スギ林における土壌溶液の化学組成の空間分布

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The spatial distribution of soil solution chemistry was investigated in a 40 years-old Japanesecedar stand of 0.25 ha with a slop of 20°. This area was divided into 25 systematic plots of 10m×10m, and at each plot soil solutions were sampled from depths of 10cm and 100cm with ceramicsuction lysimeters on three dates in August, September and October 2000. The solutions wereanalysed for major cations and anions.The results obtained were follows : 1) The dominant ion species for soil solutions at the depth of 10cm (referred to as 10cm samples) and 100cm (referred to as 100cm samples) were NO_3^- and Ca^<2+>. NO_3^- concentration for 10cm samples was always higher than the sum of NO_3^- and NH_4^+ concentration for throughfall. This suggests that mineralization of organic nitrogen followed by nitrification occurred in all plots within the slope. High NO_3^- concentration for 100cm samples would be caused by insufficient uptake of NO_3^- generated in surface soil.2) Highest variations were observed for H^+ and HCO_3^- for 10cm samples, and for K^+ and SO_4^<2-> for 100cm samples. For 10cm samples, higher H^+ and lower HCO_3^- concentration was observed at plots located in the upper slope. On the other hand, K^+ and SO_4^<2-> concentration for 100cm samples had random distribution within the slope.3) In most plots, ion concentration for 10cm samples was the most lowest in September when heavy rain occurred. In contrast, the temporal variation of ion concentration for 100cm samples was smaller than that for 10cm samples. In the concave plots, however, a larger temporal variation of NO_3^-, Cl^- , Ca^<2+> and Mg^<2+> concentration was observed. This must have been mainly because the ratio of verticalflow and throughflow coming into the concave plots was changed by precipitation strength.
社団法人日本土壌肥料学会の論文
2001-12-05

スギ林における土壌溶液の化学組成の空間分布

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