三江源区野生草地早熟禾的分布及群落特征

Study on Distribution Regulation and Plant Community Characteristics of Wild Poa pratensis Population in the Yangtze,Yellow and Lancangjiang River Source Region

通过查阅相关资料确定三江源区草地早熟禾种群生境范围，同时结合野外实地踏查初步选取草地早熟禾种群典型分布区域，调查三江源区草地早熟禾种群实际分布地理范围及其相应植物群落类型。研究表明：野生草地早熟禾在三江源区分布于海拔3365-4500m之间，经度范围96°30′24．96″～100°57′31．2″，纬度范围33°07′29．34″～34°46′12．9″；草地早熟禾种群适于在灌丛草甸、河漫滩地、河边、山坡、林下生长；主要群落类型有12种，在各草地类型中的重要值分别为34．63、24．25、26．12、13．46、8．97、18．27、6．08、11．40、47．40、3．74、29．56、3．69。

Through referring to related literatures to determine the habitatal spectrum of Poa pratensis population in the Yangtze,Yellow and Lancangjiang River source region （YYLSR） and combined with field in- vestigation to choose typical distributing district of Poa pratensis population preliminarily, the real geo- graphic range of P. pratensis population and its relevant community type were investigated. The results showed that P. pratensis distributed in the elevation from 3365m to 4500m, in the longitude from 96°30′24.96″to 100°57′31.2″ in the latitude from 33°07′29.34″to 34°46′12.9″. The P . pratensis population is suitable to grow in the shrub meadow, river bank, mountain slope and under forest. There were twelve community types, the importance values of P . pratensis in community types were 34.63,24. 25,26.12, 13.46,8. 97,18. 27,6.08,11.40,47.40,3.74,29.56,3.69 respectively.