Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS

Coupling Relationship between Tree Growth and Water Consumption of Pinus elliottii in Subtropical Red Earth Area

  • 1. Nanchang Institute of Technology, Nanchang 330029,China;
    2. Institute of Geographic Sciences and Natural Resources Research,CAS, Beijing 100101,China;
    3. Forestry College,Beijing Forestry University,Beijing 100083,China

Received date: 2006-10-16

  Revised date: 2007-12-29

  Online published: 2008-07-28


Whole-tree sap flow density (SFD) in an artificial Pinus elliottii forest was measured on six trees continuously using Granier’s thermal dissipation probe (TDP) method.Several ambient environmental factors including meteorological variables and soil variables were also measured simultaneously. At the same time,stem analysis and branch analysis were utilized to investigate tree growth.The aim of this paper was to explore the characteristics of water consumption and carbon accumulation of P.elliottii and provide scientific methods and fundamental data for the research on coupling water and carbon in subtropical area of China.The results were as follows:SFD was mainly related to some meteorological factors in stands such as canopy temperature (CT),canopy relative humidity (CRH) and photosynthetically active radiation (PAR).Correlations between SFD and the three separate factors were well expressed by linear regression models.Multiplelinear model between SFD and the integrated three factors was also established.All equations and correlation parameters were significant at 1% safety.The sequence of correlated degrees was as: CRH>PAR>CT.A significant linear correlation was found between daily cumulative sap flow and SWA with r2 value reaching 0.99. For P. elliottii in early growth stage,the correlation between sapwood area (SWA) and diameter at breast height (DBH) was well fitted by quadratic model.Based on sap flow observation and biomass investigation results during 2004,an important conclusion that 1.7731 gram biomass would be formed with the consumption of about 1kg water was obtained.Furthermore,water consumption was also calculated from biomass data according to the results above in the end of the paper.

Cite this article

TU Jie, LIU Qi-jing, LIN Yao-ming, LI Hai-tao . Coupling Relationship between Tree Growth and Water Consumption of Pinus elliottii in Subtropical Red Earth Area[J]. JOURNAL OF NATURAL RESOURCES, 2008 , 23(4) : 685 -693 . DOI: 10.11849/zrzyxb.2008.04.016


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