基于物种性状的两种高寒草甸优势牧草对施肥的响应

aking dominant grass Elymus nutans and Kobresia capillfolia in the eastern Qinghai-Tibetan Plateau as experimental materials，we studied the response of height，number of tillers，number of leavers，specific leaf area (SLA)，leaf N content and species relative abundance ( SRA ) in the community to different fertilization treatments (0gom-2，15gom-2，30gom-2，60gom-2) in field condition. Our results showed that all five trais of Elymus nutans had significant increase following fertilization addition. The height and leaf N content of Kobresia capillfolia also had significant increase with the addition of fertilization，but the increase rate was obviously less than Elymus nutans; fertilization had no significant effect on the number of tillers，number of leavers and SLA of Kobresia capillfolia; species relative abundance ( SRA ) of Kobresia capillfolia had significant decline with the addition of fertilization，which was inverse with Elymus nutans. Differences in morphological plasticity and species relative abundance (SRA) between Kobresia capillfolia and Elymus nutans indicated that they had different plasticity to fertilization，Elymus nutan was more adaptive to high fertilization than Kobresia capillfolia.