基于小波分析的土壤体积含水量动态研究  

Dynamic study of soil volumetric water content based on wavelet analysis

作　　者：吴越 郝慧清 郝永红[4] 盖玉婧 李泽溦 刘彦[1,2] WU Yue;HAO Huiqing;HAO Yonghong;GAI Yujing;LI Zewei;LIU Yan(School of Mathematical Sciences,Tianjin Normal University,Tianjin 300387,China;Institute of Mathematics and Interdisciplinary Sciences,Tianjin Normal University,Tianjin 300387,China;School of Geography and Environmental Science,Tianjin Normal Uni-versity,Tianjin 300387,China;Tianjin Key Laboratory of Water Resources and Environment,Tianjin Normal University,Tianjin 300387,China)

机构地区：[1]天津师范大学数学科学学院,天津300387 [2]天津师范大学数学与交叉科学研究院,天津300387 [3]天津师范大学地理与环境科学学院,天津300387 [4]天津师范大学水资源与水环境重点实验室,天津300387

出　　处：《天津师范大学学报(自然科学版)》2025年第1期52-59,68,共9页Journal of Tianjin Normal University:Natural Science Edition

基　　金：国家自然科学基金资助项目(42072277,U2244214,41272245,40972165,40572150,42307088);天津师范大学研究生科研创新项目(2023KYCX056Y,2022KYCX108Y).

摘　　要：为了解自然条件下土壤水分的运移规律,基于2010—2016年美国俄克拉荷马州立大学农业综合试验场不同植被区域的土壤水分数据,采用交叉小波和小波相干等方法,分析土壤水分对不同气象指标和植被的响应模式.结果表明:①红杉林、橡树林和草地的土壤年均体积含水量分别为0.154、0.113和0.254 m^(3)/m^(3),红杉林和橡树林等乔木林的土壤体积含水量长年低于同等条件下草地的值,且差异在冬季更加显著.②在年际尺度上,3种植被的土壤体积含水量与降水、温度均呈显著的绝对相关性.降水与草地土壤体积含水量的潜在因果性较弱,与红杉林土壤体积含水量的潜在因果性较强;温度与草地土壤体积含水量的潜在因果性较强,与红杉林土壤体积含水量的潜在因果性较弱.③在月际至半年际尺度上,3种植被的土壤体积含水量与温度的因果关系很弱,与降水的因果关系较强.④土壤体积含水量峰值的出现早于当年降水和温度的峰值.上述差异化现象与不同植被的根系固水、吸水能力以及叶片的保温能力、覆盖面积不同有关.In order to study the rule of soil water transport under natural conditions,based on the soil water data in different vegetation areas in the agricultural comprehensive test field of Oklahoma State University of USA from 2010 to 2016,the response models of soil water to different meteorological indexes and vegetation were analyzed using cross wavelet and wavelet coherence methods.The results showed that:①The average annual soil volumetric water contents of sequoia,oak forests and grassland were 0.154,0.113 and 0.254 m^(3)/m^(3),respectively.The soil volumetric water contents of sequoia and oak forests were lower than that of grassland under the same conditions throughout the year,and the difference was more statistically sig-nificant in winter.②There was a significant absolute correlation between soil volumetric water content of three different vege-tation and precipitation,temperature on an interannual scale.The causality between precipitation and soil volumetric water content of grassland was weak,while that between precipitation and soil volumetric water content of sequoia forest was strong.There was a strong causal relationship between temperature and soil volumetric water content of grassland,but a weak causal-ity relationship between temperature and soil volumetric water content of sequoia forest.③On the intermonthly to semi-annual scale,the causality relationship between soil volumetric water content of three regetations and temperature was weak,while the causality relationship between soil volumetric water content and precipitation was strong.④The peak of soil volumetric water content occured earlier than the peaks of precipitation and temperature in the same year.These differences are related to the differences in the water retention capacity and water absorption capacity of roots,as well as the insulation capacity and cover-age area of leaves in different vegetation.

关 键 词：土壤体积含水量 交叉小波 小波相干 相关性分析 植被 降水 

分 类 号：O29[理学—应用数学] S152.7[理学—数学]