瀬戸内島嶼部樹園地地帯における表流水と貯留水の水質特性 : 中島本島を事例として

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This paper deals with the characteristics of water quality in rivers and reservoirs in Nakajima Island, which is located in the western part of Seto Inland Sea, in order to develop self-reliant water resources. Nakajima Island is mountainous with steep sloping granitic soil and the greater part of land is used for the orchard. Nutrient salts (T-N, NO_3-N,NO_2-N, NH_4-N, T-P, PO_4-P), pH, Cl^-, EC, Fe, and Mn were measured once a month from December 1998 to November 1999. At the same time, the amount of fertilization on the orchard was investigated to reveal the affect on water qualities. The major results are as follows ; 1) The concentrations of nitrogen both in rivers and reservoirs are high in May and October, due to the spring and autumn fertilizations. Especially, the intensive fertilization in early and middle autumn makes the concentration to be the highest level in October. 2) The averaged concentrations of nitrogen and phosphorus in each study area are related to the ratio of the orchard area to the study area. 3) The concentrations of nitrogen and phosphorus in reservoirs are less than those in rivers. Moreover, the concentrations in reservoirs with water plants are lower than those in the other reserviors.
日本雨水資源化システム学会の論文