Regional estimation of potential nitrogen loss from forest soils at the catchment scale

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  • 流域スケールにおける森林土壌からの窒素流出ポテンシャルの推定
  • リュウイキ スケール ニ オケル シンリン ドジョウ カラ ノ チッソ リュウシュツ ポテンシャル ノ スイテイ

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Abstract

We quantified three indices of forest soil N cycling using GIS as an attempt to evaluate potential for forest nitrogen export at the catchment scale. We studied in the forest area with a total area of 134,000ha in basin of the Yahagi River. We used government-published GIS data. We classified the target forest area into seven forest types from vegetation and soil moisture based on GIS data and field research. At typical points of each forest type, we made field researches to measure nitrogen mass in soil profile (<1m). Nitrogen mineralization and nitrification rates of surface soil (0-5cm) were also measured in a laboratory incubation experiment. We estimated soil nitrogen storage to be 1,130,000t, amounts of daily maximum mineralized nitrogen to be 400t N day^<-1> and daily maximum nitrate production to be 200t N day^<-1> in the studied forest area. We made figures showing the distribution of these indices.

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