Permafrost Regime Affects the Nutritional Status and Productivity of Larches in Central Siberia : сборник научных трудов

Тип публикации: статья из журнала

Год издания: 2018

Идентификатор DOI: 10.3390/f9060314

Ключевые слова: permafrost, Siberian Larix spp, foliar nutrients, foliar C-13 and N-15, spatio-temporal variation, stoichiometry, nutrient resorption, Foliar δ13C and δ15N, Siberian Larix spp.

Аннотация: 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 (C-13 and N-15) 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 N-15 in their needles compared to shallower, colder soils. Larch of permafrost-free sites demonstrated an enrichment of foliage in N-15 (+1.4% to +2.4 parts per thousand) in comparison to permafrost terrain (-2.0% to -6.9 parts per thousand). At all sites, foliar C-13 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 N-15 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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Издание

Журнал: FORESTS

Выпуск журнала: Vol. 9, Is. 6

Номера страниц: 314

ISSN журнала: 19994907

Место издания: BASEL

Издатель: MDPI

Авторы

  • Prokushkin Anatoly S. (VN Sukachev Inst Forest SB RAS, Akademgorodok 50-28, Krasnoyarsk 660036, Russia)
  • Hagedorn Frank (WSL, Zurcherstr 111, CH-8903 Birmensdorf, Switzerland)
  • Pokrovsky Oleg S. (Univ Paul Sabatier, CNRS, IRD, GET, 14 Ave Edouard Belin, F-31400 Toulouse, France)
  • Viers Jerome (Univ Paul Sabatier, CNRS, IRD, GET, 14 Ave Edouard Belin, F-31400 Toulouse, France)
  • Kirdyanov Alexander V. (VN Sukachev Inst Forest SB RAS, Akademgorodok 50-28, Krasnoyarsk 660036, Russia)
  • Masyagina Oxana V. (VN Sukachev Inst Forest SB RAS, Akademgorodok 50-28, Krasnoyarsk 660036, Russia)
  • Prokushkina Marina P. (Siberian Fed Univ, Svobodny 79, Krasnoyarsk 660041, Russia)
  • McDowell William H. (Univ New Hampshire, Dept Nat Resources & Environm, Durham, NH 03824 USA)

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