甘南亚高寒草甸金露梅叶片氮磷化学计量学动态  

Leaf nitrogen and phosphorus stoichiometry in Potentilla fruticosa L.affected by internal and external factors in the subalpine in Gannan

作　　者：赵君[1] 张仁懿[1] 李新娥[1] 陈凌云[1] 王刚[1] 

机构地区：[1]兰州大学干旱与农业草地教育部重点实验室,兰州730000

出　　处：《兰州大学学报（自然科学版）》2011年第2期88-92,共5页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金项目(30970465)

摘　　要：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.

关 键 词：叶片氮磷动态 金露梅 稳态调节 甘南 

分 类 号：Q948[生物学—植物学]