Driving Factors and Numerical Simulation of Evapotranspiration of a Typical Cabbage Agroecosystem in the Shiyang River Basin, Northwest China

Tianyi Yang, Haichao Yu, Sien Li (), Xiangning Yuan, Xiang Ao, Haochong Chen, Yuexin Wang and Jie Ding
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Tianyi Yang: Center for Agricultural Water Research in China, China Agricultural University, Beijing 100083, China
Haichao Yu: Center for Agricultural Water Research in China, China Agricultural University, Beijing 100083, China
Sien Li: Center for Agricultural Water Research in China, China Agricultural University, Beijing 100083, China
Xiangning Yuan: Center for Agricultural Water Research in China, China Agricultural University, Beijing 100083, China
Xiang Ao: Center for Agricultural Water Research in China, China Agricultural University, Beijing 100083, China
Haochong Chen: Center for Agricultural Water Research in China, China Agricultural University, Beijing 100083, China
Yuexin Wang: Center for Agricultural Water Research in China, China Agricultural University, Beijing 100083, China
Jie Ding: Center for Agricultural Water Research in China, China Agricultural University, Beijing 100083, China

Agriculture, 2024, vol. 14, issue 6, 1-14

Abstract: Two years of field experiments were conducted at the National Field Observation Experiment Station for Efficient Agricultural Water Use in the Wuwei Oasis, Gansu Province. Based on the eddy correlation system, the evapotranspiration ( ET ) of the cabbage agroecosystem during the growth period was obtained and the main driving factors of ET changes were determined. The Root Zone Water Quality Model 2.0 version (RZWQM2 model) was used to simulate ET during the growth period. The results showed the following: (1) The ET of cabbage during the growth period was 260. 1 ± 24.2 mm, which was basically lower than other crops planted in this area. (2) Through partial correlation analysis and principal component analysis, it can be found that environmental and physiological factors jointly drive changes in ET . The main driving factors include gross primary productivity, net radiation, and water use efficiency. (3) The RZWQM2 model can simulate the ET of the cabbage agroecosystem well, especially in simulating the total ET value and its trend. The growth period ET s were 7.3% lower than the ET m . Cabbage is an important cash crop in Northwest China, and ET is an important component of the water cycle in the agroecosystem. Determining the main driving factors of ET is of great significance for the sustainable utilization of agricultural water resources in Northwest China. Our results can provide a scientific basis for the cultivation of cabbage as a cash crop and the development of water saving agriculture.

Keywords: evapotranspiration; agroecosystem; cabbages; eddy correlation system; driving factor (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
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