4.7 Article

Effects of calcium on seed germination, seedling growth and photosynthesis of six forest tree species under simulated acid rain

Journal

TREE PHYSIOLOGY
Volume 31, Issue 4, Pages 402-413

Publisher

OXFORD UNIV PRESS
DOI: 10.1093/treephys/tpr019

Keywords

acid rain sensitive; acid rain tolerant; chlorophyll content; leaf calcium content; photosynthesis rate; tree species

Categories

Funding

  1. Natural Science Foundation of China (NSFC) [30930076, 30770192, 30670317, 30271065, 39970438]
  2. Foundation of the Chinese Ministry of Education [20070384033]
  3. Program for New Century Excellent Talents at the Xiamen University [NCETXMU X071l5]
  4. Changjiang Scholarship [X09111]
  5. Direct For Biological Sciences
  6. Division Of Integrative Organismal Systems [848263] Funding Source: National Science Foundation

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We selected six tree species, Pinus massoniana Lamb., Cryptomeria fortunei Hooibr. ex Otto et Dietr., Cunninghamia lanceolata (Lamb.) Hook., Liquidambar formosana Hance, Pinus armandii Franch. and Castanopsis chinensis Hance, which are widely distributed as dominant species in the forest of southern China where acid deposition is becoming more and more serious in recent years. We investigated the effects and potential interactions between simulated acid rain (SiAR) and three calcium (Ca) levels on seed germination, radicle length, seedling growth, chlorophyll content, photosynthesis and Ca content in leaves of these six species. We found that the six species showed different responses to SiAR and different Ca levels. Pinus armandii and C. chinensis were very tolerant to SiAR, whereas the others were more sensitive. The results of significant SiAR x Ca interactions on different physiological parameters of the six species demonstrate that additional Ca had a dramatic rescue effect on the seed germination and seedling growth for the sensitive species under SiAR. Altogether, we conclude that the negative effects of SiAR on seed germination, seedling growth and photosynthesis of the four sensitive species could be ameliorated by Ca addition. In contrast, the physiological processes of the two tolerant species were much less affected by both SiAR and Ca treatments. This conclusion implies that the degree of forest decline caused by long-term acid deposition may be attributed not only to the sensitivity of tree species to acid deposition, but also to the Ca level in the soil.

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