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《Ecological Science》 2008-03
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Leaf longevity of main evergreen tree species of Guiyang City

ZHOU Zi-zong,YUAN Li,WANG Zhen-hong Life Scientific College of Guizhou University,Guiyang 550025,China  
The typical vegetation coverage in Guiyang is Karst vegetation,among which Karst evergreen conifer forest,Karst evergreen broadleaf forest and Karst evergreen shrubs are of great significance on the local ecological system.This research investigated the leaf longevity of main evergreen tree species of Guiyang Karst vegetation by taking the dominant species and companion species as the main objects in varied life-form species and computing the average life expectancy(Ex) based on life-table method.The results are as follows: ① The leaf lifespan of evergreen tree species mostly ranged from 0 to 2 years,with large variation and different replacing periods of every tree species.② Difference in leaf lifespan of varied life-form species exsited.Average leaf lifespan was relatively longer in small trees and shrubs than in large trees,but was not significantly different.③The species leaf lifespan was obviously different in varied forms of vegetation.Reckoning with the speciality of vegetation in Guiyang,the present study discussed the influencing factors of leaf lifespan and concluded that the leaf lifespan had its own specific scatter pattern in Guiyang.
【Fund】: 贵州省自然科学基金(黔科合J字[2005]2025号);; 黄土高原土壤侵蚀与旱地农业国家重点实验室基金(10501-161);; 贵州大学人才基金(2003F00bs002)资助
【CateGory Index】: Q948
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