水土保持研究2012，Vol.19Issue(3)：42-47,6.
六盘山主要树种叶片稳定性碳同位素组成的时空变化特征
Spatial-temporal Pattern of Stable Carbon Isotope Composition of Dominant Tree Species in Liupanshan Mountain
摘要
Abstract
The leaf δ^13C values of dominant （Xiangshuihe Watershed, semi-humid area） tree species were measured from and north （Diediegou Watershed, June to September in 2010 in the south semi-arid area） of Liupanshan Mountain, Ningxia. The differences in leaf 313C between species and individuals were analyzed, and its seasonal pattern was also de termined. The results showed that leaf δ^13C increased with increase of canopy height of Larix principris-rupprechtii, Betula platyphylla, Pinus tablaeformis, but the leaf δ^13C in the low canopy of Pinus arrnandii and Quercus liaotungen- sis were higher compared with those of the mid- and upper parts in the canopy. The leaf δ^13C values of species were vari- ous in different periods of growing season, being relatively higher δ^13C in the early stage than that in the middle and late phases. And the characteristics of seasonal pattern in leaf δ^13C were correlated with water environmental condition of habitat. In the semi-humid area, the leaf δ^13C of tree species decreased over the time, but in the semi-arid area, the seasonal change in the leaf δ^13Cfollowed as a ＇high-low-high＇ pattern during the growing season. The leaf δ^13C among indi- vidual trees of L. principris-rupprechtii and Hippophae rhamnoides in two different water environmental regions were significantly different, but it was mainly influenced by the seasonal pattern of rainfall in different stages of growing season, semi-arid area with the highest values in dry season （the early and late stage of the growing season） had similar δ^13C values in rainy season （the medium stage of the growing season） in semi-humid area. It showed that the ability of water use of the same tree species could be improved through long-term adaptation to drought.关键词
δ^13C/冠层/季节变化/水分生境Key words
δ^13C/canopy/seasonal change/habitat分类
农业科技引用本文复制引用
王云霓,熊伟,王彦辉,程积民,于澎涛,徐丽宏,何聪,郝佳,李振华,张晓蓓..六盘山主要树种叶片稳定性碳同位素组成的时空变化特征[J].水土保持研究,2012,19(3):42-47,6.基金项目
国家“十二五”科技计划课题 （）
中国林业科学研究院森林生态环境与保护研究所基本科研业务费专项资金项目 （）
国家自然科学基金 （）
林业公益性行业科研专项经费 （）
