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Effects of light availability on leaf attributes and seedling growth of four tree species in tropical dry forest

Ecological Processes 2020年第1期9卷 17-32页

作者： Sachchidanand Tripathi rahul bhadouria Pratap Srivastava Rajkumari S.Devi Ravikant Chaturvedi A.S.Raghubanshi Ecosystems Analysis Laboratory Department of BotanyInstitute of ScienceBanaras Hindu UniversityVaranasi 221005India Department of Botany Deen Dayal Upadhyaya CollegeUniversity of DelhiNew Delhi 110078India Natural Resource Management Laboratory Department of BotanyUniversity of DelhiNew Delhi 110007India Shyama Prasad Mukherjee Post-graduate College University of AllahabadAllahabad 211013India Xishuangbanna Tropical Botanical Garden Chinese Academy of SciencesYunnan 666303China Institute of Environment and Sustainable Development(IESD) Banaras Hindu UniversityVaranasi 221005India

Background:In tropical dry forests,variation in understory light availability due to season and canopy tree density could be a governing factor in establishment and growth of tree *** with varying life history traits are expected to respond differentially to such *** investigated the response of seedlings of four tree species in a tropical day forest in relation to spatiotemporal variability of *** attempt to explore the role of leaf attributes in explaining intra-and inter-specific variations in relative growth *** study sites,each with three contrasting canopy conditions,were selected along a soil moisture *** of four tree species(viz.,Acacia catechu,Bridelia retusa,Lagerstroemia parviflora,and Shorea robusta),varying in life history traits,were monitored for seasonal variations in growth traits across canopy condition and sites for 2 ***:We observed a larger variation in leaf attributes for pioneer *** showed highest mean values for leaf dry matter content,leaf nitrogen concentration,leaf phosphorus concentration,net stomatal conductance,net photosynthetic rate,and relative growth rate in high light *** and *** demonstrated highest mean values for all the leaf attributes(except leaf dry matter content)in low light ***,intermediate values for leaf attributes were observed in *** which preferred moderate light ***:Seasonal variations in light availability at the forest floor appear to play an important role in the establishment and growth of tree seedlings in seasonal dry *** attributes can be used to explain intra-and inter-specific variation in response to light *** attributes in combinations can be used to predict relative growth rate of tree species in tropical dry environment,which apart from soil moisture is also determined by light availability due to seasonal changes and canopy tree density.

关键词： Tropical dry forest Tree seedlings Light intensity Leaf attributes Pioneer species Shade tolerance

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