Warming effects on growth and physiology in the seedlings of the two conifers <Emphasis Type="Italic">Picea asperata</Emphasis> and <Emphasis Type="Italic">Abies faxoniana</Emphasis> under two contrasting light conditions |
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Authors: | Hua Jun Yin Qing Liu Ting Lai |
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Institution: | (1) 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 of China;(3) Center for Ecological Research, Chengdu Institute of Biology, Chinese Academy of Sciences, P.O. Box 416, Chengdu, 610041, People’s Republic of China |
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Abstract: | The short-term effects of two levels of air temperature (ambient and warmed) and light (full light and ca. 10% of full light
regimes) on the early growth and physiology of Picea asperata and Abies faxoniana seedlings was determined using open-top chambers (OTC). The OTC manipulation increased mean air temperature and soil surface
temperature by 0.51°C and 0.34°C under the 60-year plantation, and 0.69°C and 0.41°C under the forest opening, respectively.
Warming, with either full-light or low-light conditions, generally caused a significant increase in plant growth, biomass
accumulation, and stimulated photosynthetic performance of P. asperata seedlings. However, the warming of A. faxoniana seedlings only significantly increased their growth under low-light conditions, possibly as a result of photoinhibition caused
by full light, which may shield and/or impair the effects of warming manipulation, per se, on the growth and physiological
performance of A. faxoniana seedlings. In response to warming, P. asperata seedlings allocated relatively more biomass to roots and A. faxoniana more to foliage under similar environments. This might provide A. faxoniana with an adaptive advantage when soil moisture was not limiting and an advantage to P. asperata if substantial moisture stress occurred. Warming markedly increased the efficiency of PSII in terms of the increase in F
v/F
m and photosynthetic pigment concentrations for the two conifer seedlings, but the effects of warming were generally more pronounced
under low-light conditions than under full-light conditions. On balance, this study suggested that warming had a beneficial
impact on the early growth and development of conifer seedlings, at least in the short term. Consequently, warming may lead
to changes in forest regeneration dynamics and species composition for subalpine coniferous ecosystems under future climate
change. |
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Keywords: | Picea asperata Abies faxoniana Warming Climate change Subalpine coniferous forest |
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