氮肥对不同退化程度草场羊草光合速率的影响  

Effect of Nitrogen Fertilizer on Photosynthetic Rate of Leymus chinensis in Grassland of Different Degrading Degrees

作　　者：王明铭[1] 鲍雅静[1] 李政海[1] 杨绍欢[1] 焦静平[1] 郭燕宇[1] 

机构地区：[1]大连民族学院环境与资源学院,辽宁大连116600

出　　处：《安徽农业科学》2012年第28期13818-13820,共3页Journal of Anhui Agricultural Sciences

基　　金：国家自然科学基金(30771528;30970494);国家环保公益性行业科研专项(201109025-03B);中央高校基本科研业务费专项资金资助(DC110105;DC120101142)

摘　　要：[目的]研究氮肥对不同退化程度草场羊草光合速率的影响。[方法]以内蒙古白音锡勒牧场羊草为研究对象,通过对草地进行不同的氮肥处理(0、30、50、80 g/m2),分析在不同氮肥梯度下羊草光合速率所受的影响,以及氮肥对不同退化程度草场的影响。[结果]随氮肥梯度的增加,羊草光合速率随之增加;不同退化程度的草原群落中,羊草种群光合速率对氮肥的响应程度不同,退化严重的草场中羊草种群对氮肥的响应程度较好。[结论]氮肥对于退化严重的草场恢复可起到较好的促进作用。[ Objective] This study aimed to investigate the effect of nitrogen fertilizer on photosynthetic rate of Leymus chinensis in the grasslands of different degrading degrees. [ Method] With the L. chinensis in Inner Mongolia Baiyinxile Range as the research object, different rations of nitrogen fertilizer were applied to the grassland （0, 30, 50, 80 g/m^2）. The effect of different gradients of nitrogen fertilizer on photosynthetic rate of Leymas chinensis, and the effect on grasslands of different degrading degrees were analyzed. [ Result] The photosynthetic rate of L. chine^is increased with the increase of nitrogen gradients ; in the grassland communities with different degrading degrees, the responses of the photosynthetic rate of L. chinensis to nitrogen fertilizer were different, and the response in the grassland with severe degradation was the best. [ Conclusion] Nitrogen fertilizer played an important role in enhancing the restoration degree of grassland.

关 键 词：羊草 氮肥 光合速率 

分 类 号：S812[农业科学—草业科学]