【摘要】 对贵州喀斯特山区不同石漠化等级土壤粒级进行了研究。结果表明,在贵州省喀斯特山区不同石漠化等级土壤垂直断面(A—B—C)<0.001mm黏粒增加;0.01～0.05mm,0.05～0.25mm细砂粒和0.25～1mm粗砂粒减少。随着石漠化程度增强土壤表层(0—20mm)黏粒含量减少,砂粒增加。在贵州省西部地区,<0.005mm的土粒随着石漠化程度的加剧含量减少。不同石漠化等级中<0.005mm土粒与有机质成极显著正相关关系,相关系数为0.95;0.05～1mm土粒与有机质成显著负相关关系,相关系数为0.63。更多还原

【Abstract】 Soil mechanical composition in the karst area of rocky desertification,Guizhou Province was studied.Results show that with rocky desertification intensified,the content of clay decreased,and the content of sand increased.In the sol profile(A—B—C),clay(smaller than 0.001 mm)gradually increased with depth,whereas sand(in the ranges of 0.01～0.05 mm,0.05～0.25 mm and 0.25～1 mm)gradually decreased.Within the surface layer(0～20 mm),the amount of sand decreased,and the amount of clay increased.The content of clay decreased in west part of the area as well.The correlation between the content of clay and organic matter was significantly positive with the correlation coefficient being 0.95.On the contrary,the correlation between sand and organic matter was significantly negative with the correlation coefficient being 0.63.更多还原