A METHOD OF CAPABILITY EVALUATION FOR UPLAND SOILS : V.Prediction of Potential Erodibility

概要

論文の詳細を見る
Utilizing the data and materials accumulated in the project "Observations on Soil Fertility Changes" organized by Ministry of Agriculture and Forestry and executed by 16 Prefectural Agricultural Experiment Stations throughout Japan, an attempt was made to derive a prediction equation for soil loss due to erosion. Five Prefectural Agricultural Experiment Stations provided us with rainfall records from which monthly rainfalls by three intensity grades, under 2 mm/10 min(LE2R), 2-4 mm/10 min(MEDR), and over 4 mm/10 min(GT4R), were read. Multiple regression of log-transformed soil loss upon these rainfall data gave the following regression equation; Log(soil loss)=-0.788+0.0185^<**>GT4R+0.00597^<**>LE2R+0.00763^<**>MEDR for which multiple correlation coefficient(R) was 0.74. The units of measurement were kg/are for soil loss and mm/month for LE2R, MEDR, and GT4R. In order to account for the contribution of slope and soil factors to soil loss, Hayashi's theory of quantification No.1 was applied after coding the relevant data. R of log-transformed soil loss on GT4R, MEDR, LE2R, slope, bulk density(BD), and texture(TEXT), reached 0.80. GT4R had the highest partial correlation coefficient, followed successively by MEDR, slope, and LE2R. Bulk density(BD) and texture(TEXT) were taken from among the data available to represent soil characters relevant to erosion, but they had only low partial correlations with soil loss in this particular study. The method developed in this study appears to be promising only if properly collected data are available. Conditions that should be satisfied in the planning of experiments for the purpose of derivation of a prediction equation have been put forward.
社団法人日本土壌肥料学会の論文

A METHOD OF CAPABILITY EVALUATION FOR UPLAND SOILS : V.Prediction of Potential Erodibility

スポンサーリンク

概要

著者

関連論文

スポンサーリンク