通过甘南地区金露梅的研究,以营养元素的不同水平供给为外部驱动因素,有无繁殖过程为内部因素,比较分析了金露梅叶片氮磷化学计量学的变化特征.研究结果表明:施肥显著影响了叶片的w(N)和w(P),施肥后叶片的w(N)依次为17.8,18.9,20.1,22.6mg/g,w(P)依次为1.92,2.05,2.19,2.58mg/g,但施肥对w(N):w(P)的影响不显著.繁殖显著降低了叶片的w(N)和w(N):w(P),而对w(P)影响不显著.外部和内部因素对金露梅叶片的化学计量学的影响不相同.不同的施肥水平显著影响金露梅叶片的w(N)和w(P),而对w(N):w(P)影响不显著.证明繁殖过程导致了氮的大量消耗和w(N):w(P)的显著降低.金露梅在内外因素的影响下分别表现了w(N):w(P)的趋同和分异.
Leaf N and P stoichiometry of Potentilla fruticosa L.were studied under external factors (different nutrients level) and internal factors (with and without reproduction).The results showed that there was a significant effect of fertilization on leaf w(N) and w(P);leaf w(N) was 17.8,18.9,20.1,22.6mg/g,leaf w(P) was 1.92,2.05,2.19,2.58mg/g after fertilization (0,40,80,120 g/m2 NH4H2PO4) respectively;but there was no significant effect of fertilization on w(N):w(P) ratios.Reproduction significantly decreased leaf N content while the impact on P content was weak.The effect of external and internal factors on the leaf stoichiometry of Potentilla fruticosa L.was different.Fertilization affected leaf N and P content significantly while it did not affect w(N):w(P) significantly.Reproduction decreased leaf w(N) and leaf w(N):w(P) significantly.Leaf w(N):w(P) of Potentilla fruticosa L.showed a convergence and differentiation under external and internal factors.