阜新市主要园林树种叶片生态化学计量特征

以阜新市主要园林树种为研究对象，分析各树种叶片C、N、P化学计量特征。结果表明：园林树种叶片C、N和P含量分别为496~664 mg?g^-1、7.5~26.6 mg?g^-1和1.0~2.2 mg?g^-1，C/N、C/P和N/P分别为22.4~74.3、262~522和5.4~13.8，且叶片N含量与C/N和N/P之间显著相关（P＜0.001）。常绿针叶树种叶片N、P含量和N/P显著低于阔叶落叶树种（P＜0.05），而C/N和C/P显著高于阔叶落叶树种（P＜0.05）；乔木树种叶片N含量和N/P显著高于灌木树种（P＜0.05），而叶片P含量及C/N和C/P二者之间差异不显著（P＞0.05），表明园林树种具有较高的储C能力及养分利用效率。根据叶片N/P发现，阜新市园林树种生长主要受N限制。

Leaf Stoichiometric Properties of Garden Tree Species in Fuxin City

The values of stoichiometric properties of leaf C, N and P contents of 55 garden tree species in Fuxin city Liaoning Province, China were derived. The results showed that the C, N and P contents varied in ranges of 496-664, 7.5-26.6 mg?g^-1 and 1.0-2.2 mg?g^-1, and the C/N, C/P and N/P in ranges of 22.4-74.3, 262-522 and 5.4-13.8, respectively. Moreover, there was a significant correlation between leaf N and C/N or C/P （P<0.001). The leaf N and P contents and N/P of evergreen coniferous tree species were significantly higher than those of broadleaf deciduous tree species （P<0.05), but C/N and C/P of evergreen coniferous tree species were significantly lower than those of broadleaf deciduous tree species （P<0.05). The leaf N content and N/P of tree species were significantly higher than those of shrub species （P<0.05), but the differences in P content, C/P and C/P were not significant （P>0.05). These results revealed that the C storage capability and nutrient use efficiency of garden tree species were high.The garden tree species were N limited in the study area.