ジャカルタ郊外集落内の小規模池（ コラム） の分布・利用実態と消失リスクに関する研究

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  • Study regarding distribution, usage conditions, and disappearance risks of small pond (Kolam) in peri-urban areas of Jakarta
  • ジャカルタ コウガイ シュウラク ナイ ノ ショウキボチ(コラム)ノ ブンプ ・ リヨウ ジッタイ ト ショウシツ リスク ニ カンスル ケンキュウ

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This study was conducted in Poris Gaga which is a peri-urban village of Jakarta. We investigate the distribution and conditions of small ponds (Kolam). Kolam was classified using by DCA and cluster analysis with 106 existing ponds and subjects of usage conditions. In the result, there were a total of 119 ponds. Among them, only 45 ponds are used, 53 ponds are deserted and 21 ponds have already disappeared. Most of utilization purpose of Kolam are fish farming, and other top of purpose is domestic water storage mainly to household effluent, but some Kolams have a plural role. The water level of rainy season is different from dry season. The result shows Axis 1 of DCA is heavily correlated with Using condition and Application of Water storage of household effluent, and correlated with Presence of dumping garbage and inflow of household effluent. Axis 2 is strongly correlated with Application of Cultivation, and correlated with Application of Irrigation. Kolams were classified into 4 groups according to DCA scores by cluster analysis. We identified the disappearance risks of Group1 and Group3 are higher, because most disappeared Kolams were classified in these. And water quantity of Group3 and Group1 is less than others.

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