茅坪种子植物区系研究

茅坪亚热带地区有种子植物120科446属831种；大科及较大科中主产温带的科占较大比例；大属中主要以温带类型为主；茅坪地区与太白山、化龙山作比较，其热带成分比例高于太白山（18．4％）低于化龙山（29．9％），而温带成分比例低于太白山（67．5％）高于化龙山（57．9％），这与它所处的地理位置相符合，也反映出该地处于亚热带北缘和暖温带南缘的过渡地带。茅坪植物种类丰富多样，区系成分复杂；种子植物区系具有明显的古老性，单种属所占比例大；区系以温带成分为主，同时表现出明显的过渡特点；地理成分复杂是多种区系成分的汇聚地。

Investigation of evergreen broad-leaved woody plants in Changqing National Nature Reserve in Shaanxi

o have a general knowledge of the North Subropic Zone seed plants in Maoping and lay a foundation for the classified forest management. Comprehensive research methods, namely, sample line, quadrate, document consultation and specimen identification, are employed to conduct a systematic analysis of the characteristics of the North Tropic Zone seed plants in Maoping. In the North Subtropic Zone of Maoping, there are 831 species, 446 genera and 120 families of seed plants. Among the seed plants of large families, most are from temperate zone; among the seed plants of large genera, most are of temperate zone types; the tropic zone elements in Maoping is 18.4% higher than that in Taibai Mountain and 29.9% lower than that in Huahong Mountain whereas its temperate zone elements are 67.5% lower than that in Taibai Mountain and 57.9% higher than in Huanglong Mountain, which agrees with its location in the transition zone between the North rim of the sub-tropic zone and the south rim of the warm temperate zone. The plants in Maoping are diversified and the floristic elements complicated;the seed plant flora in Maoping are of obviously ancient features and its single-genus makes up a large proportion; the flora in Maoping are mainly of temperate zone elements with obvious transitional features; the geographic components being complex, Maoping is a place where a diversity of plant flora can be found.