期刊
RESOURCES CONSERVATION AND RECYCLING
卷 173, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.resconrec.2021.105709
关键词
Spatial scale effects; Evapotranspiration; Wheat; Path analysis; green water; Blue water
资金
- National Key Research and Development Plan [2018YFF0215702]
- National Natural Science Foundation of China [51809215]
- West Light Talent Program of the Chinese Academy of Sciences
The study found that different spatial scales have significant impacts on the water footprint of crop production. Human management factors are the dominant drivers for large river basins, while meteorological factors play a key role at smaller spatial levels.
The water footprint of crop production (WFP) is among the most comprehensive agricultural water-consumption evaluation tools because it describes the amount, type, and location of water consumed. However, existing literatures on WFP quantification and evaluation are only aimed at a specific spatial level, and currently, there is a lack of quantitative research on the effects of different spatial levels on the variation in WFP. Herein, we calculated the spatial distribution of wheat WFPs in China from 2000 to 2014 at five different spatial levels: crop field, county, river sub-basin, provincial, and large river basin. In addition, we analysed and compared the key driving forces of wheat WFP at these spatial levels, focusing on meteorological and human management factors. Each spatial level had distinct spatial distributions. Human management factors demonstrated more significant effects on the WFP of large river basins, but the meteorological factors were the key drivers at smaller spatial levels. In conclusion, our study quantitatively revealed a non-negligible effect of spatial scale on WFP. Thus, for large river basins, agricultural water resource managers at each spatial level must clarify their different priorities across spatial levels while formulating water-saving and regulation measures.
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