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| Floristic characteristics of seed plants and its spatial distribution in Yanhe River Basin |
| Shi Haijing1,2,Wen Zhongming1,2 |
| 1.College of Resources and Environment,Northwest A&F University;2.Institute of Soil and Water Conservation,CAS/MWR: 712100,Yangling,Shaanxi, China |
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Abstract This paper,aiming at providing the detailed information on the species composition of main natural vegetation communities and their distribution in Yanhe River Basin,based on the environmental stratification sampling technique to collect the vegetation information.The results showed that there are 211 species of seed plants belonging to 148 genera in 57 families,including gymnosperms(3 species,3 genera and 3 families) and angiosperms(54 families,145 genera and 208 species) in the Yanhe River Basin.Of these species,18 species belong to pantropic families,accounting for 31.57%of the total families,and 16 species belong to temperate families accounting for 28.07% of the total families.The results also showed that there are 18 pantropic genera,accounting for 11.72% of the total genera,and 89 temperate genera accounting for 60.54% of the total genera.It was showed that the plant flora in Yanhe River Basin are mainly composed of north temperate components,but also related with tropic and subtropic flora.In generally,it is comparatively rich in species with obvious transitional characteristics.The information of the flora and its spatial distribution of the species in the Yanhe River Basin can provide concrete support for ecological restoration and re-vegetation in Yanhe River Basin.
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Received: 09 April 2008
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