黒ボク土(黒色土)の諸特性に及ぼす植栽樹種の影響

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The physical , chemical and micromorphological properties of surface soils under the tree garden and the nursery garden in Sugadaira Montane Research Center, University of Tsukuba, Central Japan were studied. Species of the four stands in the tree garden were Abies veichii, Chamaecyparis obtusa , Larix leptolepis and Betula ermanii, Soil was Ando Soil originated from volcanic ash, and the color of surface soil was black (7.5YR1.7/1) to dark brown (7.5YR3/3). Bulk density of surface soil under Abies and Chamaecyparis stands were 0.33 (g・ml^<-1>) , and that in the nursery garden was 0.50 (g・ml^<-1>). The values of 24hr water holding capacity in the tree garden were higher than that in the nursery garden. pH values in the tree garden indicated more acidic than that in the nursery garden. Exchange acidity (Y_1 was highest under Abies stand, and lowest in the nursery garden. RF values of humic acid fraction were higher in the nursery garden than in the tree garden. The type of humic acid determined from absorption spectra was A type except under Chamaecyparis stand. Microstructure of surface soils in the tree garden were crumb and granular structure under Abies and Chamaecyparis stands, and were subangular blocky structure under Larix and Betula stands. Large amounts of plant residues and excrements pedofeatures were found in the thin sections of soil samples under Abies , Chamaecyparis and Betula stands. In the nursery garden, however, those were very few. From these results, it is apparent that properties of surface soils in the tree garden were different from in the nursery garden. These suggest that afforestation affects soil environment, and characteristics of the surface soils vary, and that biological activity in soil under afforested stands is higher than under an upland field such as the nursery garden.
森林立地学会の論文
1991-12-30

黒ボク土(黒色土)の諸特性に及ぼす植栽樹種の影響

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