Microbial biomass nitrogen pool in soils from a warm temperate grassland,and from deciduous and evergreen forests in Chiba,central Japan |
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Authors: | S. K. Billore M. Ohsawa M. Numata S. Okano |
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Affiliation: | (1) Ecology Laboratory, Faculty of Science, Chiba University, Yayoi-cho, Inage-ku, 263 Chiba, Japan;(2) National Grassland Research Institute, Senbonmatsu, Nishinasuno, 329-27 Tochigi, Japan;(3) Present address: School of Studies in Botany, Vikram University, 456010 Ujjain, M. P., India;(4) Present address: Natural History Museum and Institute of Chiba, 955-2 Aoba-cho, Chuo-ku, 260 Chiba, Japan |
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Abstract: | We evaluated the status of the microbial biomass N pool in grassland, and in deciduous and evergreen forest soils in Chiba, central Japan. Microbial biomass N, a labile fraction of total N in the soil, ranged from 6.96 g N m-2 (15 cm depth) in the grassland to 24.8 g in the deciduous and 20.7 g in the evergreen soils, on a landscape basis. Thus the pattern in the grassland and in the forest soils differed. The N flush measured by a fumigation-incubation method indicated that in the grassland soil microbial biomass N was underestimated by a factor of 2.6 compared with the results from a fumigation-extraction method, because of heavy N immobilization in the microbial biomass. This was in contrast to results from the forest soils, which did not immobilize N. Thus, the forest soils were in a steady-state condition compared with the grassland which formed a seral phase in the ecological succession. Simple correlation coefficients indicated a significant positive relationship between biomass N and organic C in the soil and the N concentration in the litter, the main component of organic matter in the soils of the three ecosystems. |
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Keywords: | Microbial biomass N Litter Grassland Forests Organic carbon N Immobilization Succession |
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