粤北和粤东北若干珍稀濒危野生植物的种群特征

在2000～2007年间野外调查的基础上,用核实法或样方法研究了粤北和粤东北部分山区15个县市的珍稀濒危保护野生植物,计31科40属48种.重点介绍了有新分布区或呈群落状分布的7种植物的种群大小、植株高度、年龄结构等主要特征.其中在平远新发现10株仙湖苏铁野生植株;伯乐树在连州的种群数量达160株,以幼苗为主;在仁化篦子三尖杉达300株;平远半枫荷有100株;任豆新见于清新和始兴,数量1000株以上;和平、河源和蕉岭发现苏铁蕨种群,合计数百株;始兴新发现57株银鹊树.最后分析了这些珍稀濒危植物的濒危等级和致危因素,提出了相应的保护管理策略.

Population Characteristics of Some Rare and Endangered Plants in North and Northeast of Guangdong Province, China

A population field survey of rare and endangered plant species was conducted in north and northeast Guangdong Province, China from 2000 to 2007. Locations and distributions of the rare, endangered and state key protected plants in the regions were studied by confirmation in the field and plot methods. In total, 48 species, belonging to 31 families and 40 genera were found in the regions including 15 counties or cities. Population characteristics, such as size, plant height and diameter breast height (DBH) structures and living habitats of 7 species with concentrated distribution patterns or identified in new distribution areas were studied in details. Population of Cycas fairylakea in new recorded area of Pingyuan County represented 10 individuals. Bretschneidera sinensis population found in Lianzhou City was represented by 160 individuals, most being seedlings. Cephalataxus oliveri population in Renhua County was represented by 300 individuals. 100 individuals of Semiliquidambar cathayensis were found in Pingyuan County. Zenia insignis which was first recorded in Qingxin County and Shixing County had a population of more than 1 000 individuals. Brainea insignis recorded in Heping County, Heyuan City, and Jiaoling County, had a total population of more than 100 individuals. Fifty-seven individuals of Tapiscia sinensis were recorded in Shixing County. Conservation strategies for these rare and endangered plant were provided based on an analysis of endangered status and other factors.