| Study on temporal and spatial changes of grey water footprints of main crops in Shaanxi Province |
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| DOI：10.7606/j.issn.1000-7601.2021.05.27 |
| Key Words: grey water footprint crops temporal and spatial changes non\|point source pollution Shaanxi Province |
| Author Name | Affiliation | | JIANG Xuhai | College of Land Engineering, Chang’an University, Xi'an, Shaanxi 710064, China | | HAN Ling | College of Land Engineering, Chang’an University, Xi'an, Shaanxi 710064, China | | Li Fan | College of Land Engineering, Chang’an University, Xi'an, Shaanxi 710064, China |
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| Abstract: |
| In order to explore the impact of agricultural production on water resources, taking Shaanxi Province as an example, using the grey water footprint theory, the temporal and spatial trends and distribution of grey water footprints of main crops in Shaanxi Province from 2000 to 2018 were studied and analyzed. The results showed that the average gray water footprints of wheat, corn, oil crops, soybeans, vegetables, and fruits were 0.472, 0.231, 0.639, 0.532, 0.087, 0.199 m3·kg-1, respectively. During the study period, the inter\|annual variation of crop production gray water footprint showed a downward trend as a whole, and the downward trend was about 0.007, 0.015, 0.009, 0.012 m3·kg-1·a-1. The inter\|annual changes of corn and vegetables were not obvious, and they were mainly concentrated in the Guanzhong Plain area. During the study period, the changes in crop gray water footprint were mainly indirectly affected by crop planting area. The average gray water footprints of wheat, corn, oil crops, soybeans, vegetables, and fruits were 18.6×108, 11.8×108, 3.1×108, 1.6×108, 9.7×108, 19.2×108m3·kg-1, and the annual average value of the gray water footprint of crops in the province was 64.0×108m3·kg-1. Finally, it is proposed that the gray water footprint can be reduced from the selection of fertilization types, fertilization methods, and crop planting modes, so as to reduce agricultural non\|point source pollution. |
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