Dynamics of pH value and metal elements of rainfall within mixed forests in Japanese pine and cypress

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ÂÛÎÄ×÷ÕߣºÁõÔƹú Ôø¹âÃ÷ Y.Katayama K.Nishimura A.Nakanishi H.Okazaki T.Anzai ÀîÐÀ G.Iwazubo

ÎÄÕÂÒ³Â룺549 - 554

Key words£ºmixed forest£» small watershed; small barren watershed; pH value; metal elements

Abstract: The dynamics of forest ecology was studied. The pH values, electrical conductivities and concentrations of metal and nonmetal elements in rainfall, stream, throughª²fall and stream flow were investigated based on the data collected from a small mixed forest watershed of Pinusdensifor a siebet Zucc, Pinus thunbergii Parh and Chamaecypari sobtusa siebet Zuccex Endlat Kiryu nature reserve and a small barren watershed at Jakujo nature reserve, Ootsu, Shiga, Japan. The results show that both the mixed forest ecosystems of pine and cypress and the soil draw from granite affect the pH values and metal elements of rainfall. And the contribution of the mixed forest is greater than that of the barren. Moreover, the amount of input of most elements is larger than that of output in the ecosystem, which shows the elemental accumulation in the r elated forest ecosystem.