제주지역 농경지 이용유형별 토양 탈수소효소활성과 미생물체량

Abstract

This study was carried out to evaluate the soil dehydrogenase activity and microbial biomass C with soil type and land use in cropland of JeJu region. Soil chemical properties, dehydrogenase activity, and microbial biomass C were analyzed after sampling from upland (50 sites), orchard (50 sites), paddy (30 sites), horticultural facility (30 sites) in March. Average pH values was at 6.3 in upland soil, however soil chemical properties showed a large spatial variations in both orchard and horticultural facility soil. The Zn and Cu contents increased by the continuous application of pig manure compost in some citrus orchard soil. Soil dehydrogenase activity and microbial biomass C were higher in non-volcanic ash than in volcanic ash soil regardless of land use type. Soil dehydrogenase activity was two to four times higher in upland than in the others. It was at 38.7 ug TPF in non-volcanic ash of upland soil. Microbial biomass C content was very high in horticultural facility soil and it showed at 216.8 in non-volcanic ash. Soil dehydrogenase activity showed a positive correlation with organic matter (=0.59), Zn (=0.65), and Cu (=0.66) in non-volcanic ash horticultural facility soil. There was a negative correlation (=0.57) between soil organic matter and dehydrogenase activity in volcanic ash upland soil.