龙脊梯田典型坡面表层土壤水分的空间变异特征  

Spatial Variation Characteristics of Surface Soil Water Content in Typical Slope of Longji Terrace

作　　者：田卓 何建华 张帅普 方荣杰[1,2] 李梓旋 邹传林 TIAN Zhuo;HE Jian-hua;ZHANG Shuai-pu;FANG Rong-jie;LI Zi-xuan;ZOU Chuan-lin(Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology,Guilin University of Technology,Guangxi Guilin 541004,China;Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area,Guilin University of Technology,Guangxi Guilin 541004,China)

机构地区：[1]桂林理工大学广西环境污染控制理论与技术重点实验室,广西桂林541004 [2]桂林理工大学岩溶地区水污染控制与用水安全保障协同创新中心,广西桂林541004

出　　处：《西南农业学报》2021年第10期2197-2203,共7页Southwest China Journal of Agricultural Sciences

基　　金：广西自然科学基金项目(2018GXNSFBA050013);桂林市科学研究与技术开发计划重大专项(20180102-2)。

摘　　要：【目的】分析广西龙脊梯田表层土壤的水分空间变异特征,为提高龙脊梯田的水资源利用效率与农业管理水平提供参考依据。【方法】以广西龙脊梯田典型坡面为研究对象,采用经典统计学方法分析其土壤(整体、田面外侧和内侧及田坎上侧和下侧土壤)含水量的统计学特征及其与环境因子的相关性,利用地统计学理论分析其土壤含水量的空间变异特征。【结果】龙脊梯田田面整体平均土壤含水量极显著高于田坎(P<0.01,下同),田面外侧和田坎上侧的平均土壤含水量分别显著高于田面内侧和田坎下侧。田面和田坎的土壤含水量均具有中等强度的空间变异性(10.00%≤变异系数(C_(V))≤100.00%)、空间自相关性[0.25≤C_(0)/(C_(0)+C)≤0.75]和极显著或显著(P<0.05,下同)的空间聚集性,其中,田坎土壤含水量的整体变异性高于田面,田面土壤含水量的空间自相关性弱于田坎,田面土壤含水量的空间聚集性高于田坎。Pearson相关分析结果表明,龙脊梯田的土壤含水量与土壤颗粒比表面积、黏粒含量和粉粒含量呈极显著正相关,与砂粒含量呈极显著负相关。【结论】土壤质地是龙脊梯田土壤水分空间变异的决定性因素,田面与田坎的土壤水分均具有中等程度变异性和显著的空间聚集特征。梯田耕作管理期间应尽量减少土壤细颗粒的流失,以维持土壤水分空间均衡,保障梯田水土的稳定性。【Objective】The aim of this work is to analyze the spatial variation characteristics of soil water content in the Longji terrace and to provide references for improving the efficiency of water resources utilization efficiency and agricultural management level of Longji terrace.【Method】Taking the typical slope of Longji terraces in Guangxi as the research object,the statistical characteristics of the water content of the soil(overall,lateral and medial soil of field,upper and lower soil of embankment)and its correlation with environmental factors were analyzed.Geostatistic was used to analyze the spatial variation characteristics of soil water content.【Result】The average soil water content for the terrace fields was extremely significantly higher than that for the terrace embankments(P<0.01,the same as below).Soil water content for the outside was significantly higher than that for the inside in the terrace fields,and soil water content for the upside was significantly higher than that for the downside in the terrace embankments.Soil water content of both the terrace fields and the terrace embankments showed moderate spatial variability(10.00%≤C_(V)≤100.00%),moderate spatial autocorrelation[0.25≤C_(0)/(C_(0)+C)≤0.75]and extremely significant or significant(P<0.05,the same as below)spatial aggregation.The overall spatial variability of soil water content for the terrace embankments was higher than that for the terrace fields.The spatial autocorrelation of soil water content in the terrace embankments was higher than that in the terrace fields,while the spatial aggregation of soil water content in the terrace embankments was lower than that in the terrace fields.The results of Pearson correlation analysis showed that soil water content was extremely significantly positively correlated with specific surface area of soil particles,clay content and silt content,while extremely significantly negatively correlated with sand content.【Conclusion】Soil texture is the decisive factor of the spatial vari

关 键 词：龙脊梯田 土壤含水量 空间变异 地统计学 

分 类 号：S152.7[农业科学—土壤学]