association complex

Sequence of Preferential Protection of Associations of Forest Vegetation in Puwa Nature Reserve, Beijing;

北京蒲洼自然保护区植物群丛的优先保护顺序

Through the outdoor investigation and statistical analysis in Tongledashan Nature Reserve,the vegetation of this reserve could be divided into 5 vegetation types,8 vegetation subtypes,15 formations and 21 associations.

通过野外调查和统计分析,同乐大山自然保护区植被可划分为5个类型,8个亚型,15个群系,21个群丛,其中以南亚热带常绿阔叶林为主,并有暖性针叶林、暖性竹林、南亚热带常绿阔叶灌丛、草丛等类型。

Three association classes, two association groups and thirty associations were identified by the community classification methods.

〕在广西各个自然区域都有广泛的栽培,本文利用群落分类的方法将广西的杉木林划分出3个群丛纲,2个群丛组,30个群丛。

Windbreak Effects of Different Scheme Artemisia ordosica Shrub for Sand-Fixation in Low Cover;

不同分布格局低覆盖度油蒿群丛防风效果

4 association groups were classified by means of cluster analysis (Bray-Curtis distance) and two-dimensional polar ordination, which are: Smilax sta;is-Populus dau.

经Bray－Curtis距离等级聚类分析和极点排序，划分出4个群丛组，即鞘柄菝奖—山杨—锐齿栎群丛组，华北绣线菊—漆树＋山杨—锐齿栎群丛组，箭竹—华山松＋油松—锐齿栎群丛组，榛子—板栗—锐齿栎群丛组。

The Chinese pine formation could be divided into 3 association groups of L.

通过Noy－Meir分离法和PCA排序分析，把火地塘林区油松天然林的优势灌木划分为照山白、绿叶胡枝子、粉背黄栌、华北绣线菊等4个生态种组；据此将油松群系划分为3个群丛组。

Low-covered shrub is a kind of vegetation that widely distributes and has important significance in arid and semi-arid areas,and is also the reference vegetation that should be obeyed in restoring.

低覆盖度灌木群丛是干旱、半干旱区广泛分布且具有重要意义的植被,也是人工修复沙地应遵从的植被。