熟畑化過程における雑草植生の変遷に関する研究 : 第5報異なる種類の土壌地帯における雑草群落による熟畑化の指標

概要

論文の詳細を見る
Ordinal numbers from 0 to 5 were assigned to different species of weed according to the degree of resistance to the acidity soil as shown in Table 1. Sum of the ordinal numbers of the weed species found in a square block of 3. 3m^2 in the test area was made regardless of the number of population in each species and it was devided by the number of species employed for the calculation. The value thus obtained was used as "the average reaction index of weed population". RIW. Standard indexes for the soil maturation processes corresponding to p 5 different types of soils were calculated from the relationship between soil acidities and RIW. The results are as follows: Regression equations between RIW and soil acidities were obtained for different types of soils. For the field of relatively old volcanic ash Kuroboku soil, r=0.844^*<**> and y=-3.685+1.449_x; for the relatively new volcanic ash soil, r=0.801^<**> and y=-26.798+9.101X-0.660_<x2>; for the diluvial clay soil, r=0. 762^<**> and y=-32.247+12.24l_x-1 022^<x2>; for the alluvium loam soil, r=0. 6326<**> and y=39.350+13.729_x-1.077_<x2>; and for the sandy soil, r=0.473^* and y=96.562-51.700_x+9.354^<x2>-0.546_<x3>.
日本雑草学会の論文
1977-10-25