Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Chinese Journal of Ecology》 2014-04
Add to Favorite Get Latest Update

The shortest time of plant stem water extraction based on hydrogen and oxygen isotope analysis

DING Ya-li;CHEN Hong-song;YANG Jing;NIE Yun-peng;WANG Ke-lin;Key Laboratory of Agro-ecological Processes in Subtropical Region,Institute of Subtropical Agriculture,Chinese Academy of Sciences;Huanjiang Observation and Research Station for Karst Ecosystems,Chinese Academy of Sciences;University of Chinese Academy of Sciences;  
Plant-water relation is an important part of eco-hydrological process.Its study scope has been greatly expanded with the improved research precision based on the application of stable isotope technique.However,water extraction of plant samples is time-consuming and laborious,which limits the application of this technology.In this study,we used the vacuum distillation method to extract plant stem water from the same quality of samples of different plant species under the same time gradient.The shortest water extraction time was obtained based on the changing characteristics of water extraction rates and stable isotope values of the extracted water.We further tried to establish the correlation between the shortest extraction time and the wood density.The results showed that the wood densities of three target plants,Rhus chinensis,Alchornea trewioides and Pyracantha fortuneana,were 0.35,0.55 and 0.67 g ·cm-3,respectively.In addition,the water extraction rates for these three kinds of plant samples with an equal mass(about 3 g) were roughly close to 100% within 45 min.While based on the isotope analysis of the extracted water,the shortest extraction time for R.chinensis,A.trewioides and P.fortuneana was no less than 45,60 and 60 min,respectively.The shortest extraction time had a trend to increase with the increase in wood density.These results indicated the probability to establish the relationship between the wood density and the plant stem water shortest extraction time,which would effectively improve the extraction efficiency.
【Fund】: 中国科学院西部行动计划项目(KZCX2-XB3-10);; 国家自然科学基金项目(41171187 51379205 31100294);; 中国科学院知识创新青年人才领域前沿项目;; 中国科学院“西部之光”人才培养计划博士项目资助
【CateGory Index】: S781.31
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved