应用生态学报2017，Vol.28Issue(8)：2431-2437,7.DOI:10.13287/j.1001-9332.201708.013
喀斯特出露基岩生境两种典型乔木的树干液流特征
Characteristics of sap flow of two typical trees in exposed bedrock habitat of Karst region,China
摘要
Abstract
A unique but very common habitat,rocky outcrop in Karst region of southwest China was selected for this study.Sap flow patterns of two typical tree species (Radermachera sinica and Triadica rotundifolia) were analyzed by using the method of Granier's thermal dissipation probe (TDP).The results showed that sap flow density of both species exhibited clear response to the wet and dry seasons.However,the absence of sap flow only last about 1 month for R.sinica but 4 months for T.rottndifolia,despite the same functional type of these two species.T.rotundifolia consumed relatively higher annual total amount of water per unit area at breast height than R.sinica.Moreover,water that was consumed during the growing season (from April to September) accounted for 90％ and 66％ of the annual total amount for T.rotundifolia and R.sinica,respectively.Sap flow densities of the two species were very significantly positively correlated with photosynthetically active radiation,water vapor pressure deficit,and temperature,while had very significant negative correlation with air relative humidity.Sap flow densities and daily water consumptions of two tree species were not only lower than the tree species distributed in the same climatic non-karst zone of the study area,but also lower than the main tree species in karst area nearby,and even lower than the typical species in dry area with extremely low precipitation.The above results suggested that water consumption of the two tree species were restricted by the specific water environment of rocky outcrop,and species of the same functional type exhibited different water use strategies.关键词
喀斯特/菜豆树/圆叶乌桕/液流密度/蒸腾耗水Key words
Karst/Radermachera sinica/Triadica rotundifolia/sap flow density/transpiration water consumption引用本文复制引用
张慧玲,丁亚丽,陈洪松,王克林,聂云鹏..喀斯特出露基岩生境两种典型乔木的树干液流特征[J].应用生态学报,2017,28(8):2431-2437,7.基金项目
本文由国家重点研发计划项目(2016YFC0502400,2016YFC0502402)、国家自然科学基金项目(31570428)和中国科学院西部青年学者项目资助 This work was supported by the National Key Research and Development Program of China (2016YFC0502400,2016YFC0502402),the National Natural Science Foundation of China (31570428),and the Young Scholars Program in Western China. （2016YFC0502400,2016YFC0502402）
