model, GEPIC, is used for the estimation. The results show that in crop growing periods, global CWU was 5938 km(3) a(-1) in cropland around the year 2000, of which green water contributed to 84%. On an annual basis, global CWU was 7323 km(3) a(-1) in cropland, of which green water contributed to 87%. We compared the simulated consumptive blue water use (CBWU) with the statistical CBWU at the national level among individual countries, and at the federal state or province level in the USA and China. The comparison indicates a good agreement between the simulated and statistical CBWU, suggesting a satisfactory performance of the GEPIC model and reliability of the estimation in irrigated cropland. The importance of green water in both crop production and food trade calls for a better management of green water, in addition to blue water. (C) 2009 Elsevier B.V. All rights reserved.