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- Title
Effects of sap velocity on the daytime increase of stem CO efflux from stems of Schima superba trees.
- Authors
Zhu, L.; Zhao, P.; Cai, X.; Zeng, X.; Ni, G.; Zhang, J.; Zou, L.; Mei, T.; Yu, M.
- Abstract
Stem CO efflux ( E) has been estimated from a temperature-related equation, but sap flux often affects measurements of E, which leads to misunderstanding real stem respiration. In order to observe the relationship between E and stem temperature and to analyze the effect of sap velocity on E, stem temperature, E and sap flux were measured from a subtropical Schima superba plantation in South China on three trees for consecutive 3 days in July and October 2009. Stem temperature, E and sap velocity were significantly higher in July than in October. Stem temperature could explain 17-41 and 54-75% variations of E in July and October, respectively. A negative relationship between E and stem temperature was found during 1800-2300 hours in July. The daytime E was 9.2, 4.3 and 2.4% higher than the predicted for three trees in July, and this occurred only on Tree 1 in October. Sap velocity was positively correlated with E for three trees in July, and the increase of E with the increase of sap velocity was only observed on Tree 1 in October. These results demonstrated that the occurrence of sap flux could account for the increase of daytime E, and the effect of sap velocity on E varied with the seasons from the S. superba stem.
- Subjects
CHINA; SAP (Plant); PLANT stem temperature; CARBON dioxide; TROPICAL plants; RESPIRATION in plants
- Publication
Trees: Structure & Function, 2012, Vol 26, Issue 2, p535
- ISSN
0931-1890
- Publication type
Article
- DOI
10.1007/s00468-011-0615-1