三峡库区两种特有植物天然生境与迁地生境土壤特征的比较

对库区特有的濒危植物荷叶铁线蕨、疏花水柏枝天然生境和迁地保护区生境及其土壤性质进行了调查分析和比较，结果表明：荷叶铁线蕨适宜于温暖湿润且排水良好的条件下发育的酸性淋溶土，养分含量高，多为粘土。疏花水柏枝适宜于亚热气候下弱碱性、养分含量低的冲积性砂砾质初育土、能耐一定程度的盐分。中国科学院武汉植物研究所内的迁地保护区土壤为湖滨沉积物上发育的中性粘土、主要养分和盐分含量介于两种天然生境土壤之间。微量元

AN CONTRAST ON THE CHARACTERISTICS OF SOIL IN THE NATURAL HABITAT AND RE SITE RESERVE OF TWO ENDEMIC SPECIES OF THE THREE GORGES RESERVOIR REGION OF YANGZI RIVER

A field study and experiments are carried out in details about the characteristics of the habitat and soil in the natural distributing region and planting site in the re site reserve of the two endangered species of the Three Gorge Reservoir Region:Adiantum reniforme var.sinense and Myricaria laxiflora.It's suggested in the result that:Adiantum reniforme var.sinense prefers the warm,wet and well drai ning situation,in which case it has an acid clay with high degree of salt leaching,high content of nutrients.Myricaria laxiflora,on the other hand, prefers the alluvial soil with sand and gravel in subtropics climate.The soil is of weak alkalinity, has low content of nutrient but moderate salt.The soil at the re site reserve in Wuhan Institute of Botany of Chinese Academia is a kind of neutral clay,which is deve loped from the deposit on lakeside.The content of the chief nutrients and salts are mainly between that of the soil samples from natural habitats of the two endangered species,and its contents of the trace elements are rather different from that of the soil in natural habitats of Adiantum reniforme var.sinense.