岩溶区不同土地利用方式对溶蚀速率的影响研究  

Effects of Different Types of Land Use on Dissolution Rates in Karst Mountain Area

作　　者：甄晓君[1] 傅瓦利[1] 段正锋[1] 杜富芝[1] 马志敏[1] 孙璐[1] 徐泉斌[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2期11-14,20,共5页Journal of Soil and Water Conservation

基　　金：重庆市软科学基金(CSTC;2006EB1040);国家自然科学基金(40701179)

摘　　要：以重庆市中梁山岩溶区为例,选取草地、园地、耕地、菜地和林地等5种主要土地利用类型,通过野外溶蚀试片法获得溶蚀速率,分析不同土地利用方式下土壤性质对溶蚀速率的影响。结果表明:土地利用方式的不同造成土壤性质一系列的变化,对岩石的溶蚀速率产生明显的影响。对不同土地利用方式下平均溶蚀速率进行比较:林地>菜地>耕地>园地>草地;其中林地最大,可达303.92 mg/m2.d,明显高于其它土地利用方式。溶蚀速率受土壤pH值、有机碳、土壤水分和土壤孔隙度相互作用的共同影响,并不能笼统地说有机碳含量高就会对溶蚀速率有促进作用,土壤pH值成为影响溶蚀速率一个重要的控制因素。随着土壤深度的增加,土壤性质对溶蚀速率的影响减弱。林地可以促进碳酸盐岩溶蚀成土速率,有利于岩溶区土层不断增厚,同时林地具有较好的涵养水源功能,在岩溶区提高森林植被覆盖率具有重要意义。Taking the karst area of Zhongliang mountain as a case study, discuss the effects of different types of land use on soil properties where five types of land-use were encountered; filed dissolution test of limestone pieces, carried out in the karst area, revealed how soil properties of different types of land use affect the dissolution rate. The results indicate that the soil properties was very different with land use types, and the dissolution rate is quite different. There is appreciable difference in average dissolution rates of limestone tablets. They are from the highest to lowest are as follows, wood land, vegetable land, tilled land,orchard land,grass land. The dissolution rate of wood land is 303.92 mg/m^2.d, which is much higher than the others. The results indicate that the multi-variable coupling of the soil pH,SOC and soil water affects the dissolution rate, and we shouldn＇t say that a high soil SOC has a promotion for the dissolution rate because the soil pH play a key role. The influence on dissolution rate from soil properties become weaken along with the soil depth. Wood land have a positive impact on dissolution rate of carbonate rock and increase of the soli thickness, so raising percentage of land-covered forests have a important significance in karst area.

关 键 词：岩溶区 土地利用 土壤性质 溶蚀速率 

分 类 号：S157.1[农业科学—土壤学]