摘要
为探明喀斯特地区不同演替阶段植物群落天然更新能力及其影响因素,为石漠化区植被恢复及综合治理提供理论依据,通过样地调查,选取反映群落更新库特征的土壤种子库密度、幼苗库密度、母树密度、反映影响群落更新库变化的关键环境因素土层厚度和群落盖度等5个指标,对贵州典型喀斯特地区不同演替阶段植物群落更新能力进行研究。结果表明:1)群落天然更新能力排序为灌木群落阶段>乔林阶段>灌草群落阶段>草本群落阶段>石漠化阶段;2)更新库对群落天然更新能力的影响远大于环境因子,尤其是灌木群落阶段和乔林阶段群落;3)环境因子对草本群落阶段更新能力影响较大;4)石漠化阶段群落天然更新能力既受更新库又受环境因子的严重制约。
Natural regeneration ability of plant communities in different succession stages in Guizhou typical Karst area were studied by indexes reflecting the community regeneration characteristics,such as density of soil seed bank,density of seedling bank,density of seed trees,and other 2 key environmental factors which reflected the impact on changes of community regeneration bank as thickness of soil layer and community coverage in the sampling sites,to explore the regeneration ability and their influencing factors,and to provide theoretical basis for vegetation restoration and integrated management in Guizhou rocky desertification Karst areas.The results showed that：1） The order of natural regeneration ability of communities was shrub community stage arbor forest stage shrub-herbaceous communities stage herbaceous communities stage rocky desertification stage;2）The impact of regeneration bank on natural regeneration ability of community was far greater than that of the environmental factors,especially in shrub community stage and arbor forest stage;3）Environmental factors had greater impact on natural regeneration ability in herbaceous communities stage;4）Natural regeneration ability of community in rocky desertification stage was not only restricted badly by regeneration bank but also environmental factors.
出处
《贵州农业科学》
CAS
北大核心
2011年第6期155-158,共4页
Guizhou Agricultural Sciences
基金
国家科技支撑计划项目"喀斯特高原峡谷石漠化综合治理技术与示范"(2011BAC09B01)
"211工程"三期重点学科建设项目"西南喀斯特演化过程与生态系统调控"(kst200904)
贵州省科技攻关项目"喀斯特地区次生林地结构与森林分类经营技术研究"[黔科合NY字(2009)3052]
关键词
天然更新能力
植物群落
演替阶段
喀斯特
natural regeneration ability
plant community
succession stages
Karst
