白龙江中游地震滑坡体植被初期的自然恢复能力——以陇南市武都区清水沟滑坡体为例
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摘要
在野外样方调查的基础上,对陇南市武都区清水沟地震滑坡体上的植物群落组成以及物种多样性进行详细调查和统计分析。结果表明,1)研究区域内植被自然恢复以草本植物为主,有26种,占研究区植物总数的76.5%,灌木较少,有8种,无乔木分布,植物群落组成以草本和小灌木为主,其中优势种为狗牙根(Cynodon dactylon)、马唐(Digitaria sanguinalli)、黄茅(Heteropogon contortus)、芦苇(Phragmites australis)、骆驼蓬(Peganum harmala)等;2)由于环境因子的差异,不同立地条件植物群落物种组成、群落类型以及群落结构存在差异;3)不同立地条件的环境因子不同,特别是水热光照条件组合存在差异,导致不同立地条件下植物群落的自然恢复能力存在明显差异,其自然恢复能力和抗干扰能力指数大小表现为中坡位>下坡位>上坡位。
On the basis of field quadrat survey,a study was conducted on plant community composition and species diversity by the detailed investigation and statistical analysis in Qingshuigou earthquake landslide of Wudu District,Longnan City,Gansu Province.The results showed that: 1) There were 26 dominant species of herbs which occupied by 76.5% of the natural recovery vegetation in the study area,and there were 8 species of shrubs and no arbor species distribution,and herbs and small shrub plants were dominant in community composition,and the dominant species were Cynodon dactylon,Digitaria sanguinalli,Heteropogon contortus,Phragmites australis,Peganum harmala,etc.2) There were different in the composition of community species,community types and community structure of plants among various sites due to environmental factors; 3) It was especially different in the environmental factors of the hydrothermal and illumination combination at different sites,which caused the natural restoration ability of plant community exist obvious difference.It was that middle slope position>down slope position>up slope position in the sequences of natural restoration ability and anti-interference ability index.
引文
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