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Plant function and evolutionary biology
RESEARCH ARTICLE

The contrasting leaf functional traits between a karst forest and a nearby non-karst forest in south-west China

Pei-Li Fu https://orcid.org/0000-0001-9092-284X A B E , Shi-Dan Zhu C , Jiao-Lin Zhang A , Patrick M. Finnegan D , Yan-Juan Jiang A , Hua Lin A B , Ze-Xin Fan A B and Kun-Fang Cao C
+ Author Affiliations
- Author Affiliations

A CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Yunnan, 666303, China.

B Ailaoshan Station of Subtropical Forest Ecosystem Studies, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Jingdong, Yunnan, 676209, China.

C Plant Ecophysiology and Evolution Group, State Key Laboratory for Conservation and Utilisation of Subtropical Agro-bioresources and College of Forestry, Guangxi University, Nanning, Guangxi, 530004, China.

D School of Biological Sciences (M084), Faculty of Science, University of Western Australia, 35 Stirling Highway, Perth, WA 6009, Australia.

E Corresponding author. Email: fpl@xtbg.org.cn

Functional Plant Biology 46(10) 907-915 https://doi.org/10.1071/FP19103
Submitted: 15 April 2019  Accepted: 20 May 2019   Published: 26 June 2019

Abstract

Karst and non-karst forests occur in the same region in south-west China, but the soil water and mineral nutrients availability are different between the forests. Our hypothesis was that the leaves of karst trees would be better adapted to dry, nutrient-poor conditions than those of trees in a nearby non-karst forest. We compared the gas exchange, anatomical characteristics and mineral nutrient concentrations in leaves from 21 tree species in a tropical karst forest and 19 species in a nearby non-karst forest in south-west China. We found that the leaves of karst trees had higher P concentrations, photosynthetic capacity and water use efficiency, and greater adaxial and abaxial epidermis thickness than leaves of non-karst forest trees. Evergreen and deciduous trees differed more significantly in leaf functional traits in the karst forest than in the non-karst forest. The leaf palisade : spongy mesophyll thickness ratio was positively correlated with stomatal conductance and negatively correlated with photosynthetic water use efficiency in the karst forest but not in the non-karst forest. Our findings indicate that karst forest trees are more conservative in water use, whereas soil P deficiency could be a major limiting factor for the growth of non-karst forest trees.

Additional keywords: deciduous, evergreen, leaf anatomical traits, leaf P concentration, leaf palisade : spongy mesophyll thickness ratio.


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