弄拉岩溶区次生林的生态水文效应

于2006年5月至7月对广西弄拉兰电堂泉水源林区各类水样的物理化学特征进行了研究。通过收集弄拉兰电堂泉集水区次生乔木林中的大气降雨、穿透雨、树干径流雨和表层岩溶泉水,对其中的化学成分含量和pH值进行了分析测定。结果表明:大气降雨经过森林层后,化学成分的总含量增加了;各种养分元素表现出不同的变化,Cl-和Na 减少,其余各离子以及TC、TIC和TOC都表现出增加,对应于每场降雨后的泉水中各成分的变化不是很显著;穿透雨和树干径流雨的pH值表现为下降,泉水的pH值变化幅度较小。经过次生林后的雨水可促进岩溶作用和表层岩溶带的生物地球化学循环,增加土壤中某些碱性元素的有效态。

Eco-hydrological effects of secondary forest in Nongla

In this paper, all kinds of waters' physical and chemical characters are researched in water-conserved forest of Landiantang spring basin in Nongla, Guangxi, from May to July in 2006. Some water samples in Rainfall,throughfall and stemflow were collected in the course of a single rainy season from water-conserved forest of Landiantang spring basin in Nongla. After the experiment of the samples,the chemical content and pH value can be concluded: the total of chemical content was increased after through the forest ecosystem. All chemical contents change differently, Cl- and Na were decreased ,all the others and TC,TIC,TOC increase, After the rainfall, the chemical contents of epikarst spring change insignificantly; the pH value of throughfall and stemflow was de-clined, the pH value of rainfall was not changed significantly. Precipitation through the forest ecosystem can accelerate karstification and biogeochemical cycle in Epikarst, increase some alkalinity element's effective state.