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

Du Tieying Wang Haixia (Qinghai Provincial Grassland Station, Xining 810008)  
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.
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