藏北高原人工垂穗披碱草种群生物量分配对施氮处理的响应  

Effect of nitrogen fertilizer application on Elymus nutans biomass allocation in an alpine meadow zone on the Tibetan Plateau

作　　者：武建双[1,2] 沈振西[1] 张宪洲[1] 付刚[1,2] 

机构地区：[1]中国科学院地理科学与资源研究所,北京100101 [2]中国科学院研究生院,北京100039

出　　处：《草业学报》2009年第6期113-121,共9页Acta Prataculturae Sinica

基　　金：国家科技支撑项目(2006BACk01A04;2007BAC06B01)资助

摘　　要：在藏北高原研究高寒草甸退化区人工建植垂穗披碱草种群生物量分配及其对施氮处理的响应。结果表明,1)2年龄的人工垂穗披碱草种群在最高施氮处理175 kg N/hm2下可提高群落盖度42.0%,增加牧草产量808kg/hm2;2)表施氮肥能够促进植株个体及各构件的生长,对生物量分配模式无明显改变;3)表施氮肥处理可提高垂穗披碱草叶片生物量比重,在105 kg N/hm2处理下茎叶比最小(2.187);4)施氮处理不能明显改变其繁殖分配模式,其繁殖分配主要受遗传因素控制;5)建植早期施氮处理能促进人工草地群落植被对土壤氮、磷的吸收。Field experiments were conducted in artificial grassland sown in the alpine meadow zone on the Tibetan Plateau,to test the effect of nitrogen fertilizer application on Elymus nutans biomass allocation.The community coverage and the forage yield increased by 42.0% and 808 kg/hm^2 in the 175 kg N/hm^2 application treatment compared with the control group.The total and component plant biomass increased with the amount of nitrogen fertilizer applied,but the biomass allocation pattern was not significantly affected by nitrogen application.N-fertilization improved the quality of E.nutans.The stem/leaf reached a minimum（2.187） in the 105 kg N/hm^2 treatment.Reproductive allocation was mainly controlled by genetic factors and was not significantly affected by nitrogen fertilization.Nitrogen application can improve the assimilation of N and P from soil by artificially sown grassland plants.

关 键 词：藏北高原 人工草地 垂穗披碱草 生物量分配 施氮处理 

分 类 号：S543.906[农业科学—作物学] Q945.79[生物学—植物学]