不同恢复措施对典型草原优势植物碳、氮、磷化学计量特征的影响

生态化学计量学是当前全球变化生态学和生物地球化学循环新的研究热点和焦点．为了研究宁夏典型草原不同恢复措施对优势植物地上部分C、N、P化学计量特征的影响，以不同恢复措施宁夏典型草原为研究对象，对长芒草、阿尔泰狗哇花、冷蒿等优势植物的C、N、P化学计量特征进行研究，结果表明：不同恢复措施对优势植物长芒草地上部分有机C含量影响并不显著（P〉O．05），对全N、全P含量有显著影响（P〈O．05），表明恢复措施的不同导致优势植物地上部分N、P分配发生变化；不同恢复措施下，菊科植物对N的敏感度小于禾本科植物对N的敏感度，P素对于菊科植物的影响大于采本科植物；P对植物的限制性显高于N．

Study on the carbon,nitrogen and phosphorus stoichiometry of dominant plants under different recovery measures in typical steppe

Ecological stoichiometry is the hotspot and focus of research on global change of ecology and bio- geochemical cycle. We choose different recovery measures on typical steppe in Ningxia to be the object of study, and research the variation in leaf C,N and P stoichiometry of dominant plants, such as Stipa bun- geana Trin, Heteropappu, s and Artemisia frigida. In order to study the effects of different restoration measures in Typical Steppe in Ningxia to variation in leaf C, N and P stoichiometry in the part that aboveground of plants. The results showed that the effects of different recovery measures to C of dominant plants is not significant（P〉0.05） ~ and there is significant effect to N and P（P〈0.05）. That means the different recovery measures lead to different distribution of N and P of dominant plants in the part that aboveground of plant. The Compositae shows more sensitive to the different recovery measures than Gra- mineae, and the effect of P in Compositae is more than Gramineae, and the astrict of P to plant is more than N.