Water transport of native and exotic tree species in relation to xylem anatomical characteristics in low subtropical China  

作　　者：Yanting Hu Jianguo Gao Ping Zhao Weijun Shen Peiqiang Zhao Liwei Zhu Guangyan Ni Junfeng Niu Lei Ouyang 

机构地区：[1]Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems,South China Botanical Garden,Chinese Academy of Sciences,Xingke Road 723,Tianhe District,Guangzhou 510650,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Guangdong Provincial Key Laboratory of Applied Botany,South China Botanical Garden,Chinese Academy of Sciences,Guangzhou 510650,China

出　　处：《Journal of Plant Ecology》2018年第3期423-433,共11页植物生态学报（英文版）

基　　金：This study was financially supported by the National Natural Science Foundation of China(Grant No.41630752,31130011,41030638,31300335);the CAS/SAFEA International Partnership Program for Creative Research Teams.

摘　　要：Aims Exotic fast-growing tree species have been commonly planted as pioneer species to facilitate ecological restoration in South China.Their growth and resource utilization behavior related to intrinsic physiology and structural properties have profound influences on forest ecosystem.However,the contrastive research focusing on water utilization features along with xylem anatomical properties between native and exotic species is scarce in South China.The objective of this study is to investigate the sapwood anatomical characteristics and water utilization conditions of native and exotic fast-growing species,and to elucidate the relationship between sap-flux density and conduit features.Methods We measured sap-flux density,conduit length,diameter and density of four native species(Schima superba,Michelia mac-clurei,Castanopsis hystrix and Castanopsis fissa)and four exotic species(Eucalyptus citriodora,Eucalyptus urophylla×grandis,Acacia auriculaeformis and Acacia mangium).Sap flux density was measured based on the Granier’s thermal dissipation probe method.The whole-tree water transport was quantified by mul-tiplying sap-flux density by sapwood area.The measurements of conduit characteristics were conducted by using segregation and slice method.Important Findings Sapwood area increased with the growing diameter at breast height(DBH)as a power function.Native species had a larger water-conducting tissue area than exotic species at the same DBH value when trees grew to a size with a certain value of DBH.The con-duit diameter of exotic species was significantly larger than that of native species.Conversely,native species,such as S.superba and M.macclurei,had longer conduit length and higher conduit den-sity than other tree species.Based on a physiological interpretation of the measured conduit characteristics,native tree species devel-oped a safe water transport system while exotic fast-growing tree species come into being an efficient system instead.Water trans-port increased with the growing DBH as a power func

关 键 词：sap-flux density conduit characteristics sapwood area water transport 

分 类 号：S78[农业科学—林学]