不同生境黄顶菊碳氮磷化学计量特征

为分析黄顶菊生长限制性元素，研究了三种生境（Ⅰ为水边，Ⅱ为农田，Ⅲ为荒地）黄顶菊植株养分计量特征及其与入侵地土壤养分相关性。结果表明：三种生境黄顶菊入侵地土壤C、N、C:P和N:P均为Ⅲ>Ⅰ>Ⅱ，P为Ⅰ>Ⅱ>Ⅲ，C:N为Ⅲ>Ⅱ>Ⅰ（P<0.05）；三种生境黄顶菊叶片C含量无显著性差异，N和P含量为Ⅰ显著高于Ⅱ和Ⅲ，C:N、C:P和 N:P相反（P<0.05）；叶片和土壤在P、C:N上均呈显著正相关关系，而C、C:P、N:P均相关性不显著；土壤C-N间呈显著正相关，而C-P、N-P间均相关性不显著；叶片N-P间呈显著正相关，而C-N、C-P间均相关性不显著。黄顶菊入侵对土壤有机质和N素的改变是协同进行的。水边黄顶菊生长受N限制，农田和荒地黄顶菊生长受P限制。

Carbon, Nitrogen and phosphorus stoichiometric characteristics of Flaveria bidentis in different habitats

To analysis growth restrictive elements of Flaveria bidentis, three habitats(Ⅰwaterside, Ⅱcropland, Ⅲwasteland)were selected to study the stoichiometric characteristics and relationship of plant leaf and invaded soil. In three habitats, Invaded soil C, N, C:P, N:P were Ⅲ>Ⅰ>Ⅱ, PⅠ>Ⅱ>Ⅲ, C:N Ⅲ>Ⅱ>Ⅰ(P<0.05); The leaf C concentration had no significant difference, Ⅰsignificantly higher than Ⅱ and Ⅲ in N or P, but Ⅱ and Ⅲ were significantly higher than Ⅰin C:N, C:P, N:P (P<0.05). The soil P or C:N was significantly positive correlation with the leaf, no significant correlation with the C, C:P, N:P. The soil C was significantly positive correlation with N, no significant correlation with the C-P, N-P. The leaf N was significantly positive correlation with P, while C-N and C-P were no significant correlation. The change was synchronous between soil organic matter and N. N was growth restrictive element of F. bidentis growing in the waterside, while in the cropland or wasteland was P.