摘要
本文利用二歧指示种分析法TWINSPAN将广西热带石灰岩季节雨林的30个样地划分两大类共6个群落:洼地季节雨林(1)火焰花+萍婆群落;(2)海南风吹楠+人面果群落。石山季节雨林(1)东京桐+广西顶果豆群落;(2)假肥牛树+安南牡荆群落;(3)肥牛树群落;(4)肥牛树+蚬木群落。文章还利用无偏对应分析法DCA对群落进行了排序,指出由洼地至山坡水分条件由湿到干是影响群落变化的主导因素。环境的封闭程度对群落变化也有一定影响。
Thirty samples of tropical limestone forests in Guangxi were ciassit-ied into six formations using Two-Way Indicator Species Analysis (TW-INSPAN) and these six formations constitute two vegetation types of hi-gher class. The classification results are: Ⅰ. Valley seasonal rain forest:(1)Form. Saraca chinensis+Sterculia nobilis(2)Form. Horsfieldia hainanensis+Dracontomelon duperreanum. Ⅱ. Limestone hill seasonal forest: (1)Form.Deutzianthus tonkinensis+Acrocarpus fraxinifolius var. guangxiensis(2)Form.Cleistanthus petolottii+Vitex annamensis(3)Form. Cephalomappa sinensis(4)Form. Cephalomappa sinensis+Burretiodendron hsienmu. The sampleswere also ordinated using DCA (Detrend Correspondence Analysis).The first axis of ordination reflected water gradient from wet valley todry hill. The second axis was shade gradient.
