1993 Fiscal Year Final Research Report Summary
Fine root biomass and its turn-over rates in forests
| Project/Area Number |
03660153
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
林学
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
TAKEDA Hiroshi Kyoto University, Fac.Agri.Associate Prof., 農学部, 助教授 (60109048)
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| Co-Investigator(Kenkyū-buntansha) |
TOKUCHI Naoko Kyoto University, Fac.Agri.Assistant, 農学部, 助手 (60237071)
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| Project Period (FY) |
1991 – 1993
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| Keywords | Fine root / Chamaecyparis / Turnover rate / Forest ecosystem / Little bag / Mortality rate of root / Fine root biomass / Primary production |
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| Research Abstract |
Annual and seasonal changes in fine root biomass were studied over a 3 year period in a 40 year Chamaecyparis obtusa Endl.forest in Mt.Hiei.Shiga Prefecture, Japan. Amounts of fine root were estimated using the soil core sampling methods. Fine roots consisted of two sizes of roots, i.e.less than 1 mm and 1-3 mm in diameter class. The smaller fine roots were categorized by their morphological characters.
In the moder type soils, the majority of fine root occurred in the surface layr of O-10 cm soil corresponding to the upper mineral soil layr(A layr). In the mor type soils, the majority of fine roots distributed in the soil organic layr(A0-1ayr).
The horizontal distribution of fine roots was independent of the position of trees within the study site, suggested a rather homogeneous distribution of fine roots. Thus, the soil core sampling method were appropriate for the estimation of fine root mass in this study site.
Fine root (size of less than 1 mm )biomass showed seasonal and annual variation over the study period and ranged from 2.0-3.0t/ha. Biomass of fine roots of size above 1 mm ranged from 0.83 - l.3lt/ha. Total fine root mass was estimated to be 2.7-3.9t/ha. Fine root production was estimated by the balance methods and litter bag methods, and was l.32 t/ha. The estimated fine root biomass, and production were compared with other fine root studies in the North American coniferous forests.
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