高吸水性聚合物γ-聚谷氨酸对砂壤土水分运移的影响  

Effects of the Super-absorbent Polymer (Poly-γ-glutamic Acid) on Water Transport of Sandy Loam Soil

作　　者：陈琳 涂坤 姜庆飞 黄开生 CHEN Lin;TU Kun;JIANG Qing-fei;HUANG Kai-sheng(Qingdao Yellow River Diversion Water Group Co.,Ltd.,Qingdao 266000,China;School of Geoscience and Surveying Engineering,China University of Mining and Technology(Beijing),Beijing 100831,China;Jiangxi Mingze Water Conservancy Construction Co.,Ltd.,Shangrao 334000,China;Ningbo Yinzhou Design Institute of Water Conservancy and Hydro-electric Power,Ningbo 315100,China)

机构地区：[1]青岛引黄济青水务集团有限公司,山东青岛266000 [2]中国矿业大学(北京)地球科学与测绘工程学院,北京100831 [3]江西明泽水利建设有限公司,江西上饶334000 [4]宁波市鄞州区水利水电勘测设计院,浙江宁波315100

出　　处：《海河水利》2023年第2期84-89,共6页Haihe Water Resources

基　　金：中国博士后科学基金(2021M693426)。

摘　　要：高吸水性聚合物γ-聚谷氨酸(γ-PGA)又名纳豆胶,是一种节水材料和土壤改良剂,目前已被广泛应用于农业生产。采用室内试验和数值模拟相结合的方法,研究了γ-PGA施用量、施用深度和土壤容重对砂壤土水分入渗特性的交互影响。结果表明,累积入渗量随γ-PGA施用量的增加而减小,入渗率随γ-PGA施用量的增加而减小,Philip入渗模型的吸渗率S和入渗率A值均随土壤容重和γ-PGA施用量的增加而降低;土壤中施加γ-PGA后,饱和含水率θs随γ-PGA施用量的增加而递增,θs增幅为3.15%~10.77%,各处理残余含水率θr变幅为0.031~0.033,其变化不显著,进气吸力值α有明显降低,其极差为0.004 6,n值随γ-PGA施用量的增加而降低,其极差为0.13;土壤容重和γ-PGA施用深度对累积入渗量的影响较γ-PGA施用量更明显。The poly-γ-glutamic acid(γ-PGA),also known as natto gum as a water-saving material and soil improver,has been widely adopted in agriculture production.The interactive effects of γ-PGA application rate,γ-PGA application depth and soil bulk density on water infiltration characteristics of sandy loam were studied by laboratory experiment and numerical simulation. The results showed that the cumulative infiltration amount decreased with the increase of γ-PGA application amount,the infiltration rate decreased with the increase of γ-PGA application amount,and the imbibition rate(S)and the infiltration rate(A)of the Philip infiltration model values decreased with the increase of soil bulk density and γ-PGA application amount.After γ-PGA was applied to the soil,the saturated water content θs increased with the increase of γ-PGA application amount,and θs increased by 3.15%~10.77%.The residual water content θr of each treatment ranged from 0.031 to0.033,which was not significant.The inlet suction value α decreased significantly,whose extreme difference was 0.004 6.The value of n decreased with the increase of γ-PGA application amount,whose extreme difference was 0.13.The effects of soil bulk density and γ-PGA application depth on the cumulative infiltration were more obvious than that of γ-PGA application.

关 键 词：HYDRUS-1D模型 Γ-聚谷氨酸 土壤入渗特性 砂壤土 

分 类 号：S273.4[农业科学—农业水土工程] TV214[农业科学—农业工程]