摘要
[目的]分析石漠化坡地不同整地措施下表层土壤水分的空间分布特征,为提高石漠化坡地的水资源利用效率和农业管理水平提供参考依据。[方法]以石漠化坡地中反坡、斜坡和平地3种整地措施下的柑橘林地为研究对象,采用经典统计学、地统计学和多重分形理论研究土壤水分的空间分布特征。[结果](1)反坡的土壤含水量显著高于平地和斜坡(p<0.05),平地土壤含水量的空间连续性和聚集性以及总变异和结构性变异强于斜坡和反坡。(2)不同整地措施下的土壤含水量均具有中等强度变异性(10.00%≤CV≤100.00%)、强空间自相关性[C_(0)/(C_(0)+C)≤0.25]和极显著(p<0.01)的空间聚集性。(3)不同整地措施下的土壤含水量分布具有多重分形特征,旱季时反坡的土壤含水量分布区间最窄,斜坡的土壤含水量分布更离散;雨季时平地的土壤含水量分布区间最窄,反坡的土壤含水量更不均匀。[结论]土壤机械组成是影响土壤含水量的主要因素,反坡整地措施更有利于改善石漠化坡地的土壤水分条件。
[Objective]The objective of this study was to analyze the spatial distribution characteristics of surface soil moisture content in the rocky desertification slope under different land preparation measures and to provide references for improving water resources utilization efficiency and agricultural management level on rocky desertification slopes.[Methods]The citrus forest under three land preparation measures of reverse slope,flat terrace,and natural slope on rocky desertification slope were chosen as the research objects.Classical statistics,geostatistics and multifractal theory were used to analyze the spatial distribution characteristics of soil moisture content.[Results](1)The soil moisture content of the reverse slope was significantly higher than that of the flat terrace and the natural slope(p<0.05).The spatial continuity,aggregation,total and structural variability of soil moisture content on the flat terrace were stronger than those on the reverse slope and the natural slope.(2)The soil moisture content of different land preparation measures showed moderate variability(10.00%≤CV≤100.00%),strong spatial autocorrelation[C_(0)/(C_(0)+C)≤0.25],and extremely significant(p<0.01)spatial aggregation.(3)The distribution of soil moisture content under different land preparation measures has multi-fractal characteristics.During the dry season,the distribution range of soil moisture content was narrowest on the reverse slope,and more discrete on the natural slope.During the rainy season,the distribution range of soil moisture content was narrowest on the flat terrace,and more uneven on the reverse slope.[Conclusion]Soil mechanical composition was the main factor that affected soil moisture content,and the reverse slope was more conducive to improved soil moisture conditions on rocky desertification slopes.
作者
田卓
张帅普
徐勤学
TIAN Zhuo;ZHANG Shuaipu;XU Qinxue(College of Agricultural Science and Engineering,Hohai University,Nanjing 210098,China;Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology,Guilin University of Technology,Guilin,Guangxi 541004,China;Collaborative Innovation Center for Water Pollution Control and Water Security in Karst Region,Guilin University of Technology,Guilin,Guangxi 541004,China)
出处
《水土保持学报》
CSCD
北大核心
2024年第4期335-345,共11页
Journal of Soil and Water Conservation
基金
国家自然科学基金项目(42267045)
广西重点研发计划项目(桂科AB22035058)。
关键词
石漠化坡地
整地措施
土壤水分
空间分布
rocky desertification slope
land preparation measure
soil moisture
spatial distribution
