宝鸡地区L_(1)-S_(5)黄土和古土壤水分入渗及影响因素  

Water Infiltration and Influencing Factors of L_(1)-S_(5)Loess-Paleosol in Baoji Region

作　　者：郁耀闯[1,2,3] 杨树瑶 王长燕 龚兰兰[1,3] 赵景波 任媛媛 徐秋月[1,3] 侯英 Yu Yaochuang;Yang Shuyao;Wang Changyan;Gong Lanlan;Zhao Jingbo;Ren Yuanyuan;Xu Qiuyue;Hou Ying(College of Geography and Environment,Baoji University of Arts and Sciences,Baoji,Shaanxi 721013,China;State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi′an 710075,China;Key Laboratory of Disaster Monitoring and Mechanism Simulation of Shaanxi Province,Baoji University of Arts and Sciences,Baoji,Shaanxi 721013,China)

机构地区：[1]宝鸡文理学院地理与环境学院,宝鸡陕西721013 [2]中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,西安710075 [3]陕西省灾害监测与机理模拟实验室,宝鸡陕西721013

出　　处：《水土保持研究》2023年第6期78-85,共8页Research of Soil and Water Conservation

基　　金：中国科学院黄土与第四纪地质国家重点实验室项目(SKLLQG1934);国家自然科学基金(41771048);宝鸡文理学院博士科研启动费项目(ZK2017042)。

摘　　要：[目的]探究宝鸡中晚更新统L_(1)—S_(5)层黄土和古土壤层水分稳定入渗率变化特征及其与土壤容重、土壤初始含水量和土壤毛管孔隙度等土壤属性的关系,为揭示宝鸡中晚更新统L_(1)—S_(5)层黄土和古土壤的入渗规律提供参考依据。[方法]运用双环法进行入渗试验,探讨了宝鸡中晚更新统L_(1)—S_(5)层黄土和古土壤水分入渗的变化特征及其影响因素。[结果](1)宝鸡中晚更新统L_(1)—S_(5)黄土层的平均稳定入渗率(2.38 mm/min)大于古土壤层的平均稳定入渗率(1.55 mm/min),其差异的原因可能与形成时的气候与风化成壤作用的强弱有关。(2)L_(1)—S_(5)层黄土和古土壤层水分入渗试验过程可以用考斯加可夫和通用经验公式进行很好地拟合。(3)土壤容重、土壤初始含水量和土壤毛管孔隙度等土壤属性是影响L_(1)—S_(5)层黄土和古土壤层水分稳定入渗率变化的重要因素。(4)利用土壤容重、土壤毛管孔隙度和毛管最大持水量等土壤参数可以很好地模拟宝鸡中晚更新统L_(1)—S_(5)层黄土和古土壤层的土壤稳定入渗率(R 2=0.88,NSE=0.88)。[结论]宝鸡中晚更新统L_(1)—S_(5)层黄土和古土壤层水分稳定入渗率的变化主要由土壤容重、土壤初始含水量和土壤毛管孔隙度等土壤属性的变化所致,利用上述土壤参数可以较好地模拟该区中晚更新统L_(1)—S_(5)黄土和古土壤层土壤稳定入渗率的变化。[Objective]In order to provide a reference for revealing the infiltration law of the L_(1)—S_(5)layers of the Baoji loess-paleosol profiles in the middle and late Pleistocene,the variation characteristics of water stable infiltration rate of L_(1)—S_(5)loess and paleosol in Baoji Middle Late Pleistocene Series and its relationship with soil properties such as soil bulk density,initial soil water content and soil capillary porosity are explored.[Methods]The characteristics and its influencing factors of stable infiltration rate of loess and paleosol in the middle and late Pleistocene of Baoji were studied by double ring method.[Results](1)The average stable infiltration rate(2.38 mm/min)of the loess is higher than that of the paleosol(1.55 mm/min)in the middle and late Pleistocene of the L_(1)—S_(5)layers of the Baoji loess-paleosol profile,which may be related to the climate change at the time of formation and the strength of the weathering soil.(2)The infiltration experiment of loess and paleosol can be well fitted by using Kosgakov and general empirical formulas in the L_(1)—S_(5)layers of the Baoji loess-paleosol profile in the middle and late Pleistocene.(3)Soil properties,such as soil bulk density,initial soil water content,saturated soil water content and so on are important factors affecting the stable infiltration rate of loess and paleosol in the L_(1)—S_(5)layers of the middle and late Pleistocene of Baoji.(4)The soil stable infiltration rate(R 2=0.88,NSE=0.88)of loess and paleosol in the L_(1)—S_(5)layers of the Baoji loess-paleosol profile in the middle and late Pleistocene can be well simulated by using such parameters as soil bulk density,soil capillary porosity,maximum capillary water capacity,total soil porosity,soil saturated water content and soil initial water content.[Conclusion]The changes of stable water infiltration rate of loess and paleosol are mainly caused by the changes of soil bulk density,initial soil water content and capillary porosity.These soil parameters can be used

关 键 词：土壤入渗 黄土和古土壤 古气候变化 中晚更新统 宝鸡地区 

分 类 号：S152.7[农业科学—土壤学] P641[农业科学—农业基础科学]