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     Group B contains T.
     B由T .
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     HOMOMORPH-GROUP
     态
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     HERBACEOUS TIME
     回归草本年代
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     Herbage and vitamine toothpast
     草本维生素牙膏
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     CONCLUSION: Coumarin is the specific constituent in the group of herbal, which is the difference from the woody.
     结论:香豆精为木本自然区别于草本自然的特征成分之一
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  herbaceae
The other two are bound to higher elevations (2500 m NN, at Timmelsjoch): Caricetum curvulae (T 1), forming the mats, and Salicetum herbaceae (T 2), covering the snow-beds.
      
Las comunidades de los ventisqueros (Salicetea herbaceae) del Pirineo central
      
Se hace un estudio de las comunidades de los ventisqueros del Pirineo Central (Salicetea herbaceae) y se las compara con las de los Pirineos Orientales y Alpes Occidentales.
      
El autor publica 36 inventarios originales correspondientes a tres asociaciones: Cardamino-Gnaphalietum supini, Anthelio-Salicetum herbaceae y Carici-Salicetum retusae, de las que hace un estudio florístico, ecológico y corológico.
      
(2) Therophytic vegetation settled on soils subject to natural or artificial disturbance (class Thero-Salicornietea), including 3 associations: Suaedo-Kochietum hirsutae, Salicornietum herbaceae s.1.
      
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Based on the investigation along the transect of 10 m×1 200 m in the Dinghu Moutain,which started from 50.2 m to 476.5 m above sea level,the vertical pattern of plant community and their biodiversity were studied.There were 3 forest types and 5 communities along the transect,which consisted of a succession series.But vertical distribution was not in order.In the tree layer,the biodiversity index was in order of broad-leaved forest of mesophytes > pine and broad-leaved mixed forest > broad-leaved forest of heliophytes;In...

Based on the investigation along the transect of 10 m×1 200 m in the Dinghu Moutain,which started from 50.2 m to 476.5 m above sea level,the vertical pattern of plant community and their biodiversity were studied.There were 3 forest types and 5 communities along the transect,which consisted of a succession series.But vertical distribution was not in order.In the tree layer,the biodiversity index was in order of broad-leaved forest of mesophytes > pine and broad-leaved mixed forest > broad-leaved forest of heliophytes;In the herb layer,The biodivecsiey index was in order of pine and broad-leaved mixed forest > broad-leaved forest.Most herb groups of heliophytes grew in pine and broad-leaved mixed forest and broad-leaved forest of heliophytes.The distribution of herb groups was complex under tree canopy,and some herb groups of shade-tolerance species grew under heliophytes groups,which indicated that micro-environment under tree-crown could influence the pattern of herb group distribution obviously.

根据鼎湖山10 m×1 200 m的植物固定样带调查,沿海拔梯度对植物群落分布格局及生物多样性特性进行了分析。结果表明,本固定样带有3个森林类型,5个群落类型,构成一演替序列,但在垂直梯度上有交错现象。生物多样性指数为:乔木层,中生性阔叶林>针阔混交林>阳生性阔叶林;草本层,针阔混交林>阔叶林。阳性草本植物为主的草本群大部分生长在阳性树种为主的阔叶林和针阔混交林下,但是林下微环境变化对草本层植物优势度的影响也较大,以耐荫植物为主的草本群在阳性树种为主的阔叶林和针阔混交林也有分布,表明相同群落类型林下小环境的变化。

Using system clustering to divide the secondary successive of the abandoned farmland in the loess hilly regions of northern Shaanxi province,the similarity of lengths of years and standing conditions of the abandoned farmlands were discerned.Combining the above discernment with the quantitative ordination of DCA,the abandoned farmland successive phases and series were affirmed.The successive phases are as follows: annual weeds Artemisia scoparia+other annual weeds association→annual weeds A.scoparia assocaiation→annual...

Using system clustering to divide the secondary successive of the abandoned farmland in the loess hilly regions of northern Shaanxi province,the similarity of lengths of years and standing conditions of the abandoned farmlands were discerned.Combining the above discernment with the quantitative ordination of DCA,the abandoned farmland successive phases and series were affirmed.The successive phases are as follows: annual weeds Artemisia scoparia+other annual weeds association→annual weeds A.scoparia assocaiation→annual weeds A.scoparia Waldstet kit+perennial herbage or undershrub assocaiation→rhizoma grass Agropyron cristatum(L.) association→perennial herbage or tuft grass+annual weeds association→perennial herbage association→undershrub Lespedeza davurica association→perennial herbage + undershrub or thick tuft grass association→short rhizome and thick tuft grass association.

用系统聚类法划分陕北黄土丘陵区撂荒地的次生演替阶段,可以定量的认识不同年限、立地条件下撂荒地群落的相似性,结合DCA数量排序确定撂荒地的演替阶段或序列。其撂荒演替的各阶段分别为:一年生杂类草猪毛蒿(A rtem isia scop aria)+其它杂类草群丛→一年生杂类草猪毛蒿群丛→一年生杂类草猪毛蒿+多年生草种或小灌木的共优群丛→根茎禾草冰草(A g ropy ron crista tum)群丛→多年生草本或丛生禾草+一年生杂类草群丛→多年生草本群丛→小灌木达乌里胡枝子(L esp ed eza d avurica)群丛→多年生草本+小灌木或密丛型禾草群丛→短根茎密丛型禾草白羊草(Bothrioch loa ischaem um)群丛。

 
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