Annual and seasonal variation of sap flow and conductance of pine trees grown in elevated carbon dioxide and temperature

	Annual and seasonal variation of sap flow and conductance of pine trees grown in elevated carbon dioxide and temperature
	Wang, KY ; Kellomaki, S ; Zha, TS ; Peltola, H
刊名	JOURNAL OF EXPERIMENTAL BOTANY
	2005
卷号	56 期号:409 页码:155_165
关键词	closed-top chamber CO2 and temperature elevation crown conductance Pinus sylvestris sap flow
ISSN号	0022-0957
通讯作者	Wang, KY, Chinese Acad Sci, Chengdu Inst Biol, POB 406, Chengdu 610041, Peoples R China.
中文摘要	Measurements of sap flow, crown structure, and micro-climate were used to estimate the transpiration of individual 30-year-old Pinus sylvestris L. trees grown in elevated temperature and CO2. The trees were enclosed in closed-top chambers and exposed either to current ambient conditions (CON), or elevated CO2 (+350 mumol mol(-1); EC), or elevated temperature (+2 to +6 degreesC; ET) or a combination of EC and ET (ECT) since 1996, and the measurements were made from 1999 to 2001. EC significantly increased annual sap flow per tree (F-t.m) by 14% in 1999, but reduced it by 13% in 2000 and 16% in 2001. The CO2-induced increase in F-t.m in 1999 was due to a large increase in foliage area of trees, which more than compensated for a small decrease in crown conductance (G(c)) The CO2-induced decreases in F-t.m in 2000 and 2001 resulted from a pronounced decline in G, which was much greater than the increase in foliage area. The CO2-induced increase in sensitivity of Gc at high vapour pressure deficit (VPD) did not alter the general response of sap flow to CO2 enrichment, but it did affect the diurnal courses of sap flow on some days during the main growing season (days 150-240). ET increased F-t.m by 53%, 45%, and 57% in 1999, 2000, and 2001, respectively, attributable to the combined effects of greater foliage area and maximum crown conductance, lower stomatal sensitivity to high VPD, and higher transpiration demand relative to the control treatments. There was no significant interaction between CO2 and temperature on sap flow, because ECT entailed approximately similar patterns of sap flow to ET, suggesting that the temperature played a dominate role in the case of ECT under boreal climate conditions.
学科主题	Plant Sciences
收录类别	SCI
语种	英语
公开日期	2011-07-08
内容类型	期刊论文
源URL	[http://210.75.237.14/handle/351003/21760]
专题	成都生物研究所_生态研究
推荐引用方式 GB/T 7714	Wang, KY,Kellomaki, S,Zha, TS,et al. Annual and seasonal variation of sap flow and conductance of pine trees grown in elevated carbon dioxide and temperature[J]. JOURNAL OF EXPERIMENTAL BOTANY,2005,56(409):155_165.
APA	Wang, KY,Kellomaki, S,Zha, TS,&Peltola, H.(2005).Annual and seasonal variation of sap flow and conductance of pine trees grown in elevated carbon dioxide and temperature.JOURNAL OF EXPERIMENTAL BOTANY,56(409),155_165.
MLA	Wang, KY,et al."Annual and seasonal variation of sap flow and conductance of pine trees grown in elevated carbon dioxide and temperature".JOURNAL OF EXPERIMENTAL BOTANY 56.409(2005):155_165.