不同巨桉林下紫色土壤抗蚀性与土壤因子的耦合关系分析  

Degree of Coupling Relationship Between Anti-erodibility and Soil Factors of Purple Soil in Different Eucalyptus grandis Plantations

作　　者：谢贤健[1] 李永飞[1] 

机构地区：[1]内江师范学院,地理与资源科学学院,四川内江641000

出　　处：《水土保持学报》2017年第1期97-102,共6页Journal of Soil and Water Conservation

基　　金：四川省教育厅重点项目(16ZA0312);四川省教育厅科研创新团队基金项目(14TD0026)

摘　　要：为揭示耕地退耕成巨桉林后对土壤抗蚀性的影响,在野外调查和室内分析的基础上,以紫色土上栽培的6a生巨桉纯林、巨桉+果树、巨桉+粮食作物及农耕地土壤作为研究对象,利用主成分方法分析了影响巨桉林土壤抗蚀性的主要理化指标,同时结合灰色关联度构建了抗蚀性指数—土壤理化性质指标的耦合模型,对不同巨桉林的抗蚀性进行综合判定。结果表明:影响土壤抗蚀性的主要因子有>0.25mm团聚体含量、容重、有机质、平均重量直径、水稳性指数、有效钾、碱解氮,其中>0.25mm团聚体含量是决定土壤抗蚀性水平的最关键因素;平均重量直径和水稳性指数与土壤理化性质指标分别属于中等和较强关联,土壤理化性质对土壤抗蚀性的影响依次为>0.25mm团聚体含量>碱解氮>有效磷>有机质>有效钾>容重;土壤抗蚀性与土壤理化性质系统的整体耦合水平属于弱协调,系统耦合协调程度为巨桉纯林(中度协调)>耕地(弱协调)>林粮(轻度不协调)>林果(轻度不协调)。研究结论可为耕地退耕成巨桉林地的土壤抗蚀性评价提供一定的理论依据。In order to reveal the influence of anti-erodibility in the cultivated land after returning farmland to forest, based on the field investigation and lab analysis, purple soil samples of 6-year Eucalyptus grandis plantations including pure Eucalyptus grandis, Eucalyptus grandis ＋ grain crops, Eucalyptus grandis ＋ fruits and farmlands were chosen as researching materials, the main physical and chemical indexes of soil an- ti-erodibility were analyzed by using principal component analysis method. Further, the coupling model of soil physical and chemical properties index and anti-erodibility index was built up by grey relational degree, and the corrosion resistance of different Eucalyptus grandis plantations was synthetically determined. The results showed that the main factors affecting soil anti-erodibility were 〉0.25 mm aggregate content, bulk density, organic matter, mean weight diameter, water stability index, available potassium and alkaline hy- drolysis nitrogen, and 〉0.25 mm aggregate content was the most important factor to determine the level of soil anti-erodibility. There was a medium correlation between mean weight diameter and soil physical and chemical property indexes, there was a strong correlation between water stability index and soil physical and chemical property indexes. Effects of soil physical and chemical properties on soil anti-erodibility was followed by 〉0. 25 mm aggregate content〉 alkaline hydrolysis nitrogen〉 available phosphorus〉 organic matter,available potassium〉bulk density. The system＇s overall level of coupling between soil anti-erodibility and soil physical and chemical properties was weak coordination. On a smaller scale, the coordination degree of system coupling was pure Eucalyptus grandis （moderate coordination） 〉 farmlands （weak coordination） Eucalyptus grandis ＋ grain crops （mild incoordination） 〉Eucalyptus grandis ＋ fruits （mild incoordination）. Above all, the research conclusions could provide some theoretical basis for the evalu

关 键 词：巨桉 紫色土 抗蚀性 土壤理化性质 耦合关联 

分 类 号：S157.1[农业科学—土壤学]