东北典型黑土区积雪-冻融耦合作用下的包气带水热运移模拟  

Simulation of Water Heat Transfer in Aerated Zone under Coupling Effect of Snow and Freeze-Thaw in Typical Black Earth Soil Region of Northeast China

作　　者：孙国静 卞建民[1,2] 王宇 阮冬梅[1,2] 谷志琪 SUN Guojing;BIAN Jianmin;WANG Yu;RUAN Dongmei;GU Zhiqi(Key Laboratory of Groundwater Resources and Environment of the Ministry of Education,Jilin University,Changchun 130021,China;College of New Energy and Environment,Jilin University,Changchun 130021,China)

机构地区：[1]吉林大学地下水资源与环境教育部重点实验室,长春130021 [2]吉林大学新能源与环境学院,长春130021

出　　处：《吉林农业大学学报》2024年第2期306-314,共9页Journal of Jilin Agricultural University

基　　金：国家自然科学基金项目(42272299);吉林省科技发展计划项目(20220101173JC)。

摘　　要：积雪-冻融耦合作用可改变黑土内部水热分布,进而影响其营养组分。为探究典型黑土区积雪-冻融条件下的水热运移规律,以吉林省公主岭市为例,基于野外原位观测试验,开展了典型黑土区积雪-冻融耦合作用下的包气带水热运移模拟,利用Morris筛选法进行了参数敏感性分析,并模拟分析了不同外界温度和积雪覆盖情景对黑土水分运移的影响。结果表明:研究区春季融雪水可使深在20 cm以上的黑土含水率增加约12%;基于野外观测构建的模型对60~80 cm的土层模拟效果最佳;敏感性分析的5个参数中残余土壤含水量θr的敏感度最高,其灵敏度系数为2.9546;外界温度影响土壤含水率突降的时间,积雪覆盖条件主要影响含水率大小及水分保持。The coupling effect of snow and freeze-thaw can change the distribution of water and heat in black soil,and therefore affect soil fertility.To explore the laws of water and heat transfer under snow and freeze-thaw conditions in typical black soil areas,taking Gongzhuling city of Jilin province as an example,based on field in-situ observation tests,water and heat transfer simulation in aeration zone under the coupling effect of snow freeze-thaw in typical black soil areas was carried out.The Morris′s screening method was used to conduct parameter sensitivity analysis,and the effectst of different external temperatures and snow cover scenarios on water transfer in black soil were simulated and analyzed.The results show that the snowmelt water in spring in the research area can increase the moisture content of black soil with a depth of more than 20 cm by about 12%;The model based on field observation has the best simulation effect on the soil layer of 60-80 cm;Residual soil moisture content in the five parameters of sensitivity analysis has the highest sensitivity,and its sensitivity coefficient reaches 2.9546;The external temperature affects the time when the soil moisture content drops suddenly,and the snow cover conditions mainly affect the moisture content and water retention.

关 键 词：东北黑土区 积雪覆盖 冻融 水热特征 HYDRUS-1D模型 Morris筛选法 情景模拟 

分 类 号：S152.7[农业科学—土壤学]