Рубрики:
BELOW-GROUND BIOMASS
CANADIAN FOREST SECTOR
NET PRIMARY PRODUCTION
CARBON BUDGET MODEL
LEAF-AREA
ROOT BIOMASS
LODGEPOLE PINE
ECOSYSTEMS
EQUATIONS
PRODUCTIVITY
Кл.слова (ненормированные):
allometry -- biomass allocation -- Larix cajanderi -- Larix gmelinii -- permafrost -- Siberia
BELOW-GROUND BIOMASS
CANADIAN FOREST SECTOR
NET PRIMARY PRODUCTION
CARBON BUDGET MODEL
LEAF-AREA
ROOT BIOMASS
LODGEPOLE PINE
ECOSYSTEMS
EQUATIONS
PRODUCTIVITY
Кл.слова (ненормированные):
allometry -- biomass allocation -- Larix cajanderi -- Larix gmelinii -- permafrost -- Siberia
Аннотация: We examined size-mass allometry and biomass allocation of two larch species (Larix gmelinii (Rupr.) Rupr. and Larix cajanderi Mayer) that grow on the continuous permafrost regions in Siberia. Sample tree data (total n = 27) gathered from four mature stands (> 100 years old) were employed for analysis. First, to determine good size predictor of biomass, site-specific allometric relationships (log-linear equation form) were derived between dry mass of four components (stem, branch, needle and coarse root; >= 5 mm in diameter) and seven size variables; stem diameters (breast height, 30 cm height and crown base), sapwood areas (breast height and 30 cm height), and two combined-variables (tree height x dia-diameter). For all components, site-specific allometric equations based on breast-height diameter (D) always gave high correlations as those using other size variables. However, between-stand comparisons of the D-base site-specific allometry indicated that size dependency (i.e., regression slope) differed for stem mass. Besides, needle and coarse root mass for a given size (i.e., regression intercept) differed significantly among the four stands. These facts implied that D-base regression model was reliable for biomass estimation by site-specific allometry, but was not suitable for developing general (i.e., site-common) allometry. Second, to examine carbon allocation pattern, we estimated each stand biomass by applying corresponding site-specific D-base allometry. Stand total biomass ranged from 8.6 to 33.1 Mg ha(-1), and aboveground-total/coarse root biomass ratio (i.e., T/R) ranged from 1.5 to 2.6. The variation was mainly due to trade-offs between stem and root biomass. Average T/R was about 2.3 that was calculated for some reported L. gmelinii and L. cajanderi stands (n = 16), including our four stands. This average T/R was extremely small in comparison to that (5.1) of Scots pine (Pinus sylvestris L.) stands on the non- or discontinuous permafrost regions in Siberia. This finding strongly suggested that the two Larix species invested annual carbon gains largely into root growth. We discussed its ecological implications in relation to stand structure and permafrost soil-N conditions in the larch taiga ecosystem. (c) 2005 Elsevier B.V. All rights reserved.
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Держатели документа:
Kyushu Res Ctr, Forestry & Forest Prod Res Inst, Kumamoto 8600862, Japan
Forestry & Forest Prod Res Inst, Tsukuba, Ibaraki 3058687, Japan
Ryukoku Univ, Fac Intercultural Commun, Otsu, Shiga 5202194, Japan
Russian Acad Sci, VN Sukachev Inst Forest, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Biol Problems Cryolithozone, Yakutsk 677891, Russia
Sakha Minist Nat Protect, Yakutsk 67000, Russia
Tohoku Res Ctr, Forestry & Forest Prod Res Inst, Morioka, Iwate 0200122, Japan
Hokkaido Univ, Boreal Forest Conservat Studies, Sapporo, Hokkaido 0600809, Japan
Доп.точки доступа:
Kajimoto, T...; Matsuura, Y...; Osawa, A...; Abaimov, A.P.; Zyryanova, O.A.; Isaev, A.P.; Yefremov, D.P.; Mori, S...; Koike, T...