Vertical Distribution of Nitrate Nitrogen in Soil Water under Tea Gardens and the Adjacent Forests

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  • 茶園および隣接林地の土壌水中硝酸態窒素の垂直分布
  • チャエン オヨビ リンセツ リンチ ノ ドジョウ スイチュウ ショウサンタイ

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Abstract

Soil water extractors were buried into the soil layer under two gravelly tea gardens and the adjacent forests in Mitake (depth f 0.20 m to 3 m) and Yaga (depth of 0.20 m to 3 m), located in the basin of the River Sakawa Prefecture, in order to take soil water. We measured the concentration of nitrate nitrogen, etc., in soil water and obtained the following results. 1) The concentration of nitrate nitrogen in soil water was, approximately, as follows : under the tea gardens (n×10 mg/l) it was higher than that under the Japanese cypress forest in Mitake (n mg/l) or that under the plum forest in Yaga (n ×10^<-1> mg/l). Its total average was 33.5 mg/l under the tea garden in Mitake, 44.4 mg/l under the tea garden in Yaga, 5.81 mg/l under the Japanese cypress forest in Mitake, 0.20 mg/l under the plum forest in Yaga. 2) The quantity of nitrate nitrogen of soil water at a depth of 0 to 3 m under the tea garden in Mitake was 506 kg/ha and that at a depth of 0 to 2 m under the tea garden in Yaga was 263 kg/ha. We recognized that there was a large quantity of nitrogen, which must be appreciated as a nitrogen resource, under a tea garden. 3) The concentration of nitrate nitrogen in soil water under the Japanese cypress forest in Mitake exceeded 30 mg/l in September at topsoil and its annual average exceeded 5 mg/l at a depth of 3 m. Meanwhile, annual averages of concentration of nitrate nitrogen in soil water under the plum forest in Yaga were 0.16 mg/l and less under a depth of 1 m.

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