The effects of enhanced ultraviolet-B and nitrogen supply on growth,photosynthesis and nutrient status of Abies faxoniana seedlings |
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| Authors: | Xiaoqin Yao Qing Liu |
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| Affiliation: | (1) Chengdu Institute of Biology, Chinese Academy of Sciences, P.O. Box 416, 610041 Chengdu, People’s Republic of China;(2) The College of Life Sciences, Hebei University, 071002 Baoding, People’s Republic of China |
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| Abstract: | Abies faxoniana is a key species in reforestation processes in the southeast of the Qinghai-Tibetan Plateau of China. The changes in growth, photosynthesis and nutrient status of A. faxoniana seedlings exposed to enhanced ultraviolet-B (UV-B), nitrogen supply and their combination were investigated. The experimental design included two levels of UV-B treatments (ambient UV-B, 11.02 KJ m−2 day−1; enhanced UV-B, 14.33 KJ m−2 day−1) and two nitrogen levels (0; 20 g N m−2). The results indicated that: (1) enhanced UV-B significantly caused a marked decline in growth parameters, net photosynthetic rate (Pn), photosynthetic pigments and F v/F m, (2) supplemental nitrogen supply increased the accumulation of total biomass, Pn, photosynthetic pigments and F v/F m under ambient UV-B, whereas supplemental nitrogen supply reduced Pn, and not affect biomass under enhanced UV-B, (3) enhanced UV-B or nitrogen supply changed the concentration of nutrient elements of various organs. |
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| Keywords: | Abies faxoniana Nitrogen Nutrient elements Photosynthetic pigments Net photosynthetic rate UV-B |
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