中文摘要：

以重庆中梁山岩溶山区为例,通过野外溶蚀试片法和测量土壤孔隙度、容重、水分、有机碳含量和pH值的方法,探讨雨季和全年不同土地利用方式下土壤性质变化及其对土下岩石溶蚀速率的影响。结果表明：不同季节不同土地利用方式下土下岩石溶蚀速率差异显著,雨季溶蚀速率要大于全年溶蚀速率,雨季溶蚀量对全年溶蚀量贡献较大,雨热同期有利于岩溶作用的进行。总体上,不同土地利用方式下土下岩石溶蚀速率大小顺序为：林地〉草地〉菜地〉耕地,其中林地最大,耕地最小。土壤有机碳、pH值、孔隙度和水分等相互联系,相互作用共同影响土下岩石溶蚀速率。人类活动能够改变土壤理化性质,促进或抑制岩溶作用的进行。林地利于碳酸盐岩石的溶蚀,促进石灰岩地区溶蚀成土速率,在岩溶区提高植被覆盖率是防治石漠化的有效措施。

英文摘要：

Taking the karst area of Zhongliang mountain as a case study,the authors discussed the impact of landuse and season cover on karst processes based on the data of field standard limestone tablet,moisture,porosity,pH,and organic matter content of soils.The results showed that there was appreciable difference in average dissolution rates of limestone tablets.They were from the highest to lowest as follows： wood land,grass land,vegetable land,tilled land.The dissolution rate of wood land was the highest one,which was much higher than the others.With compared the dissolution rate of rainy season and the whole year,it found that the dissolution rate of rainy season was higher than the whole year＇s,temperature and rainfall were the important fators in the dissolution process.The results indicated that the multi-variable coupling of the soil pH,organic and soil water affected the dissolution rate.Human activities could change soil properties or inhibit the process of karst.Wood land is conducive to the dissiolution of carbonate rocks,which can promote soil formation rate of dissiolution in karst region.Therefore,increasing vegetable cover in karst area is an effective measure to prevent desertification.