鬼箭锦鸡儿叶片和土壤碳稳定同位素特征及其影响因素

doi:10.13287/j.1001-9332.202105.004

摘要/Abstract

摘要： 为探究高海拔地区的植物碳(C)循环过程与其生境的关系,以生长在高山地区的豆科灌木鬼箭锦鸡儿为研究对象,沿着横跨我国东西部山区的样带采集35个样点的鬼箭锦鸡儿叶片和土壤样品,分析了鬼箭锦鸡儿叶片碳稳定同位素组成(δ¹³C)、土壤δ¹³C、叶片和土壤δ¹³C差值(Δδ¹³C)在不同采样点的特征及其与气候因子、叶片和土壤元素的关系。结果表明:鬼箭锦鸡儿叶片δ¹³C的变化范围为-30.9‰～-27.1‰,平均值为-28.4‰,土壤δ¹³C的变化范围为-26.2‰～-23.2‰,平均值为-25.3‰,Δδ¹³C的变化范围为2.0‰～7.7‰,平均值为3.1‰;叶片δ¹³C显著低于土壤δ¹³C,且随着叶片δ¹³C增加,土壤δ¹³C先降低后升高;叶片δ¹³C与生长季均温和叶片C含量呈显著负相关,土壤δ¹³C与相对湿度和最暖月均温呈显著负相关,与土壤碳∶氮(C∶N)呈显著正相关,随土壤C含量的增加土壤δ¹³C先降低后升高,Δδ¹³C与叶片C含量、土壤C含量和土壤C∶N呈显著正相关;气候因子对叶片δ¹³C和Δδ¹³C具有直接影响,同时也通过对叶片和土壤元素的影响,间接导致叶片δ¹³C、土壤δ¹³C和Δδ¹³C的改变。高海拔地区的气候因子、叶片和土壤元素共同影响鬼箭锦鸡儿的C循环过程。

关键词: 鬼箭锦鸡儿, 碳稳定同位素, 气候因子

Abstract: In order to explore the relationship of plant carbon (C) cycling with its habitat in the high-altitude regions, a leguminous shrub, Caragana jubata, that mainly distributed in those areas was studied. We collected leaf and soil samples of C. jubata from 35 sites along an east-west transect across the alpine regions of China. We measured leaf carbon stable isotope (δ¹³C), soil δ¹³C, and the difference between leaf and soil δ¹³C (Δδ¹³C) of each sampling site. We further analyzed the effects of climatic factors, leaf and soil elements on leaf δ¹³C, soil δ¹³C and Δδ¹³C. Results showed that leaf δ¹³C ranged from -30.9‰ to -27.1‰, with a mean value of -28.4‰, soil δ¹³C ranged from -26.2‰ to -23.2‰, with a mean value of -25.3‰, and Δδ¹³C ranged from 2.0‰ to 7.7‰, with a mean value of 3.1‰. δ¹³C values of leaf was significantly lower than that of soil. Soil δ¹³C initially decreased and subsequently increased with increasing leaf δ¹³C. Leaf δ¹³C was negatively correlated with growing season temperature and leaf C content. Soil δ¹³C was negatively correlated with relative humidity and mean temperature of the warmest month, and was positively correlated with soil carbon:nitrogen (C:N). Soil δ¹³C firstly decreased and subsequently increased with soil C content. Δδ¹³C was positively correlated with leaf C content, soil C content, and soil C: N. Climatic factors directly affected leaf δ¹³C and Δδ¹³C, and indirectly affected leaf δ¹³C, soil δ¹³C and Δδ¹³C through their effects on leaf and soil elements. The C cycle of C. jubata was affected by climatic factors, leaf and soil elements in the alpine regions.

Key words: Caragana jubata, carbon stable isotope, climatic factor

艾喆, 徐婷婷, 李媛媛, 马飞. 鬼箭锦鸡儿叶片和土壤碳稳定同位素特征及其影响因素[J]. 应用生态学报, 2021, 32(5): 1744-1752.

AI Zhe, XU Ting-ting, LI Yuan-yuan, MA Fei. Characteristics and influence factors in leaf and soil carbon stable isotopes of Caragana jubata.[J]. Chinese Journal of Applied Ecology, 2021, 32(5): 1744-1752.

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