京都大学芦生演習林の土壌調査報告 (第2報) : 土壌型と粒径組成, 理化学的性質について

Abstract

京都大学芦生演習林のほぼ全域で土壌を調査した。土壌の断面を調査した地点数は101で, このうち63地点の土壌については深さ別に粒径組成, 化学的性質, 理学的性質を測定した。これらの結果から, 1. 調査した地点の89%は褐色森林土で, 残り11%がポドゾルであった。2. 褐色森林土の大部分はB_D型土壌であったが, B_A, B_B, BC, B_E型土壌も認められた。3. ポドゾルでは, P_D, P_<w(i)>, P_<w(h)>亜群が認められた。4. B_A, B_B, B_C型土壌は一般に酸性が強く, 養分要素の含有率が低く, 容積重が大きい傾向が認められた。5. B_D, B_E型土壌は一般に酸性が弱く, 養分要素の含有率が高く, 容積重が小さい傾向が認められた。6, P_D, P_<w(i)>, P_(w(h)>亜群は一般に酸性が強く, 養分要素の含有率が高く, 容積重が大きい傾向が認められた。

In order to make clear the properties of the forest soils in the Kyoto University Forest in Ashiu, the forest was surveyed covering almost its whole area. Of the 101 points surveyed for soil profiles, mechanical analysis, chemical and physical properties of the soil were measured for 63 points. The results were as follows : 1. 89% of the points surveyed was brown forest soil, the other 11% was podozolic soil. 2. Almost all points of brown forest soil were of BD type but BA, BB, BC and BE types were also found. 3. PD, PW(i) and PW(h) types were found in podozolic soil. 4. In general, BA, BB and BC type soils were found to be low in pH, poor in nutrient content and showed heavy volume weight. 5. BD and BE types, in general, were found to be high in pH, somewhat high in nutrient content and showed light volume weight. 6. PD, PW(i) and PW(h) types, in general, were found to be somewhat low in pH, slightly high in nutrient content and showed somewhat heavier volume weight.