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题名: Gas exchange and resource utilization in two alpine oaks at different altitudes in the Hengduan Mountains
作者: null(张石宝); Zhou, Zhe-Kun; Hu, Hong; Xu, Kun
刊名: CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE
英文摘要: 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.
出版日期: 2007-07-01
卷号: 37, 期号:7, 页码:1184-1193
语种: 英语
收录类别: SCI
学科分类: Forestry
ISSN号: 0045-5067
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/2535
Appears in Collections:资源植物与生物技术所级重点实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Kunming Inst Bot, Kunming 650204, Peoples R China

Recommended Citation:
Zhang, SB; Zhou, ZK; Hu, H; Xu, K.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,2007,37(7):1184-1193
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