Diurnal and Seasonal Variations of Water Use Efficiency of Rice–Wheat Rotation Cropland in the Jianghuai River Basin of China

Author:

Zhao Xiaohan12ORCID,Zhang Fangmin1,Weng Shengheng3,Duan Chunfeng45,Lu Yanyu45

Affiliation:

1. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Jiangsu Key Laboratory of Agricultural Meteorology, College of Ecology and Applied Meteorology Nanjing University of Information Science & Technology Nanjing China

2. Hydrological Center of Shandong Province Jinan China

3. Fujian Institute of Meteorological Sciences China Meteorological Administration Fuzhou China

4. The Anhui Province Meteorological Science Research Institute/Atmospheric Science and Satellite Remote Sensing Key Lab Anhui Province Hefei China

5. Anhui Climate Center Hefei China

Abstract

ABSTRACTRice–wheat rotation cropland is one of the most important agroecosystems in South China, the escalation of conflict between food demand augment and water supply shortage increased with climate change. Water use efficiency plays a more significant role in optimising water and carbon management. Thus, the diurnal and seasonal variations of water use efficiency were assessed by the 3‐year eddy covariance observations in the Shouxian National Observatory, a typical rice–wheat rotation station. The results revealed a ‘U’‐shaped diurnal pattern of water use efficiency for winter wheat (Triticum aestivum L.) and rice (Oryza sativa L.). Seasonal water use efficiency had two peaks with the highest in the winter wheat‐growing season. The average water use efficiency for the rice–wheat rotation cropland was 2.85 g C kg−1 H2O over the whole year with 2.62 and 3.11 g C kg−1 H2O for winter wheat and rice, respectively. However, gross primary productivity and evapotranspiration of rice were higher than those of winter wheat. Temperature, photosynthetically active radiation were the principal impact factors of water use efficiency in the rice‐growing season. Comparatively, soil water and vapour pressure deficit dominated the water use efficiency changes in the winter wheat‐growing season. Our analyses can help understand the water use requirements for carbon assimilation on rice–wheat rotation cropland on the field scale.

Funder

National Key Research and Development Program of China

Anhui Provincial Key Research and Development Plan

National Natural Science Foundation of China

Publisher

Wiley

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