Gas exchange and resource utilization in two alpine oaks at different altitudes in the Hengduan Mountains

doi:10.1139/X06-303

	Gas exchange and resource utilization in two alpine oaks at different altitudes in the Hengduan Mountains
	Zhang, Shi-Bao; Zhou, Zhe-Kun; Hu, Hong; Xu, Kun
通讯作者	sbzhang@mail.kib.ac.cn
	2007-07-01
发表期刊	CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE
ISSN	0045-5067
卷号	37 期号:7 页码:1184-1193
摘要	The evergreen, sclerophyllous broadleaf forests composed of alpine oaks in the Hengduan Mountains of southwest China are mainly distributed at altitudes of 1700-4800 in. Gas exchange and related leaf traits of Quercus guyavifolia H. Lev. and Quercus pannosa Hand.-Mazz. were measured at eight sites along an altitudinal gradient to understand their physiological adaptabilities. Both Q. guyavifolia and Q. pannosa showed a significant midday depression in the photosynthesis rate P-N) due to a high vapor pressure deficit and high temperature around noon. The optimum temperature for photosynthesis for the two oak species ranged from 17 to 23 degrees C depending on altitude. When the temperature exceeded 25 degrees C, PN decreased sharply. However, PN was not depressed by high irradiance. As altitude increased, the leaf dry mass per unit area of the two oaks increased but the chlorophyll content decreased, while the maximum values of daily mean photosynthesis rate (P-d), maximum photosynthesis rate (P-max), P-d/P-max water-use efficiency, and photosynthetic nitrogen\ use efficiency occurred at altitudes of 3240-3610 m. Although the photosynthetic capacities of the two oaks were higher in August than in May, altitudinal trends did not change with season. The altitudinal range from 3240 to 3610 in would be optimal for the growth and development of these two alpine oaks in the Hengduan Mountains.
学科领域	Forestry
DOI	10.1139/X06-303
收录类别	SCI
语种	英语
WOS记录号	WOS:000249928100004
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/2535
专题	资源植物与生物技术所级重点实验室
作者单位	Chinese Acad Sci, Kunming Inst Bot, Kunming 650204, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Shi-Bao,Zhou, Zhe-Kun,Hu, Hong,et al. Gas exchange and resource utilization in two alpine oaks at different altitudes in the Hengduan Mountains[J]. CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE,2007,37(7):1184-1193.
APA	Zhang, Shi-Bao,Zhou, Zhe-Kun,Hu, Hong,&Xu, Kun.(2007).Gas exchange and resource utilization in two alpine oaks at different altitudes in the Hengduan Mountains.CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE,37(7),1184-1193.
MLA	Zhang, Shi-Bao,et al."Gas exchange and resource utilization in two alpine oaks at different altitudes in the Hengduan Mountains".CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE 37.7(2007):1184-1193.

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