摘要:海拔对陆地生物地球化学循环过程具有重要影响。研究植物叶片碳（C）、氮（N）、磷（P）生态化学计量沿海拔的变化特征，有助于深入了解植物对环境的适应策略。通过对青藏高原东北缘不同海拔（2980-3280，3281-3580，4180-4480，4481-4780 m）二裂委陵菜（Potentilla bifurca）叶片C、N、P含量及其计量比的首次研究，对其生态适应性和限制元素进行了初步探讨，结果发现：（1）二裂委陵菜叶片C、N、P平均含量分别为411.58 g/kg、22.47 g/kg和1.35 g/kg；C：N、C：P、N：P的均值分别为18.51、321.81和17.33。（2）随着海拔升高，二裂委陵菜叶片C含量和N：P呈上升趋势，分别从400.40 g/kg增加到418.08 g/kg、12.73增加到18.81；N、P含量呈先降后增趋势，其最大和最小值分别为23.88 g/kg和20.48 g/kg、1.89 g/kg和1.12 g/kg；C：N、C：P呈先增后降趋势，分别从20.42减少到17.79、372.18减少到334.72。（3）二裂委陵菜叶片C与N、C：N不相关，与P显著负相关，而与C：P、N：P显著正相关；N与N：P不相关，与P显著正相关，而与C：N、C：P显著负相关；P与C：N、C：P、N：P显著负相关；C：N与C：P显著正相关，与N：P不相关；C：P与N：P显著正相关。（4）二裂委陵菜生长主要受P限制。



Abstract:Elevation has a major impact on the terrestrial biogeochemical processes cycle. Exploring the variations in leaf ecological stoichiometry along the elevation gradient will enable an understanding of the adaptative strategy of the plant. The leaf C, N, and P concentrations of the leaf and its corresponding ecological stoichiometry of Potentilla bifurca at different elevations, including from 2980 to 3280 m, 3281 to 3580 m, 4180 to 4480 m, and 4481 to 4780 m, on the northeastern Qinghai-Tibetan Plateau, were investigated. Its ecological adaptability and restricted elements were also discussed for the first time. The results showed that the concentrations of leaf C, N, and P were 411.58 g/kg, 22.47 g/kg, and 1.35 g/kg, respectively, and leaf C:N, C:P, and N:P values were 18.51, 321.81, and 17.33, respectively. The concentrations of leaf C and the N:P of Potentilla bifurca increased with an increase in elevation, with the value of leaf C increasing from 400.40 g/kg to 418.08 g/kg, and the value of leaf N:P increasing from 12.73 to 18.81. The contents of leaf N and P first decreased and then increased with the elevation increase, with maximum and minimum values of 23.88 g/kg and 20.48 g/kg, and 1.89 g/kg and 1.12 g/kg, respectively. However, leaf C:N and C:P first increased and then decreased with the elevation increase; C:N decreased from 20.42 to 17.79, while C:P decreased from 372.18 to 334.72. The concentration of leaf C was neither related to leaf N nor leaf C:N, while it was significantly and negatively related to leaf P and significantly and positively related to leaf C:P and N:P. The concentration of leaf N was not related to leaf N:P, but was significantly and positively related to leaf P and significantly and negatively related to leaf C:N and C:P. The concentration of leaf P was significantly and negatively related to leaf C:N, C:P, and N:P, leaf C:N was significantly and positively related to leaf C:P, and leaf C:N was unrelated to leaf N:P. Leaf C:P was significantly and positively related to leaf N:P. The growth of Potentilla bifurca on the Qinghai-Tibetan Plateau was primarily limited by phosphorus.





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