【摘要】 分析不同海拔植物叶片化学计量特征有助于了解植物对环境变化的适应策略。以白龙江流域海拔1 050～3 070 m的草本植物叶片为研究对象，测定了草本植物叶片中C、N和P的含量。通过线性回归揭示不同海拔对植物叶片化学计量特征的影响。结果表明：（1）白龙江流域草本植物叶片C、N、P元素含量均值分别为358.06、19.41和1.86 mg/g，计量比C∶N、C∶P和N∶P分别为21.16、219.08和11.02，随着海拔的增加，N∶P也呈现极显著上升趋势（p <0.01）;C∶N随海拔的增加呈现极显著下降趋势（p <0.01），而C∶P、N∶P没有显著关系；（2）叶片N∶P<14，说明草本植物生长受到N元素限制；（3） C含量与C∶N、C∶P呈极显著正相关（p<0.01），与N∶P没有相关关系。说明海拔影响着植物化学计量特征，白龙江流域草本植物受N元素限制。更多还原

【Abstract】 Analyzing the leaf stoichiometric characteristics of plants at different elevations helps understand their adaptive strategies to environmental changes. In this study, the contents of C, N and P in the leaves of herbaceous plants at an altitude of 1050～3070 m in Bailong River were determined. The effects of altitude on the stoichiometric characteristics of plant leaves and the limiting elements of plants were revealed by linear regression and correlation. The result shows that(1)The average contents of C, N and P in herb leaves in the Bailongjiang River Basin were 358.06, 19.41and 1.86 mg/g, respectively. The mean values of C:N, C:P and N:P were 21.16, 219.08 and 11.02, respectively.With the increase in altitude, N and P also showed a significant upward relationship(p<0.01). C: N decreased significantly with the increase in altitude(p<0.01), while C:P and N:P showed no significant relationship.(2) Leaf blade N:P<14 indicated that the growth of herbaceous plants was limited by N.(3) C content was significantly positively correlated with C : N and C : P(p<0.01), but not with N and P. Altitude affects the stoichiometric characteristics of plants, and herbaceous plants in Bailong River Basin are limited by N.更多还原