中国特有植物银杉林的现状和未来

The present status and the future of Cathaya argyrophylla forest

银杉是我国特有的珍稀植物，仅在四川、贵州、湖南和广西四省区残存。其地理分布可归结为大娄山、越城岭、八面山和大瑶山等４个集积地。现有的银杉林全部为混交林，主要有７个类型：银杉－甜槠混交林、银杉－石栎混交林、银杉－亮叶桦混交林、银杉－广东五针松混交林、银杉－长苞铁杉混交林、银杉－大明松混交林及银杉－南方铁杉－福建柏混交林。银杉处于优势地位，群落相对稳定，但银杉更新不良。在自然演替中，阔叶树种的入侵对银杉构成严重威胁，最终将会取代银杉。为了保护银杉，在林地对阔叶树进行透光伐，在林窗人工移植银杉幼苗幼树是必要的。

Cothaya argyrophylla is a China endemic and rare species distributed in Sichuan,Guizhou,Hunan and Guangxi Provinces.This leads to four geographic distribution centers of this species:Daloushan, Yuechenglin.Bamianshan and Dayaoshan.All Cothaya argyrophylla forests are normally mixed and there are seven Cathaya community types.Cathaya argyrophlla is one of the dominant species in these types,but its natural regenerations are poor.Cathaya argyrophylla is theatened by the invasion of broad-leaved species and is likely to be replaced by them during the succession.To preserve Cathaya argyrophylla,two effective methods are suggested in the present paper:the preliminary thinning of the broad-leafed species and the transplanting of the sapling of Cothaya argyrophylla in gaps.