科研之友
微信
新浪微博
Facebook
分享链接
摘要
Rainfall, throughfall, stemflow and spring were studied in a secondary forest during a wet season from April to August in 2006. Some of the chemicals in throughfall, stemflow and spring were increased in contrast with incident rainfall. Specifically, Cl(-), HCO(3) (-), Na(+) and Ca(2+) were leached negatively in throughfall, but K(+) and Mg(2+) were leached positively. In stemflow, Cl(-) and Na(+) were leached negatively, the others were leached positively and their concentrations were higher than those in throughfall. Total carbon, organic carbon and inorganic carbon in throughfall and stemflow were increased as rainfall went through the secondary forest. The concentration of free CO(2) in rainfall was lower than both, throughfall and stemflow; the relationship between total acidity and free CO(2) was linear. pH of throughfall and stemflow , such as maximum, minimum and mean, were lower than that of rainfall and the extent of pH in spring was changed minimally. We came to a conclusion that rainfall via the secondary forest can lead to further erosion, accelerate the biogeochemical cycle in epikarst zone, enhance the effective state of alkali elements in the soil, supply vegetation with more nutrients and advance vegetation's growth and succession, which are reasonably sufficient to form a stable karst ecosystem.
- 出版日期2009-1
- 单位中国地质科学院岩溶地质研究所; 湖南大学
