松柏混交林对酸雨和金属元素的净化作用

以日本国滋贺县大津市桐生自然保护区日本赤松、黑松和扁柏混交林小流域为研究对象，以若女自然保护区疏林地小流域作对照，对两地的林外降水、流出水，以及混交林中的穿透水、树干流中的ｐＨ值、电导率和钾、钠等１４种金属元素，以及硅、硼等非金属元素，进行了为期一年的定位观测研究．结果表明，松柏混交林生态系统和花岗岩发育形成的土壤，对酸雨、金属元素等，均具有一定的净化作用．但松柏混交林生态系统的净化作用大于疏林地．在系统内，大多数元素的输入均大于输出，呈积累趋势．

Purification Effects of Mixed Forest of Pine and Cypress on Acid Rain and Metal Elements in Shiga, Japan

By taking the small watershed of mixed forest of Pine and Cypress in Kiryu nature reserve in Shiga,Japan as the research object,ana the small watershed of sparse forest land in Jakujo nature researve as the comparision,one year's positioned observations have been carried out of the pH values,electrical conductivity,concentration of metal and non-metal elements in precipition,streaming water,through-fall and stein flow.The conclusions are as follows.The ecosystem of the mixed forest and the soil formed from granite has certain purifying effects on acid rain and metal elements,and this ecosystem exerts much more purifying effects than that of the sparse forest land does.The input amount of most elements into the ecosystem is larger than the output and there is a tendency of accumulation of metal elements in the ecosystem.