黑河下游不同生境胡杨(Populus euphratica)叶片碳同位素组成特征

doi:10.7522/j.issn.1000-694X.2014.00135

摘要/Abstract

摘要： 植物中稳定碳同位素组成不但与植物的水分利用效率密切相关,而且反映环境因子对植物的影响。选择黑河下游额济纳旗为研究区,以优势物种胡杨(Populus euphratica)为研究对象,利用稳定碳同位素组成分析研究区胡杨受干旱胁迫程度。结果表明:胡杨叶稳定碳同位素组成(δ¹³C)处于-25.51‰~-30.21‰,平均值为-28.28‰。随干旱胁迫程度增加,δ¹³C值有明显偏正趋势,植物(叶片)碳同位素组成对胡杨成熟木长期适应不同水分胁迫程度有明显的体现。分析δ¹³C与胡杨生长状态发现,δ¹³C与种群密度相关性不明显,与枯枝比呈显著正相关关系,枯枝比可成为碳同位素组成的替代指标,指示胡杨受干旱胁迫的程度。

关键词: 黑河, 胡杨(Populus euphratica), 稳定碳同位素组成, 生长态势, 枯枝比

Abstract: Foliar stable carbon isotope composition can response the effect of water stress on plant growth and is thus an important demonstrator to the niche where plant grows, especially in arid environments. Therefore, it has become key parameter to be used among researches of relationship between plant growth state and the environmental stress. This study selects Populus euphratica growing in the lower reach of the Heihe River as an object. The niche is poor for P. euphratica. It suffers from drought stress in the form of water and salt stress in the studied area. We analyze the state of drought stress by foliar stable carbon isotope composition(δ¹³C). The results shows that δ¹³C ranges from-25.51‰ to-30.21‰ with a mean value of-28.28‰. Comparing δ¹³C with that in other niche where no water stress happens, we found that δ¹³C value in our study is higher. δ¹³C increases with the increase of drought stress. It has significant relative to the ratio of died branches to total branches, but no significant relative to the population density. From the results, we can draw conclusion that δ¹³C can dictate the state of water stress for P. euphratica. The ratio of died branches to total branches can be an important δ¹³C proxy to indicate the niche of P. euphratica.

Key words: Heihe River, Populus euphratica, stable carbon isotope composition, growth state, ratio of died branches to total branches

中图分类号:

Q948.11

袁亚鹏, 赵阳, 赵传燕, 李文娟. 黑河下游不同生境胡杨(Populus euphratica)叶片碳同位素组成特征[J]. 中国沙漠, 2015, 35(6): 1505-1511.

Yuan Yapeng, Zhao Yang, Zhao Chuanyan, Li Wenjuan. Characteristics of Foliar Stable Carbon Isotope Composition of Populus euphratica for Different Niche in the Lower Reach of the Heihe River[J]. JOURNAL OF DESERT RESEARCH, 2015, 35(6): 1505-1511.

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