Plant Diversity ›› 2011, Vol. 33 ›› Issue (6): 595-604.doi: 10.3724/SP.J.1143.2011.11067

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Leaf Traits of Orchids in Relation to Life Form in Karst Area of Southwestern China

 CHENG  Xiao-Feng-1、2, LI  Shu-Yun-1, HU  Hong-1   

  1. 1 Key Laboratory of Economic Plants and Biotechnology, Kunming Institute of Botany, Chinese Academy of Sciences,
    Kunming 650201, China; 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China;
    3 Yachang Orchids Nature Reserve in Guangxi, Baise 533209, China
  • Received:2011-04-19 Online:2011-12-25 Published:2011-06-08

Abstract:

Leaf traits can reflect the adaptation of plants to environments. Understanding leaf traits of orchids and their adaptive implications in karst area of southwestern China is contributive to the conservation for those endangered orchids. Leaf traits of 19 orchids and their correlations in Guangxi Yachang Orchids Nature Reserve were studied in both dry season and rainy season. Only Oberonia myosurus was CAM plant and its stomata distribution was amphistomaty. Other orchids were C3 plants and their stomata distributions were hypostomaty. Compared with deciduous orchids,evergreen orchids had higher leaf mass per area (LMA) and ratio of leaf carbon to leaf N (C/N), lower leaf N and P content. For the evergreen orchids, lithophytic orchids showed higher leaf Ca content and leaf δ13C than did terrestrial orchids. Leaf P content of evergreen lithophytic orchids in rainy season was higher than in dry season. Leaf δ13C of terrestrial orchids in dry season was higher than in rainy season. The value of N/P in evergreen orchids showed that these orchids in karst area might suffer the limitation of phosphorus.

Key words: Orchid, Leaf trait, Leaf phosphorus content, Leaf carbon isotope, Seasonal change

CLC Number: 

  • Q 944