青藏高原不同生境中祁连圆柏叶片δ13C变化及其与环境和树高的关系

doi:10.7522/j.isnn.1000-0240.2015.0153

摘要/Abstract

摘要： 以分布于青藏高原东北缘的优势乔木祁连圆柏为研究对象,分析了叶片δ¹³C值变化及其与树高、土壤含水量、降雨量和叶片碳氮含量的关系.研究结果表明:研究区祁连圆柏叶片δ¹³C值的变化范围为-28.58‰~-23.95‰,平均值为-25.66‰,变化幅度为4.63‰,而同一生境不同个体之间的变化幅度为2.69‰和2.93‰,说明祁连圆柏叶片δ¹³C值的变化是植物自身遗传特性与环境因子共同作用的结果.叶片δ¹³C值与树高呈明显的负相关关系(p<0.01),并且这种关系不随采样位点的不同而改变;与叶片C和N含量不相关,而与土壤含水量和年平均降水量显著负相关(p<0.001).

关键词: 祁连圆柏, 叶片δ¹³C值, 树高, 降水量

Abstract: The foliar stable carbon isotopic composition(δ¹³C) of Sabina przewalskii Kom., a dominant tree population on the northeast Tibetan Plateau, and its correlation with foliar carbon and nitrogen contents, tree height, precipitation and soil moisture are examined. The results show that δ¹³C values range from-28.58‰ to-23.95‰, with an average of-25.66‰. The individual variation range of δ¹³C value, respectively, is 2.69‰ and 2.93‰ in two homogenous habitats, which indicates that the variation of foliar δ¹³C is determined by both botanical genetic character and environmental factors. The correlation of δ¹³C with tree height is strongly negative(p<0.01), and the negative correlation do not vary with sample sites. Foliar δ¹³C do not correlate with foliar nitrogen and carbon contents. The correlations of δ13C with soil moisture and precipitation are remarkably negative(p<0.001).

Key words: Sabina przewalskii Kom., foliar δ¹³C value, tree height, precipitation

中图分类号:

Q948.11

张有福, 陈拓, 张鹏, 徐国保. 青藏高原不同生境中祁连圆柏叶片δ¹³C变化及其与环境和树高的关系[J]. 冰川冻土, 2015, 37(5): 1388-1395.

ZHANG Youfu, CHEN Tuo, ZHANG Peng, XU Guobao. Foliar δ¹³C values of Sabina przewalskii in different habitats on the Tibetan Plateau: variation and relation with environmental factors and tree height[J]. JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY, 2015, 37(5): 1388-1395.

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青藏高原不同生境中祁连圆柏叶片δ¹³C变化及其与环境和树高的关系

Foliar δ¹³C values of Sabina przewalskii in different habitats on the Tibetan Plateau: variation and relation with environmental factors and tree height

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