青海省海南州天然草地及牧草多样性分析

DIVERSITY ANALYSIS OF NATURAL GRASSLAND AND HERBAGES IN HAINAN PREFECTURE, QINGHAI PROVINCE

通过对海南州天然草地牧草多样性分析，进一步了解其天然草地的生态环境，为合理利用、改良和保护草地提供参考依据。据分析，温性草原类牧草多样性指数在３．２～４．６之间，多样化程度较低；高寒草原类、高寒草甸类牧草多样性指数在３．３～６．６之间，多样化程度高于温性草原类。从总体而言，海南州草地牧草多样化程度较低，主要是水、热两大因子分配不均所致。有些草地型虽然牧草种类较多，但由于分布不均匀，导致了牧草多样化程度较低。

Herbage diversities of natural grassland were analysed in Hainan prefecture, that the ecological environment of natural grassland in this prefecture could be better understood, furthermore, the fundmental basis for reasonal utilization, improvement and protection of grassland could be provided. According to caculation and analysis, herbage diversity of temperate grassland was between 3.2 and 4.6, the diversity level was lower than that of other types; herbage diversity indices were between 3.3 and 6.6 for alpine grassland and alpine meadow for which diversity levels were higher, the diversity degree of grassland was higher than that of temperate grassland. Generally, the diversity of grassland in Hainan prefecture is lower, which results from the different distribution of two facts: water and heat. The species number of herbege is more in some types of grassland, but their distribution aren’t even, so the diversity indices are lower.