广西弄岗喀斯特区域不同群落的稳定性评价分析

选取群落本地种盖度和多样性等5个方面共9项具有表征群落稳定特性的主要指标构成指标体系,运用主成分分析法和灰色关联度分析法,综合评价分析了广西弄岗喀斯特区域群落稳定性;并根据稳定性分级公式将群落划分为强、中、差三个等级。结果表明:肥牛树(Cephalomappa sinensis)+秋枫(Bischofia polycarpa)-网脉核实(Drypetes perreticulata)-高脚沿阶草(Ophiopogon dracaenoides)等群落的稳定度指数较大。飞机草(Eupatorium odoratum)+三叶葛藤(Pueraria phaseoloides)等群落的稳定度指数较小。肥牛树+秋枫-网脉核实-高脚沿阶草等8个群落为强稳定性级别群落,苦楝(Melia azedarach)+任豆(Zenia insignis)-野桐(Mallotus japonicus)-蔓生莠竹(Microstegium fasoiculatum)+飞机草等4个群落为中等稳定性级别群落,飞机草+三叶葛藤群落、红花三宝木(Trigonostemon lutescens)+潺槁树(Iitsea glutinosa)-飞机草等14个群落为差稳定性级别群落。植被的稳定性大小顺序(原生性天然林>次生天然林>灌丛/人工林>草丛),反映了演替稳定性规律,即群落稳定性随着演替的进行而增高。 

Studies on the stability of different communities in Nonggang karst region of Guangxi

Five aspects of nine stability evaluating index such as coverage of local species and local species diversity are selected to constitute index system. And then, the stability of the Southwest Guangxi karst communities are evaluated and analyzed comprehensively by means of principal components analysis and grey relational analysis. Correspondingly, three grades(highly, moderately and lowly stable community)of stableness are classified according to classification formula of stability. The results show that: the communities such as Cephalomappa sinensis + Bischofia polycarpa - Drypetes perreticulata- Ophiopogon dracaenoides community, have higher stability index, while the com munities such as Eupatorium odoratum+ Pueraria phaseoloides community have lower stability index. The community Cephalomappa sinensis+ Bischofia polycarpa- Drypetes perreticulata- Ophiopogon dracaenoides and other seven com munities are classified as the highly stable community; the community Melia azedarach+ Zeniain signis- Mallotus japonicus- Microstegium fasciculatum+ Eupatorium odoratum and other three communities are classified as the moderately stable community; the community Eupatorium odoratum+ Pueraria phaseoloides, Trigonostemon lutescens+ litsea glutinosa- Eupatorium odoratum and other thirteen com munities are classified as lowly stable community. The order of vegetation stability, native forests> secondary natural forest> shrub/ plantation> grass, reflects the stability of the law of succession, i.e. community stability increases as the succession goes on.