Study on Spermatophyte Constituent and Floristic Element of Ganjiahu Nature Reserve in Xinjiang

There are 233 species of seed plants in Ganjiahu Nature Reserve, belonging to 137 genera and 42 families; the largest family Chenopodiaceae (69 species) in this flora is also the largest family in halophytes flora in Xinjiang. There are totally 69 genera and 99 species of halophytes in Ganjiahu Nature Reserve, occupying 50.4% and 64.9% of the total number of genera and species respectively. At family level, besides cosmopolitan family, the temperate type and tropical to temperate type which contains 10 species respectively are the main elements. At genus level, the geographical components are mainly the Mediterranean, W. Asia to C. Asia distribution type and subtypes, containing 45 genera, occupying 39.8% of the total number of genera. At species level, the geographical components are mainly Temperate floristic elements (53.1%) and Old Mediterranean floristic elements (42.4%). C. Asia distribution type (27.0%), Temperate Asia distribution type(25.7%) and Old World Temperate distribution type(21.6%) are important in this flora. The basic characteristics of the flora are as follows: Dominant family is prominent in the nature reserve; The genera with single species and few species occupied high percentage of the total number; The flora is various in floristic elements; There are some ancient floristic elements; Endemic characteristics of species are not obvious; The flora is of typical halophyte and typical temperate arid desert characteristics; 11 rare and endangered species of national or provincial level and 3 species which are regarded as probably disappeared species from Xinjiang are found in the nature reserve, all of these species have important protective values.