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OALib Journal期刊
ISSN: 2333-9721
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贡嘎山木本植物碳同位素沿海拔梯度的变化
DOI: 10.3969/j.issn.1000-2006.2014.06.007, PP. 33-37
Keywords: 碳同位素δ13c,木本植物,海拔梯度,生活型,贡嘎山
Abstract:
对贡嘎山东坡不同海拔的主要木本植物稳定碳同位素的组成进行了测定。结果表明:22种木本植物叶片δ13c值变化范围为-3.236%～-2.521%,平均值(-2.957±0.163)%;不同海拔间植物叶片δ13c值差异显著,随海拔上升叶片δ13c值呈增加趋势;同种植物(大叶金顶杜鹃、峨眉冷杉、水青树、箭竹)的δ13c值随海拔的增加也呈相同的变化趋势。不同生活型植物叶片δ13c值之间差异显著,落叶树种显著高于常绿树种。叶片δ13c值与6―9月平均温度呈显著的负相关关系,与6―8月降水量呈显著的正相关关系,温度、降水是影响木本植物叶片δ13c值海拔差异的主要因子。
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