蒸散分离的玉米水分利用效率变化及影响因素

doi:10.13866/j.azr.2023.07.09

Abstract

Abstract:

Water use efficiency (WUE) is an important indicator of the carbon-water cycle of farmland ecosystems and is of great significance for guiding agricultural irrigation and improving water productivity. Ningxia Irrigation area is a large-scale irrigation district located in the arid climate zone of China, where the corn planting area is the largest. Based on eddy flux observation of actual evapotranspiration (ET) of farmland ecosystems, this paper used the hydrogen and oxygen stable isotope method to segment evapotranspiration and estimated the total primary productivity (GPP) of typical maize farmland ecosystems in the Yellow River irrigation area of Ningxia using the LUE (Light Use Efficiency) model. Population Water Use Efficiency WUE_T= GPP/T, Ecosystem Water Use Efficiency WUE_ET= GPP/T, and Intrinsic Water Use Efficiency IWUE_VPD= (GPP·VPD)/ET were calculated. Then, the relationship between different WUE and environmental factors, such as air temperature, saturated water vapor pressure difference, CO₂ concentration, effective photosynthetic radiation, and soil water content was analyzed from three aspects: functional response relationship, correlation, and sensitivity. The result showed that the variation of actual evapotranspiration in the growing season of the maize agro-ecosystem in the Ningxia yellow irrigation area was single-humped, and the trends of crop transpiration and actual evapotranspiration were consistent. The variation of water use efficiency in the growing season was different among the three species, with WUE_T showing a “W-shaped” variation pattern during the growing season while WUE_ET and IWUE_VPD showed a “single-hump” variation pattern. All three WUE peaks occurred at the male tasseling stage, reaching (5.90 kg C·m^-3·H₂O, 5.02 kg C·m^-3·H₂O, 32.9 kg C·hPa·m^-3·H₂O) respectively. The three kinds of water use efficiency began to decrease in the late filing period, and WUE_T increased slightly in the late ripening period due to weak transpiration. Among the five environmental factors, WUE_T, WUE_ET and IWUE_VPD were positively correlated with soil water content, and the correlation and sensitivity were the strongest. The three water use efficiencies were significantly negatively correlated with VPD, with the second strongest correlation and sensitivity. Air temperature, photosynthetically active radiation, and CO₂ concentration were negatively correlated with the three kinds of WUE but not critical factors. Therefore, soil moisture and VPD are the key factors affecting the WUE of the maize farmland ecosystem in the Yellow River irrigation area of Ningxia.

Key words: stable isotopes of hydrogen and oxygen, evapotranspiration separation, light use efficiency model, gross primary productivity, crop transpiration

ZHUANG Haoran, FENG Kepeng, XU Dehao. Changes, influencing factors and sensitivity of water use efficiency in maize farmland ecosystems based on evapotranspiration separation in the Ningxia irrigated area[J].Arid Zone Research, 2023, 40(7): 1117-1130.

Figures/Tables 11

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Changes, influencing factors and sensitivity of water use efficiency in maize farmland ecosystems based on evapotranspiration separation in the Ningxia irrigated area

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