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Growth and photosynthetic responses of two coniferous species to experimental warming and nitrogen fertilization

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The paper studied the short-term effects of experimental warming, nitrogen fertilization, and their combination on growth and photosynthetic performances of Picea asperata Mast. and Pinus tabulaeformis Carr. seedlings. These seedlings were subjected to two levels of temperature (ambient temperature and infrared heater warming) and two nitrogen levels (0 and 25 g N·m–2·year–1) for 6months. Warming alone and fertilization alone significantly increased biomass accumulation and photosynthetic performances of both two species. The combination of warming and fertilization stimulated greater accumulation of stem, root, and total biomass and further increased chlorophyll content and net photosynthesis rate (A) in Pinus tabulaeformis seedlings. However, for Picea asperata seedlings, the interaction induced less increment in plant height, total biomass, chlorophyll contents, A, and the efficiency of photosystem than nitrogen treatment alone. These results implied that both climate warming and nitrogen addition were favorable for the early growth of both coniferous species; the interaction of these two factors caused adding or multiplying single-factor effects in the case of Pinus tabulaeformis seedlings but dampening them in the case of Picea asperata seedlings, at least in short time.

Cet article traite des effets à court terme d’un réchauffement expérimental, d’une fertilisation azotée et de la combinaison de ces deux traitements sur la croissance et les performances photosynthétiques des semis de Picea asperata Mast. et de Pinus tabulaeformis Carr. Les semis ont été soumis à deux niveaux de température (température ambiante et réchauffement avec un émetteur infrarouge) et deux niveaux d’azote (0 et 25 g N·m–2·an–1) pendant 6 mois. Le réchauffement ou la fertilisation ont chacun significativement augmenté l’accumulation de biomasse et les performances photosynthétiques chez les deux espèces. Combinés, le réchauffement et la fertilisation ont provoqué une plus grande accumulation de la biomasse de la tige, des racines et totale et ont augmenté encore plus le contenu en chlorophylle et le taux net de photosynthèse (A) chez les semis de Pinus tabulaeformis. Cependant, chez les semis de Picea asperata, la combinaison des deux traitements a produit une moins grande augmentation de la hauteur des plants, de la biomasse totale, du contenu en chlorophylle, du taux net de photosynthèse (A) et de l’efficacité du PSII que la fertilisation azotée seule. Ces résultats impliquent que le réchauffement du climat et l’apport d’azote ont été bénéfiques pour la croissance initiale des deux espèces de conifère. L’interaction de ces deux facteurs a causé une addition ou une multiplication des effets de facteurs uniques dans le cas des semis de Pinus tabulaeformis mais une atténuation dans le cas des semis de Picea asperata, du moins à court terme.

Document Type: Research Article

Publication date: January 1, 2008

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