作　　者： ; ; ; ; (韦国富）;

机构地区： 中国科学院亚热带农业生态研究所

出　　处： 《应用生态学报》 2010年第9期2249-2256,共8页

摘　　要： 运用经典统计方法,以桂西北喀斯特峰丛洼地4个植被演替阶段(草地、灌木林、次生林、原生林)土壤表层(0～15 cm)和剖面为研究对象,采用冗余分析(RDA)方法分析土壤物理性质的时空分异成因.结果表明:灌木林和原生林表土的粘粒(<0.002 mm)和粉粒(0.002～0.05 mm)含量分别与其他3个演替阶段有显著差异;草地与次生林之间各粒级颗粒含量差异不显著;各演替阶段土壤砂粒(0.05～2.0 mm)含量均无显著差异;草地的容重与其他3个演替阶段差异极显著.草地粘粒含量随坡位升高而增加,其他植被类型为中坡位粘粒含量最高,且同一植被类型下不同坡位之间差异不显著.原生林0～30 cm土壤各层次间的粘粒含量变化幅度(14.55%)大于草地(7.12%)、灌木林(11.24%)和次生林(13.77%),人类干扰对表层土壤颗粒组成有很大影响.土壤物理性质主要受土壤有机碳和各演替阶段植被类型的影响,其中砂粒含量受裸岩率的影响较大. Soil samples were collected from the grassland,shrub land,secondary forest,and original forest on the hill slope in a typical karst peakcluster depression area of northwest Guanxi,with the spatiotemporal heterogeneity of soil physical properties investigated by classical statistics,and the formation causes of the heterogeneity analyzed by redundancy analysis（RDA）.In 0-15 cm soil layer,the clay（0.002 mm） and silt（0.002-0.05 mm） contents of shrub land and original forest had significant differences with those of grassland and secondary forest,respectively,but the clay,silt,and sand（0.05-2.0 mm） contents had no significant differences between grassland and secondary forest.No significant difference was observed in the soil sand content among the four land types,but the soil bulk density of grassland was significantly different from that of other three land types.The soil clay content of grassland increased with increasing elevation,while that of the other three land types was the highest on medium slope,and had no significant differences for the same land types among different slope locations.The soil clay content in different layers of 0-30 cm had a greater variation extent in original forest（14.55%） than in grassland（7.12%）,shrub land（11.24%）,and secondary forest（13.77%）,and the soil particle size composition was greatly affected by the disturbance of human activities.Soil organic carbon（SOC） and vegetation type were the dominant factors affecting the soil physical properties,and the bare rock ratio had greater effects on soil sand content.

关 键 词： 喀斯特峰丛洼地 土壤物理性质 颗粒组成 容重 冗余分析

领　　域： [农业科学] [农业科学]