灌溉排水学报2025，Vol.44Issue(4)：47-56,10.DOI:10.13522/j.cnki.ggps.2024297
夹沙分层配土条件下紫花苜蓿的光合及蒸腾特性研究
Effect of stratified soil mixed with sand on photosynthesis and transpiration of alfalfa
摘要
Abstract
[Objective]Stratifying soil with sand is an engineering technique commonly used to improve the drainage and aeration of fine-textured soils.This study investigates its effects on the growth,transpiration,and photosynthesis of alfalfa.[Method]A field experiment was conducted to compare intact soil(FUS)and soil treated with a sand-stratification technique(ALS).In each treatment,physiological traits,photosynthetic traits,transpiration,and water consumption of alfalfa were measured.The hydrothermal balance of each soil type was analyzed using the soil-heat-water model.[Result]Under identical conditions,ALS significantly influenced the physiological and ecological traits of alfalfa.Specifically,compared to FUS,ALS increased average plant height by 8.5%,stem diameter by 10.4%,stem-to-leaf ratio by 18.2%,and dry mass by 7.1%.Under natural conditions,ALS increased the daily average net photosynthetic rate by 8.69%to 109.39%,with maximum increases ranging from 9.27%to 64.23%.Moreover,ALS significantly enhanced transpiration and stomatal conductance compared to FUS.The total evapotranspiration of alfalfa was 576.85 mm under FUS and 381.45 mm under ALS.Additionally,ALS reduced soil-surface evaporation by 51.22%during the peak water-demand period of the growing season.[Conclusion]Stratifying fine-textured soil with sand improved water infiltration,reduced soil surface evaporation,and enhanced the water use efficiency of alfalfa,thereby increasing its yield.关键词
干旱区/紫花苜蓿/分层配土/光合特性/蒸腾特性Key words
arid area/alfalfa/artificially layered soil/photosynthetic characteristics/transpiration characteristics分类
农业科学引用本文复制引用
张永兴,袁日萍,甘永德,郑丽萍,王尚涛,刘欢,贾仰文,牛存稳..夹沙分层配土条件下紫花苜蓿的光合及蒸腾特性研究[J].灌溉排水学报,2025,44(4):47-56,10.基金项目
柴达木盆地盐湖生态综合调查项目(DD20220958) （DD20220958）
青海省重大科技专项(2021-SF-134) （2021-SF-134）
