Factors influencing altitudinal patterns of C3 plant foliar carbon isotope composition of grasslands on the Qinghai-Tibet Plateau, China

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	Factors influencing altitudinal patterns of C3 plant foliar carbon isotope composition of grasslands on the Qinghai-Tibet Plateau, China
	Zhou, Yongchun(周咏春) ; Fan, JW ; Zhang, WY ; Harris, W ; Zhong, HP ; Hu, ZM ; Song, LL
刊名	ALPINE BOTANY
	2011
卷号	121 期号:2 页码:79-90
关键词	Altitude Atmospheric pressure Foliar delta C-13 Functional groups Grasslands Precipitation Qinghai-Tibet Plateau China Temperature
通讯作者	Fan, JW
英文摘要	Foliar delta C-13 of 219 dominant C-3 species samples from 82 alpine grassland sites on the Qinghai-Tibet Plateau were related to altitude, precipitation and temperature, atmospheric pressure and life-form and taxonomic groupings. Foliar d 13 C values were within those previously found for C3 plants and the mean was higher than those of lower altitude areas. Averaged for all samples foliar delta C-13 increased with altitude at an average rate of 0.78% km(-1). Foliar delta C-13 was higher for herbs than shrubs and was attributed to the absence of shading of herbs by taller woody plants on the Plateau. Significant differences were found between classes and families. Growth season temperature (GST) accounted for variation of foliar delta C-13 more effectively than mean annual temperature (MAT) but growth season precipitation (GSP) did not account for more of the variation than mean annual precipitation (MAP). Drought Index (DI) considered for all samples indicated that water availability did not critically affect carbon isotope discrimination but differences between the variation of foliar delta C-13 for the genera Kobresia and Stipa in relation to DI were shown. When considered separately, decreasing temperature and precipitation with altitude in the region were associated with a reduction of carbon isotope discrimination. However, when temperature and precipitation were accounted for together with atmospheric pressure their effects were not significant. This concurs with the recent finding that in the absence of significant moisture limitation, the reduction of carbon isotope discrimination with increasing altitude reflects an atmospheric pressurerelated adaptation and not an adaptation related to temperature.
收录类别	SCI
资助信息	National Natural Science Foundation of China 31070427;National Key Basic Research Program of China 2010CB950902
语种	英语
公开日期	2012-03-07
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/8490]
专题	地理科学与资源研究所_研究生部
推荐引用方式 GB/T 7714	Zhou, Yongchun,Fan, JW,Zhang, WY,et al. Factors influencing altitudinal patterns of C3 plant foliar carbon isotope composition of grasslands on the Qinghai-Tibet Plateau, China[J]. ALPINE BOTANY,2011,121(2):79-90.
APA	Zhou, Yongchun.,Fan, JW.,Zhang, WY.,Harris, W.,Zhong, HP.,...&Song, LL.(2011).Factors influencing altitudinal patterns of C3 plant foliar carbon isotope composition of grasslands on the Qinghai-Tibet Plateau, China.ALPINE BOTANY,121(2),79-90.
MLA	Zhou, Yongchun,et al."Factors influencing altitudinal patterns of C3 plant foliar carbon isotope composition of grasslands on the Qinghai-Tibet Plateau, China".ALPINE BOTANY 121.2(2011):79-90.