应用生态学报2018，Vol.29Issue(4)：1117-1124,8.DOI:10.13287/j.1001-9332.201804.021
出露基岩生境典型植物树干液流对自然降水和连续干旱的响应特征
Responses of sap flow to natural rainfall and continuous drought of tree species growing on bedrock outcrops
摘要
Abstract
This study focused on bedrock outcrops,a very common habitat in karst region of southwest China.To reveal the responses of plant transpiration to natural rainfall and continuous drought,two tree species typical to this habitat,Rademachera sinica and Triadica rotundifolia,were selected as test materials.A rainout shelter was used to simulate continuous drought.The sap flow dynamics were monitored using the method of Granier's thermal dissipation probe (TDP).Our results showed that sap flow density increased to different degrees after rain in different stages of the growing season.Sap flow density of the deciduous species T.rotundifolia was always higher than that of the semi-deciduous species R.sinica.After two months without rainfall input,both species exhibited no obvious decrease in sap flow density,indicating that rainfall was not the dominant source for their water uptake,at least in the short-term.Based on the regression relationships between sap flow density and meteorological factors before and after rainfall,as well as at different stages of continuous drought,we found that the dynamics of meteorological factors contributed little to plant transpiration.The basic transpiration characteristics of both species were not changed in the circumstance of natural rainfall and short-term continuous drought,which would be closely related to the special water storage environments of bedrock outcrops and the reliance on deep water sources by tree species.关键词
喀斯特/菜豆树/圆叶乌桕/液流密度/蒸腾耗水量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..出露基岩生境典型植物树干液流对自然降水和连续干旱的响应特征[J].应用生态学报,2018,29(4):1117-1124,8.基金项目
本文由国家重点研发计划项目(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(聂云鹏)资助 （2016YFC0502402）
This work was supported by the National Key Research and Development Program of China (2016YFC0502402),the National Natural Science Foundation of China (31570428) and the Young Scholars of Western China (for Yunpeng Nie). （2016YFC0502402）
