草海不同石漠化程度土壤分形特征研究  

Fractal Features of Soil in the Different Degrees of Stony Desertification in Caohai

作　　者：李翠莲[1,2] 戴全厚[1] 姚云 

机构地区：[1]贵州大学林学院,贵阳550025 [2]息烽县林业绿化局,贵州息烽551100 [3]息烽县水务管理局,贵州息烽551100

出　　处：《水土保持研究》2015年第1期158-162,167,共6页Research of Soil and Water Conservation

基　　金：国家"十二五"科技支撑计划(2011BAC02B02);国家自然科学基金(41461057);贵州省重大应用基础专项(黔科合JZ字[2014]2002);贵州省喀斯特生态与环境专业学位研究生工作站(贵州省教育厅;2014)

摘　　要：基于土壤粒径分形维数的计算方法,对草海不同石漠化程度土壤颗粒、微团聚体、团聚体粒径分布的分形维数进行了研究。结果表明：石漠化地区土壤颗粒分形维数与土壤粉粒（0.001～0.05mm）呈极显著负相关（r=-0.963＊＊,P〈0.01）,与土壤黏粒（〈0.001mm）呈极显著正相关（r=0.995^＊＊,P〈0.01）;土壤微团聚体主要以〉0.01mm的大粒级微团聚体为主,其分形维数与大粒级（〉0.01mm）微团聚体表现出呈极显著的负相关（r=-0.964^＊＊,P〈0.01）;土壤风干团聚体〉5mm粒级的含量达到70%以上。湿筛后,〉5mm土壤团聚体含量减少,其余粒级有不同程度的增加,其中〈0.25mm的增幅最大。石漠化程度的加剧,使土壤黏粒含量逐渐增多,土壤颗粒、土壤微团聚体分形维数逐渐增大。通过对草海地区石漠化土壤结构特征的研究,可为草海地区石漠化治理、草海湿地的保护提供参考。Based on the calculation method of soil fractal dimension,the fractal dimension of soil particle,micro-aggregates and water-stable aggregates in different degree of Stony Desertification in Caohai was studied.The results showed that the fractal dimension of particle size distribution was dramatically negatively correlated with soil silt（0.001—0.005mm）（r=-0.963^＊＊,P〈0.01）and significantly positively correlated with soil clay（〈0.001mm）（r=0.995^＊＊,P〈0.01）.Soil micro-aggregates（〉0.01 mm）was main component of aggregate,its fractal dimension was significantly positively correlated with large size micro-aggregates（〉0.01mm）（r=-0.964^＊＊,P〈0.01）.Air-dried soil aggregate（〉5 mm）accounts for more than 70% of air-dried soil aggregate composition.Through wet screen processing,air-dried soil aggregate（〉5 mm）reduced,the other sizes of aggregates increase to some extent,increment of〈0.25 mm aggregate significant.In the process of desertification,soil clay content increased,the fractal dimension of soil particles and micro-aggregates fractal dimension increased gradually.This study aims to provide reference for desertification control and wetland protection of Caohai through the study of rocky desertification soil structure characteristics.

关 键 词：草海 石漠化程度 分形维数 

分 类 号：S152.3[农业科学—土壤学]