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The concentration and efflux of tree stem CO_(2) and the role of xylem sap flow

Frontiers in Biology 2009年第1期4卷 47-54页

作者： Ping ZHAO Dirk HÖLSCHER South China Institute of Botany Chinese Academy of SciencesGuangzhou 510650China 2 Department of Tropical Silviculture and Forest EcologyUniversity of Göttingen37077 GöttingenGermany

The accurate assessment of actual tree stem respiration and its relation with temperature plays a considerable role in investigating the forest carbon *** increasing number of research reports have indicated that tree stem respiration determined with the commonlyapplied chamber gas exchange measuring system does not follow expectations regarding temperature *** method is based on the nowadays widely-accepted theory that the respired CO_(2) in a tree stem would all diffuse outward into the ***,it neglects partial CO_(2) that is dissolved in the xylem sap and is carried away by the transpirational *** have started to realize that the respired CO_(2) measured with the chamber gas exchange method is only a portion of the total stem respiration(CO_(2) efflux),while the other portion,which is sometimes very substantial in quantity(thought to occupy maybe 15%-75%of the total stem respiration),is transported to the upper part of the stem and to the canopy by sap *** suggests that the CO_(2) produced by respiration is re-allocated within the ***,the change in CO_(2) efflux could be reflected in the rates of sap flow in addition to its dependence on *** methods and instruments are required to quantify the internal and external CO_(2) fluxes in the trunk and their interaction with related environmental factors.

关键词： sap flow rates respired CO_(2)in the stem retranslocation of stem respiration

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