スギ,ヒノキ林の土壌浸透水の養分組成

概要

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The soil percolating water from sugi (Cryptomeria japonica D. Don), hinoki (Chameaesiparis obtusa S. et Z.) and broadleaf stands was collected and analyzed throughout two years. The results obtained were as follows. 1) The pH of the percolating water was 4 to 5 except a 165-year-old stand, and lower than the soil pH(H_2O), but seasonal variation was observed. The pH of the surface horizon was lower by 0.3 to 0.5 than that of the subsoil. 2) In the sugi and the hinoki stands, nitrate ion comprises 60 to 70% of the total anion in the percolating water. This suggests that nitrate ion liberated by the mineralization of organic nitrogen controlled the salt concentration of the soil percolating water. Nitrate ion concentration in the broadleaf stand was one-several decades of that in the conifer stand. 3) The calcium occupied more than 60% of the total cations of the soil percolating water in the sugi stand and about 40% in the hinoki stand, whereas magnesium, potassium and sodium were about 20% respectively in both stands. 4) The cation and anion concentration in the percolating water increased with the increasing age of sugi stands from a young to an established stand. 5) The main ion pairs in the percolating water was considered as calcium nitrate in the sugi and the hinoki stands, but sodium chloride in the broadleaf stand.
社団法人日本土壌肥料学会の論文
1993-04-05