摘要
以南太行丘陵区为例,针对不同生活型植物的根群挤在同一层片中的情况,研究植物地境生态因子多态性,确定"乔木+灌木"优势植种组合的适生因子空间,得出结论:(1)丘陵生态子系统优势植种组合为:构树+黄荆、柏树+黄荆、榆树+黄荆、臭椿+黄荆、火炬树+黄荆、楝树+黄荆和构树+酸枣.0～20 cm为一年生植物地境稳定层,20～100 cm为以乔木、灌木为主的多年生植物地境稳定层.(2)丘陵生态子系统不同优势植种组合有不同的适生范围,地境的有机质含量、含盐量、土壤氮磷钾综合指数均有所不同.(3)丘陵生态子系统不同优势植种组合共生的地境最适范围:含水率为25.80％～30.45％,有机质含量为0.71％～2.95％,含盐量为0.75～1.33 mg·g-1,土壤氮磷钾综合指数为1.03～1.52.
Abstract
Taking the hilly and mountainous region of the South Taihang as an example,this study focused on the situation where the root systems of different plant life forms were crowded in the same layer,investigated the poly-morphism of ecological factors in the plant habitat,and determined the suitable factor space for the"arbor+shrub"dominant plant combinations.Conclusions are presented as follows.(1)The dominant plant combinations in the hilly ecological subsystem include Broussonetia papyrifera+Vitex negundo,Cupressus funebris+Vitex negundo,Ulmus pumila+Vitex negundo,Ailanthus+Vitex negundo,Rhus Typhina+Vitex negundo,Melia azedarach+Vitex negun-do,and Broussonetia papyrifera+Ziziphus jujube.The 0～20 cm layer is a stable layer for the annual plant habitat,and the 20～100 cm layer is a stable layer for the perennial plant habitat dominated by arbors and shrubs.(2)Differ-ent dominant plant combinations in the hilly ecological subsystem have different suitable ranges,with variations in the organic matter content,salt content,and comprehensive index of soil nitrogen,phosphorus,and potassium.(3)The most suitable coexistence range for different dominant plant combinations in the hilly ecological subsystem is a mois-ture content of 25.80％～30.45％,an organic matter content of 0.71％～2.95％,a salt content of 0.75～1.33 mg·g,and a comprehensive index of soil nitrogen,phosphorus,and potassium of 1.03～1.52.
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