典型岩溶区旱季板栗树下岩溶溶蚀速率的研究

广西是全国板栗树主要种植区之一,研究区的隆安县具有"板栗之乡"之称,并且大部分板栗树种植在岩溶区。为了研究岩溶区种植板栗树后岩溶溶蚀的变化,本文通过野外溶蚀标准试片法,在典型岩溶区测定了相同地质背景下洼地板栗树、洼地草地、坡地灌木丛旱季试片绝对溶蚀量、溶蚀速率和土壤pH值等,并对洼地草地、坡地灌木丛土壤和洼地板栗树进行比较。结果表明:板栗树下土壤pH值偏低,呈弱酸性,低于坡地灌木丛和洼地草地,土地试片的溶蚀率则高于坡地灌木丛和洼地草地,而且土壤试片的溶蚀速率与土壤pH值呈显著负相关关系。因此,岩溶区板栗树的种植可能对岩溶溶蚀作用有促进的作用。

Study on Kart Processes under Castanea Mollissima Trees at Dry Season in Typical Karst Areas

Guangxi is the main growing region of Castanea mollissima trees.The study area of Longan County is celebrated as "the hometown of Castanea mollissima trees".And most Castanea mollissima trees grow in the karst areas.In order to examine changes in karst dissolution after planting Castanea mollissima trees,three types of soil were chosen as the test pieces which are acquired separately under Castanea mollissima trees of low-lying land,grass ground of low-lying land and the bushes of contoured land in the typical karst regions.This paper works out the absolute corrosion amounts,corrosion rates and the pH values of soil by the standard test method of outdoor corrosion.The result reveals that the pH value of soil under Castanea mollissima trees is lower,showing subacidity,and the high-to-low order of the pH values is: bush of contoured land,grass ground of low-lying land,and under castanea mollissima trees of low-lying land.While the high-to-low order of corrosion rates is: under Castane mollissima trees of low-lying land,bush of contoured land,and grass ground of low-lying land.The corrosion rate of soil is closely related to the pH value of soil,with a negative correlation.