Electrochemical in-situ studies of solar mediated oxygen transport and turnover dynamics in a tree trunk of Tilia cordata

iForest: Biogeosciences and Forestry

Tötzke, C.¹ 

关键词: Ecophysiology;    Tree Stems;    Oxygen Transport;    Xylem;    Sap Flow;    Tree Metabolism;    Electrical Potential;   

DOI  :  10.3832/ifor1681-010

学科分类：社会科学、人文和艺术（综合）

来源: Societa Italiana di Selvicoltura ed Ecologia Forestale (S I S E F)

【 摘 要 】

Abstract: Platinum electrodes were implanted into the xylem of a lime tree (Tilia cordata) stem and solar-induced electrochemical potential differences of up to 120 mV were measured during the vegetative period and up to 30 mV in winter. The time dependent curves were found to be delayed with respect to solar radiation, sap flow activity, temperature and vapor pressure deficit. A general equation for the potential difference was derived and simplified by analyzing the effect of temperature and tensile strength. The potential determining influence of oxygen concentration on the respective location of the platinum electrode was identified as the principal phenomenon measured. A systematic analysis and investigation of the observed periodic oxygen concentration signals promises new information on sap flow, oxygen diffusion through tree tissues and on oxygen consumption related to the energy turnover in tree tissues.

【 授权许可】

Unknown