柠条平茬对荒漠草原土壤水分特征及水量平衡的影响OA北大核心CSTPCD

Leaving stubble is an important method to optimize the management of Caragana intermedia on the desert steppe.The aim of this study was to determine the effects of Caragana stubble on the soil water characteristics and water balance,to provide a theoretical basis and practical guidance for rational cropping of Caragana on the desert steppe.A field study was conducted at a Caragana plantation in desert grassland of Ningxia,involving four cropping configurations:No stubble (WP);one belt stubble and one belt no stubble (G1P1),three belts stubble and three belts no stubble (G3P3),and five belts stubble and five belts no stubble (G5P5).The effects of these different cropping configurations on soil moisture and water balance were analyzed.It was found that:1) The highest soil moisture content was in the G3P3 treatment,and the moisture content in the 0-200 cm soil layer increased with increasing soil depth;2) Compared with natural grassland without Caragana,the WP,G1P1,G3P3,and G5P5 treatments all resulted in soil water deficit to varying degrees;the lowest water deficit index was in the G3P3 treatment,indicative of reduced soil water consumption.3) Under the influence of environment and stubble treatments,the treatments were ranked,from highest transpiration of vegetation to lowest,as follows:G3P3<G1P1<G5P5<WP;and from highest evapotranspiration between trees to lowest,as follows:G3P3<G1P1<WP<G5P5.The ratio of evapotranspiration to rainfall was lowest in the G3P3 treatment.Based on the characteristics of soil water and water balance,the G3P3 treatment was more conducive to water retention and water balance in areas planted with Caragana on the desert steppe.