島根大学生物資源科学部研究報告

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島根大学生物資源科学部研究報告 19
2014-09-30 発行

三瓶演習林およびその周辺における森林渓流水質の空間的変化

Spatial variation in streamwater chemistry in forested watershed around the Sambe Forest, Shimane University
西本 侑未
葛西 絵里香
ファイル
内容記述(抄録等)
Streamwater chemistry was investigated at 24 collection points in three catchments (one broadleaf forest and two coniferous plantations ) around the Sambe Forest.Na^+ and CL^- concentrations were relatively uniform among the streams and higher than Japan's average, probably due to the influence of sea salt. Mean Ca^2+ and Si concentrations were higher in the coniferous rate in soils were greater in the coniferous plantations. Relatively high concentration of NO_3- was observed in the streamwater in the coniferous plantations. Maximum No_3- concentration from one coniferous plantation was comparable to that from urban forests where anthropogenic disturbance in N cycling was concerned. Contrary, NO_3- concentration from the broadleaf forest was much lower than Japan's average, and higher retention capacity of atmospheric N deposition can be expected in this broadleaf forest. Concentrations of Mg^2+, Ca^2+, NO_3- and HCO_3- decreased downstream in the coniferous plantations, while those in upstream water varied among the stream.