石灰岩土壤结构稳定性及影响因素研究  

Study on Structural Stability of Limestone Soil and Its Influencing Factors

作　　者：张治伟[1] 傅瓦利[1] 张洪[1] 袁红[1] 朱章雄[1] 文志林[1] 李芹[1] 

机构地区：[1]西南大学地理科学学院,重庆400715

出　　处：《水土保持学报》2009年第1期164-168,共5页Journal of Soil and Water Conservation

基　　金：重庆市科委软科学项目"石漠化与重庆岩溶地区农村经济发展关系研究(40600206)"

摘　　要：用萨维诺夫法分析了不同岩溶生态系统土壤团聚体的组成特征及差异,并研究了土壤结构胶结物质对石灰岩土壤结构稳定性的影响。结果表明,各岩溶生态系统土壤干筛团聚体含量高,差异较小,但湿筛后水稳性团聚体含量差异显著。灌丛夹马尾松生态系统土壤水稳性团聚体及水稳性大团聚体含量最高,团聚体的稳定性也最好,坡耕地和退耕地土壤水稳性团聚体及大团聚体含量则显著降低。相关分析表明,有机质含量及腐殖质品质是影响研究区石灰岩土壤水稳性团聚体含量、组成特征及稳定性的主要因素。Several soil profiles were chosen according to ecosystems on northern slope of Jinfo mountain, a typical karst area. Contents of water-stable aggregates and cementing substances in soil layers were measured for studying soil structure characteristics, compositive difference of soil aggregates and the influence factors of structural stability mechanism. Results show, the aggregates measured by dry sieve are quite similar under different karst systems, but water-stable aggregates are quite different. Soil profiles of shrub interspersed with Pinus massoniana Lamb have biggest values of water-stable aggregates and bigdiametral aggregates. At the same time, the destructive rates of aggregates in shrub ecosystem soils are smaller than that of sloping farmland after sieving in water. Significant positive correlations exist between water-stable aggregates and soil organic matter, carbon contents of HA and HA/FA. Contents of soil organic matter and quali ty of soil humus are the main factors which influence the contents of soil water-stable aggregates, the compositive characteristics of water-stable aggregates and its stability in karst area. Maybe, the decreases of clay and iron oxide are responsible at a certain extent for the degradation of soil structure after deforestation and farming.

关 键 词：岩溶区 土壤结构 胶结物质 影响因素 

分 类 号：S152.4[农业科学—土壤学]