贵州茂兰的叶附生苔类

贵州南部荔波县茂兰地区的亚热带喀斯特森林为一类罕见的植被类型,散布在约210km_2的洼地内。3科、13属和31种叶附生苔类植物发现于这一特殊的生境中,显然由于受局部环境的长期影响,其中孕育着一些特有的种类。

THE EPIPHYLLOUS LIVERWORTS IN MAOLAN,LIBO COUNTY, SW CHINATHE EPIPHYLLOUS LIVERWORTS IN MAOLAN,LIBO COUNTY, SW CHINA

Maolan,occupying 210 km2 of dolomite and limestone region,is situated at Libo County(25°09'-25°21'N,107°52'-108°06'E),Guizhou Province,SW China,where the Karst forests,consisting of Juglandaceae,Lauraceae,Fagaceae,Ulma-ceae and Rutaceae etc.,grow in the obconical depression with 10-200 m of diameter and 10-300 m in depth.According to the measurment of Libo Weather Station the annual average of precipitation is 1420 mm,and is about 100-200 mm higher than that of the neighouring regions.The annual average of temperature is 18.3℃,and the annual average of the relative humidity is 80%.The illumination is 17100 1x at the bottom of the Karst forests at 3 p.m.in May,but at the southern top of the mountain the illumination reaches 108000 1x at the same time.From 174 specimens,collected in the Karst forests of Maolan,we find 31 species belonging to 3 families:Frullaniaceae,Radulaceae and Lejeuneaceae,and 13 genera:Frullania,Radula,Leucolejeunea,Cheilolejeunea,Ptychanthus,Colura,Leptolejeunea,Microlejeunea,Lejeunea,Cololejeunea,Leptocolea and Pedinolejeunea.Except Colole-jeunea spinosa and Leptocolea oblonga,all the species are pew to Guizhou Province.Evidentally,most of the species are common to SE Asia or southern E Asia.Maolan was uplifted after the Himalayans movement,and the Karst forests were sunken under ground gradually after the limestone and dolomite region were strongly eroded by water.In the lowland habitat,the humidity and temperature are steadily,and the relative humidity can reach 95% and the intensity is 24.6-38.5% lower than that of the top of the funnel lowland.Maolan,occupying 210 km2 of dolomite and limestone region,is situated at Libo County(25°09'-25°21'N,107°52'-108°06'E),Guizhou Province,SW China,where the Karst forests,consisting of Juglandaceae,Lauraceae,Fagaceae,Ulma-ceae and Rutaceae etc.,grow in the obconical depression with 10-200 m of diameter and 10-300 m in depth.According to the measurment of Libo Weather Station the annual average of precipitation is 1420 mm,and is about 100-200 mm higher than that of the neighouring regions.The annual average of temperature is 18.3℃,and the annual average of the relative humidity is 80%.The illumination is 17100 1x at the bottom of the Karst forests at 3 p.m.in May,but at the southern top of the mountain the illumination reaches 108000 1x at the same time.From 174 specimens,collected in the Karst forests of Maolan,we find 31 species belonging to 3 families:Frullaniaceae,Radulaceae and Lejeuneaceae,and 13 genera:Frullania,Radula,Leucolejeunea,Cheilolejeunea,Ptychanthus,Colura,Leptolejeunea,Microlejeunea,Lejeunea,Cololejeunea,Leptocolea and Pedinolejeunea.Except Colole-jeunea spinosa and Leptocolea oblonga,all the species are pew to Guizhou Province.Evidentally,most of the species are common to SE Asia or southern E Asia.Maolan was uplifted after the Himalayans movement,and the Karst forests were sunken under ground gradually after the limestone and dolomite region were strongly eroded by water.In the lowland habitat,the humidity and temperature are steadily,and the relative humidity can reach 95% and the intensity is 24.6-38.5% lower than that of the top of the funnel lowland.