Photosynthetica 2009, 47(2):298-303 | DOI: 10.1007/s11099-009-0046-z

Occurrence and altitudinal pattern of C4 plants on Qinghai Plateau, Qinghai province, China

M.C. Li1,2,3,*, J.J. Zhu1, L.X. Li3
1 Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China
2 Tianjin Climate Center, Tianjin, China
3 Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China

The natural occurrence and altitudinal pattern of species with C4 photosynthesis were investigated on Qinghai Plateau, Qinghai province by using stable carbon isotopes in plant leaves and using additional data from references. A total of 58 species belonging to 10 families and 34 genera were identified using C4 photosynthetic pathway, which is only 1.66 % of total 3 500 plant species in Qinghai province. The leading two families, i.e. Gramineae (23 species) and Chenopodiaceae (22 species) contain 77.6 % of all C4 plants in the studied area. The number of C4 species increased from 1 600 to 2 400 m a.s.l. and then decreases quickly till 4 400 m a.s.l. with one half of C4 species distributing from 2 200 to 2 800 m a.s.l. (48 %). Eight plant species were found above 4 000 m a.s.l., but the distribution of these species is limited to the south of Qinghai province (low latitude area) where annual mean temperature is above 0 °C, suggesting that low temperature may generally limit the distribution of C4 plants.

Additional key words: altitude distribution; C4 species; δ13C; Qinghai Plateau

Received: November 27, 2008; Accepted: June 1, 2009; Published: June 1, 2009  Show citation

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Li, M.C., Zhu, J.J., & Li, L.X. (2009). Occurrence and altitudinal pattern of C4 plants on Qinghai Plateau, Qinghai province, China. Photosynthetica, 47(2), 298-303. doi: 10.1007/s11099-009-0046-z
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