Growth and physiological responses of <Emphasis Type="Italic">Picea asperata</Emphasis> seedlings to elevated temperature and to nitrogen fertilization |
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Authors: | Chunzhang?Zhao Email author" target="_blank">Qing?LiuEmail author |
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Institution: | (1) Ecological Restoration and Rehabilitation Center, Chengdu Institute of Biology, Chinese Academy of Sciences, P. O. Box 416, Chengdu, 610041, People’s Republic of China;(2) Graduate University of the Chinese Academy of Sciences, Beijing, 100039, People’s Republic China |
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Abstract: | Picea asperata is a dominant species in the subalpine coniferous forests distributed in eastern edges of Tibetan Plateau and upper reaches
of the Yangtze River. The paper mainly identified the short-term influences of experimental warming, nitrogen fertilization,
and their combination on growth and physiological performances of Picea asperata seedlings. These seedlings were subjected to two levels of temperature (ambient; infrared heater warming) and two nitrogen
levels (0; 25 g m−2 a−1 N) for 6 months. We used a free air temperature increase of overhead infrared heater to raise both air and soil temperature
by 2.1 and 2.6°C, respectively. The temperature increment induced an obvious enhancement in biomass accumulation and the maximum
net photosynthetic rate, and decreased AOS and MDA level under ambient nitrogen conditions. Whereas, negative effects of experimental
warming on growth and physiology was observed under nitrogen fertilization condition. On the other hand, nitrogen fertilization
significantly improved plant growth in unwarmed plots, by stimulating total biomass, maximum net photosynthetic rate (A
max), antioxidant compounds, as well as reducing the content of AOS and MDA. However, in warmed plots, nitrogen addition clearly
decreased A
max, antioxidant compounds, and induced higher accumulation of AOS and MDA. Obviously, the beneficial effects of sole nitrogen
on growth and physiology of Picea asperata seedlings could not be magnified by artificial warming. |
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Keywords: | Picea asperata Warming Nitrogen Growth Physiological performance |
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