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Evaluating the soil evaporation loss rate in a gravel-sand mulching environment based on stable isotopes data

Journal of Arid Land 2022年第8期14卷 925-939页

作者： YANG Ye ZHANG Mingjun ZHANG Yu WANG Shengjie WANG Jiaxin College of Geography and Environmental Science Northwest Normal UniversityLanzhou 730070China Key Laboratory of Resource Environment and Sustainable Development of Oasis Lanzhou 730070China

In order to cope with drought and water shortages,the working people in the arid areas of Northwest China have developed a drought-resistant planting method,namely,gravel-sand mulching,after long-term agricultural *** understand the effects of gravel-sand mulching on soil water evaporation,we selected Baifeng peach(Amygdalus persica L.)orchards in Northwest China as the experimental field in *** on continuously collected soil water stable isotopes data,we evaluated the soil evaporation loss rate in a gravel-sand mulching environment using the line-conditioned excess(lc-excess)coupled Rayleigh fractionation model and Craig-Gordon *** results show that the average soil water content in the plots with gravel-sand mulching is 1.86%higher than that without gravel-sand *** monthly variation of the soil water content is smaller in the plots with gravel-sand mulching than that without gravel-sand ***,the average lc-excess value in the plots without gravel-sand mulching is *** addition,the soil evaporation loss rate in the plots with gravel-sand mulching is lower than that in the plots without gravel-sand *** lc-excess value was negative for both the plots with and without gravel-sand mulching,and it has good correlation with relative humidity,average temperature,input water content,and soil water *** effect of gravel-sand mulching on soil evaporation is most prominent in *** with the evaporation data of similar environments in the literature,the lc-excess coupled Rayleigh fractionation model is *** isotopes evidence shows that gravel-sand mulching can effectively reduce soil water evaporation,which provides a theoretical basis for agricultural water management and optimization of water-saving methods in arid areas.

关键词： soil evaporation loss rate gravel-sand mulching stable isotopes line-conditioned excess coupled Rayleigh fractionation model Craig-Gordon model

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