森林小流域からの窒素流出に影響をおよぼす渓流流量と土壌温度 : 森林小流域からの栄養塩類流出に関する研究(第1報)

概要

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Nitrogen efflux at a small forested catchment was continuously observed in 1990 and 1991 in Hirusen Experimental Forest of Tottori University, Okayama Prefecture, Japan. The mean concentration of nitrogen in stream water was O.88mg L^<-1> and that of inorganic nitrogen was 0.09 mg L^<-1>. More than 60% of the nitrogen in stream water was the soluble organic form. Nitrogen efflux correlated with the discharge rate (γ=0.946^<**>). When the nitrogen efflux was less than 10 mgs^<-1>, the observed nitrogen efflux was greater than the estimated nitrogen efflux from mid-May to early September, but the observed nitrogen efflux was less than the estimated nitrogen efflux from mid-September to early May. It was suggested that the processes of nitrogen effluence in this catchment might have shown a difference between these 2 seasons. Direct flow, throughflow and base flow were divided by a hydrograph separation method. Multiple regression analysis suggested that direct flow and throughflow increased nitrogen efflux during and after storm events. The multiple regression model slightly improved the accuracy of nitrogen efflux estimation compared to the L-Q model. It was suggested that changes of hydrologic pathways strongly influenced the variation of nitrogen efflux from this catchment.
社団法人日本土壌肥料学会の論文
1995-08-05