Above- and belowground biomass and net primary productivity of a Larix gmelinii stand near Tura, central Siberia

Kajimoto, Tetsuya; Matsuura, Yukiko; Sofronov, M. A.; Volokitina, A. V.; Mori, Shigeta; Osawa, Akira; Abaimov, A. P.

doi:10.1093/treephys/19.12.815

Cited by 118 publications

(78 citation statements)

References 24 publications

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“…The mean root-shoot ratio of our plots was 0.28 in the present study; however, for larch species growing in the permafrost region of Siberia, it ranges from 0.38 to 0.67 irrespective of fine roots [35], when incorporating fine roots it can reach 0.75 [36]. This strongly indicates that the species allocates more biomass to root in colder sites, namely, the root-shoot ratio increases latitudinally [37].…”

Section: Discussioncontrasting

confidence: 62%

Fine Root Biomass and Its Relationship with Aboveground Traits of Larix gmelinii Trees in Northeastern China

Meng

Jia

Zhou

et al. 2018

Forests

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Fine roots play a prominent role in forest carbon flux, nutrient and water acquisition; however, information on fine roots remains scarce due to the limitation of measuring methods. In this study, a nested regression method was used to estimate the biomass and surface area of fine roots of individual Larix gmelinii trees that dominate northernmost China. Aboveground traits including leaf biomass, leaf area, stem volume and aboveground biomass were also investigated. In particular, the relationships between leaves and fine roots, in terms of biomass and area, were examined. The results revealed that allometric models of fine roots, total roots, and leaves consistently fit well with Adj. R 2 = 0.92-0.97. The root-shoot ratio at the individual tree level was approximately 0.28. There were robust positive linear correlations between absorption (fine root biomass, fine root surface area) and production (leaf biomass, leaf area) (Adj. R 2 = 0.95, p < 0.001). In conclusion, the close coupling between fine roots and leaves presented in this study provides support for the theory of functional equilibrium.

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Section: Discussioncontrasting

confidence: 62%

Fine Root Biomass and Its Relationship with Aboveground Traits of Larix gmelinii Trees in Northeastern China

Meng

Jia

Zhou

et al. 2018

Forests

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“…The gradient in nutrient availability among sites is probably also reflected in C allocation among below-and aboveground biomass. For our study region, Kajimoto et al [37] reported that larch trees growing on the poorlydrained and colder soils of TB had a two-fold higher root-to-shoot ratio (1.13) in comparison to sites with a deeper active layer depth (i.e., <0.5). Such patterns are likely explained by an increasing competition belowground for accessible resources within a limited soil volume.…”

Section: Nutrient Status Of Larch Improves With Active Layer Depthmentioning

confidence: 77%

Permafrost Regime Affects the Nutritional Status and Productivity of Larches in Central Siberia

Prokushkin

Hagedorn²,

Pokrovsky

et al. 2018

Forests

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Permafrost exerts strong controls on forest development through nutrient availability. The key question of this study was to assess the effect of site conditions on macroelement concentration and stable isotope (δ 13 C and δ 15 N) dynamics during the growing season, and nutrient stoichiometry and resorption efficiency in the foliage of two common larch species in Siberia. Foliar nutrient (N, P and K) concentrations of larches grown on permafrost soils were exceptionally high in juvenile needles compared to those from a permafrost-free region (+50% and 130% for P and K), but were two-fold lower at needle maturation. Within permafrost terrain trees, sites with a warmer and deeper soil active layer had 15-60% greater nutrient concentrations and higher δ 15 N in their needles compared to shallower, colder soils. Larch of permafrost-free sites demonstrated an enrichment of foliage in 15 N (+1.4% to +2.4 ) in comparison to permafrost terrain (−2.0% to −6.9 ). At all sites, foliar δ 13 C decreased from June to August, which very likely results from an increasing contribution of current photoassimilates to build foliar biomass. With senescence, nutrient concentrations in larch needles decreased significantly by 60-90%. This strong ability of larch to retain nutrients through resorption is the essential mechanism that maintains tree growth early in the growing season when soil remains frozen. The high resorptive efficiency found for K and P for larches established on permafrost suggests nutrient limitation of tree growth within the Central Siberian Plateau not only by N, as previously reported, but also by P and K. The increasing nutrient concentrations and a 15 N enrichment of foliage towards warmer sites was paralleled by an up to 50-fold increase in biomass production, strongly suggesting that accelerated nutrient cycling with permafrost degradation contributes to an increased productivity of Siberian larch forests.

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“…The latter accounts for the dominant part of the net primary productivity P 1 (g C m −2 per year) (Whittaker and Marks, 1975;Kajimoto et al, 1999). The turnover time τ 1 of the metabolically active plant biomass can be therefore estimated as τ 1 ≈ B 1 /P 1 .…”

Section: Discussionmentioning

confidence: 99%

Body size, energy consumption and allometric scaling: a new dimension in the diversity?stability debate

Makarieva

2004

Ecological Complexity

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A new theoretical approach is developed that links the allometry of energy partitioning among differently-sized organisms in ecological community to community stability. The magnitude of fluctuations of plant biomass introduced by plant-feeding heterotrophs is shown to grow rapidly with increasing body size. To keep these fluctuations at a low level compatible with ecosystem stability, the share of ecosystem primary productivity claimed by plant-feeding heterotrophs should decrease with increasing body size. In unstable environments the ecological restrictions on biotic fluctuations are lessened and net primary productivity can be distributed more evenly among differently sized organisms. Within the developed approach it is possible to quantitatively estimate not only the scaling exponents in the dependence of population density and biomass of heterotrophs on body size, but also the absolute values of energy fluxes claimed by organisms of a given size in stable communities. Theoretical predictions are tested against diverse sets of empirical data. It is shown that in stable ecological communities the largest heterotrophs are allowed to consume no more than several tenths of percent of net primary productivity.

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Above- and belowground biomass and net primary productivity of a Larix gmelinii stand near Tura, central Siberia

Cited by 118 publications

References 24 publications

Fine Root Biomass and Its Relationship with Aboveground Traits of Larix gmelinii Trees in Northeastern China

Fine Root Biomass and Its Relationship with Aboveground Traits of Larix gmelinii Trees in Northeastern China

Permafrost Regime Affects the Nutritional Status and Productivity of Larches in Central Siberia

Body size, energy consumption and allometric scaling: a new dimension in the diversity?stability debate

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