摘要
红桦（Ｂｅｔｕｌａａｌｂｏ－ｓｉｎｅｎｓｉｓ）林是太白山森林植被的重要类型，在山地植被垂直带谱中成为落叶阔叶林带的一个亚带，南坡分布于海拔１９５０─２６５０ｍ，北坡分布于海拔２２００─２７５０ｍ。太白山红桦林可分为７个类型：Ⅰ红禅＋辽东栎林，Ⅱ红烨＋辽东栎＋华山松林，Ⅲ红桦＋华山松林，Ⅳ红样纯林，Ⅴ红桦＋华山松＋牛皮桦林，Ⅵ红桦＋牛皮桦＋巴山冷杉林，Ⅷ红桦＋牛皮桦林。随着海拔高度的升高，红桦林各类型依次有规律的分布，但红桦始终占据优势地位，并有着相对稳定的结构组成。红桦林以高大粗壮的红桦个体为主，林内更新苗较少，天然更新状况普遍不良。优势种群（红桦）年龄分析表明，红桦种群为衰退种群。红桦种群的衰退特征反映出红桦林的消退发展趋势。目的本区红桦林多属成熟林或过熟林，应加强人工更新。
Betula albo-sinensis forest is an important type of forest vegetation of the Taibai Mountain region, distributed From 1950 to 2650m on the south slope and from 2200 to 2750m above sea level on the north slope.Using clustering analysis(UPGMA),twenty plots of Betula albo-sinensis forest were classified into seven types:i) B. albo-sinensi+Quercus liaotung-ensis forest; ii) B. albo-sinensis+Q.liaotungensis+Pinus armandii forest;iii)B. albo-sinensis+P. armandii forest; iv) B. albo-sincensis forest;v)B. albo-sinensis P armandii+B. utilis fargesis forest;vi) B. albo-sinensis+B. utilis+Abies jargesii forest;vii) B albo- sinensis+ B. utilis forest.Seven types of B,albo- sinensis forests were regularly distributed in this order along the altitudinalgradient, but B. albo-sinensis forest always dominates and the forest structureis relatively stable.The analysis of the Bctula albo-sinensis population structure,dynamicsand natural regeneration indicated the Betula albo-sincntis forest was in a de-grading stage.Betula albo-sinensis forests are mature or over-mature at present,artificialregeneration should be strengthened.
出处
《植物生态学报》
CAS
CSCD
北大核心
1994年第3期261-270,共10页
Chinese Journal of Plant Ecology
关键词
太白山
种群
红桦
森林
Taibai Mountain
Betula albo-sincnsis forest
Population
