Ai Zhe, Xu Ting-Ting, Li Yuan-Yuan, Ma Fei
College of Resources and Environmental Science, Ningxia University, Yinchuan 750021, China.
School of Life Science, Ningxia University, Yinchuan 750021, China.
Ying Yong Sheng Tai Xue Bao. 2021 May;32(5):1744-1752. doi: 10.13287/j.1001-9332.202105.004.
In order to explore the relationship of plant carbon (C) cycling with its habitat in the high-altitude regions, a leguminous shrub, , that mainly distributed in those areas was studied. We collected leaf and soil samples of from 35 sites along an east-west transect across the alpine regions of China. We measured leaf carbon stable isotope (δC), soil δC, and the difference between leaf and soil δC (ΔδC) of each sampling site. We further analyzed the effects of climatic factors, leaf and soil elements on leaf δC, soil δC and ΔδC. Results showed that leaf δC ranged from -30.9‰ to -27.1‰, with a mean value of -28.4‰, soil δC ranged from -26.2‰ to -23.2‰, with a mean value of -25.3‰, and ΔδC ranged from 2.0‰ to 7.7‰, with a mean value of 3.1‰. δC values of leaf was significantly lower than that of soil. Soil δC initially decreased and subsequently increased with increasing leaf δC. Leaf δC was negatively correlated with growing season temperature and leaf C content. Soil δC was negatively correlated with relative humidity and mean temperature of the warmest month, and was positively correlated with soil carbon:nitrogen (C:N). Soil δC firstly decreased and subsequently increased with soil C content. ΔδC was positively correlated with leaf C content, soil C content, and soil C: N. Climatic factors directly affected leaf δC and ΔδC, and indirectly affected leaf δC, soil δC and ΔδC through their effects on leaf and soil elements. The C cycle of . was affected by climatic factors, leaf and soil elements in the alpine regions.
为了探究高海拔地区植物碳（C）循环与其栖息地的关系，对一种主要分布于这些地区的豆科灌木进行了研究。我们沿着一条东西向横跨中国高寒地区的样带，从35个地点采集了该灌木的叶片和土壤样本。我们测量了每个采样点的叶片碳稳定同位素（δC）、土壤δC以及叶片与土壤δC的差值（ΔδC）。我们进一步分析了气候因素、叶片和土壤元素对叶片δC、土壤δC和ΔδC的影响。结果表明，叶片δC范围为-30.9‰至-27.1‰，平均值为-28.4‰；土壤δC范围为-26.2‰至-23.2‰，平均值为-25.3‰；ΔδC范围为2.0‰至7.7‰，平均值为3.1‰。叶片的δC值显著低于土壤的δC值。土壤δC随叶片δC的增加先降低后升高。叶片δC与生长季温度和叶片C含量呈负相关。土壤δC与相对湿度和最暖月平均温度呈负相关，与土壤碳氮比（C:N）呈正相关。土壤δC随土壤C含量先降低后升高。ΔδC与叶片C含量、土壤C含量和土壤C:N呈正相关。气候因素直接影响叶片δC和ΔδC，并通过对叶片和土壤元素的影响间接影响叶片δC、土壤δC和ΔδC。该灌木的C循环受高寒地区气候因素、叶片和土壤元素的影响。
