Increased nitrogen deposition alleviated the adverse effects of drought stress on Quercus variabilis and Quercus mongolica seedlings

• Autorzy: Xu N. , Guo W. , Liu J. , Du N. , Wang R.
• Języki publikacji: EN

Abstrakty

EN

The plasticity response of Quercus variabilis and Quercus mongolica seedlings to combined nitrogen (N) deposition and drought stress was evaluated, and their performance in natural niche overlaps was predicted. Seedlings in a greenhouse were exposed to four N deposition levels (0, 4, 8, and 20 g N m-2 year-1) and two water levels (80 and 50 % field-water capacity). Plant traits associated with growth, biomass production, leaf physiology, and morphology were determined. Results showed that drought stress inhibited seedling performance, altered leaf morphology, and decreased fluorescence parameters in both species. By contrast increased N supply had beneficial effects on the nutritional status and activity of the PSII complex. The two species showed similar responses to drought stress. Contrary to the effects in Q. mongolica, N deposition promoted leaf N concentration, PSII activity, leaf chlorophyll contents, and final growth of Q. variabilis under well-watered conditions. Thus, Q. variabilis was more sensitive to N deposition than Q. mongolica. However, excessive N supply (20 g N m-2 year-1) did not exert any positive effects on the two species. Among the observed plasticity of the plant traits, plant growth was the most plastic, and leaf morphology was the least plastic. Therefore, drought stress played a primary role at the whole-plant level, but N supply significantly alleviated the adverse effects of drought stress on plant physiology. A critical N deposition load around 20 g N m-2 year-1 may exist for oak seedlings, which may more adversely affect Q. variabilis than Q. mongolica.

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2015
• Tom: 37
• Numer: 06
• Opis fizyczny: fig.,ref.

Twórcy

autor

Xu N.

• Institute of Ecology and Biodiversity, School of Life Sciences, Shandong University, 27 Shanda Nanlu, Jinan, 250100, People's Republic of China
• Shandong Provincial Engineering and Technology Research Center for Vegetation Ecology, Shandong University, Jinan, 250100, People's Republic of China

autor

Guo W.

• Institute of Ecology and Biodiversity, School of Life Sciences, Shandong University, 27 Shanda Nanlu, Jinan, 250100, People's Republic of China
• Shandong Provincial Engineering and Technology Research Center for Vegetation Ecology, Shandong University, Jinan, 250100, People's Republic of China

autor

Liu J.

• Institute of Environmental Research, Shandong University, Jinan, 250100, People's Republic of China

autor

Du N.

• Institute of Ecology and Biodiversity, School of Life Sciences, Shandong University, 27 Shanda Nanlu, Jinan, 250100, People's Republic of China
• Shandong Provincial Engineering and Technology Research Center for Vegetation Ecology, Shandong University, Jinan, 250100, People's Republic of China

autor

Wang R.

• Institute of Ecology and Biodiversity, School of Life Sciences, Shandong University, 27 Shanda Nanlu, Jinan, 250100, People's Republic of China
• Shandong Provincial Engineering and Technology Research Center for Vegetation Ecology, Shandong University, Jinan, 250100, People's Republic of China
• Institute of Environmental Research, Shandong University, Jinan, 250100, People's Republic of China

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Identyfikatory

DOI

10.1007/s11738-015-1853-4