古尔班通古特沙漠东南部不同类型沙丘土壤水分与地形-植被因子关系  

Study on the Relationship Between Soil Moisture and Topography-Vegetation Factors in Different Types of Ssand Dunes in the Southeastern Gurbantunggut Desert

作　　者：孙琰蕙 张定海[1] 吴贤忠 张艳灵 Sun Yanhui;Zhang Dinghai;Wu Xianzhong;Zhang Yanling(Center for Quantitative Biology,College of Science,Gansu Agricultural University,Lanzhou 730070,China;College of Urban Environment,Lanzhou City University,Lanzhou 730070,China)

机构地区：[1]甘肃农业大学理学院数量生物研究所,兰州730070 [2]兰州城市学院城市环境学院,兰州730070

出　　处：《水土保持研究》2024年第1期70-78,共9页Research of Soil and Water Conservation

基　　金：甘肃省科技计划项目(21JR7RA831);国家自然科学基金项目(41661022)。

摘　　要：[目的]揭示古尔班通古特沙漠土壤水分的分布规律及其与地形—植被因子的关系,对制定相应的防风固沙措施以及建立科学合理的植物固沙模式有积极的指导作用。[方法]以古尔班通古特沙漠东南部地区3种不同类型沙丘(固定、半固定和流动沙丘)为研究对象,利用方差分析和冗余分析等方法对3种不同类型沙丘上4种微地貌类型(迎风坡、背风坡、丘顶、丘底)不同深度土壤水分(0—40 cm, 40—200 cm, 200—300 cm)分布特征及其与地形—植被因子之间的关系进行综合分析。[结果](1)所有类型沙丘上0—300 cm土壤水分的波动程度随深度的增加逐渐减小,表层土壤水分的波动程度大于中层和深层。(2)所有类型沙丘不同深度的土壤水分有显著的差异,且背风坡、丘底和迎风坡3种微地貌类型上土壤水分相对较为集中。(3)地形—植被因子对研究区绝大多数(半)固定沙丘的土壤水分呈负相关关系,对(半)固定沙丘不同深度土壤水分影响较流动沙丘更为明显。[结论]所有类型沙丘上的土壤水分受地形因子的影响较植被因子强,而且影响不同类型沙丘土壤水分的主要地形—植被因子也不同。[Objective]The aim is to reveal the distribution pattern of soil moisture in the Gurbantunggut Desert and its relationship with topography-vegetation factors,which is a positive guide for formulating corresponding wind and sand control measures and establishing a scientific and reasonable plant sand fixation model.[Methods]Three different types of sand dunes(fixed,semi-fixed and mobile dunes)in the southeastern Gurbantunggut Desert were used to study the soil moisture at different depths(0—40 cm in the surface layer,40—200 cm in the middle layer and 200—200 cm in the deep layer)of four micro-landscape types(windward slope,leeward slope,mound top and mound bottom)on the three different types of sand dunes by using ANOVA and redundancy analysis.The distribution characteristics of soil moisture at different depths(0—40 cm in the surface layer,40—200 cm in the middle layer,and 200—300 cm in the deep layer)and its relationship with topography-vegetation factors were analyzed comprehensively.[Results](1)The fluctuation of soil moisture in 0—300 cm in all types of dunes gradually decreased with increasing depth,and the fluctuation of soil moisture in the surface layer was greater than that in the middle and deep layers.(2)There were significant differences in soil moisture at different depths in all types of dunes,and soil moisture was relatively more concentrated in three micro-landscape types:leeward slope,bottom of dune and windward slope.(3)Topography-vegetation factors had a negative correlation with soil moisture of most(semi-)fixed dunes in the study area,and the effect on soil moisture at different depths of(semi-)fixed dunes was more obvious than that of mobile dunes.[Conclusion]Soil moisture in all types of dunes is more strongly influenced by topographic factors than vegetation factors,and the main topographic-vegetation factors affecting soil moisture on different types of dunes are also different.

关 键 词：土壤水分 影响因子 冗余分析 古尔班通古特沙漠 

分 类 号：S152.7[农业科学—土壤学]