Female and male proportions of artificial Hippophae rhamnoedes ssp. sinensis forest in soft sandstone area
HU Jian-Zhong-；Du-Wen-Yan-；Guo-Hai-；Yan-Li-Jiang-；Liu-Li-Ying-；He-Jing-Liang-；Guo-Jian-Yang-；Jia-Bo
1.Plant Development Center for Soil and Water Conservation,Ministry of Water Resources,100038;2.Chinese Academy of Forestry,100091;3.College of Soil and Water Conservation,Beijing Forestry University,100083: Beijing,China
Abstract：Hippophae rhamnoedes ssp.sinensis is a very suitable shrub for afforestation in the northern China especially in the Loess Plateau,which has been planted for more than twenty years in China under the careful design and strong management.The ecologic and economic benefits of which have been achieved,and play a key role to increase farmer and enterprises' incomes.The sex ratio rule of dioecious species is very important for the rehabilitation with seabuckthorn in the soft sandstone area of the adjacent area of Shanxi,Shaanxi,and Inner Mongolia of China.Survey and statistics for 36 kinds of artificial sea-buckthorn stands show that the female ratio to male is 1∶2.6 as a whole,while the male quotient of young stand is very high with the highest of 10 times as high as that of female,and the female ratio to male is about 1∶2 or so for 5 to 8 year's old stands.The female ratio to male for alluvium,sand soil,and loess is 1∶2.2-2.4 whereas the ratio is 1∶3.4 for the forest in the soft sandstone site condition.Rigorous site conditions in the research area cause the more proportions of male plants.Economic or eco-economic types of Hippophae rhamnoedes ssp.sinensis forest or cash forest should be set up in good site conditions like the bottomland in wide valley for more economic benefits,while the ecological type of Hippophae rhamnoedes ssp.sinensis forest in bad site conditions for ecological benefits consideration.
2009, Vol. 7 
