| Title: | Effects of crop planting structure adjustment on water use efficiency in the irrigation area of Hei River Basin |
| Authors: | Han, X., Z. Wei, B. Zhang, C. Han and J. Song |
| Year: | 2018 |
| Journal: | Water |
| Volume (Issue): | 10(10) |
| Pages: | |
| Article ID: | 1305 |
| DOI: | 10.3390/w10101305 |
| URL (non-DOI journals): | |
| Model: | SWAT |
| Broad Application Category: | hydrologic only |
| Primary Application Category: | blue, green and/or gray water, or crop water productivity |
| Secondary Application Category: | evapotranspiration assessment |
| Watershed Description: | 1,922 km^2 Yingke Irrigation District, a tributary of the Hei River located in northwest China. |
| Calibration Summary: | |
| Validation Summary: | |
| General Comments: | |
| Abstract: | The adjustment of crop planting structure can change the process of water and material
circulation, and thus affect the total amount of water and evapotranspiration in the irrigation district.
To guide the allocation of water resources in the region, it is beneficial to ascertain the effects
of changing the crop planting structure on water saving and farmland water productivity in the
irrigation district. This paper takes Yingke Irrigation District as the background. According to the
continuous observation data from 2012 to 2013, Based on the modified Soil and Water Assessment
Tool (SWAT) model and taking advantage of monthly scale remote sensing EvapoTranspiration
(ET) and crop growth parameters (leaf area index and shoot dry matter), we tested the simulation
accuracy of the model, proposed irrigation efficiency calculation methods considering water drainage,
and established the scenario analysis method for the spatial distribution of crop planting structure.
Finally, we evaluated the changes in water savings in irrigation district projects and resources,
the irrigation water productivity and the net income water productivity under different planting
structure scenarios. The results indicate that the efficiency of irrigation has increased by 15~20%,
while considering drainage, as compared with conventional irrigation efficiency. Additionally,
the adjustment of crop planting structure can reduce regional evapotranspiration by 14.9%, reduce the
regional irrigation volume by 30%, and increase the net income of each regional water area by 16%. |
| Language: | English |
| Keywords: | crop planting structure; the modified soil and water assessment tool; water use
efficiency; optimization |