豫北沙地次生植被类型及其演替

The Vegetation Types and Their Succession on Sandyland in Northen Henan Province

沙地是豫北平原非耕作的次生植被最集中的土地类型。在固定沙地分布着人工林、天然灌丛和草丛群落,半固定——流沙为一年生植物和沙生植物为主的群聚,在低湿沙地以湿生和根茎型植物为主。基质条件和人为影响是豫北沙地植被演替的主要因素。主要的演替形式是由无植被向固定沙地稳定群落的进化型演替。酸枣、荆条灌丛是沙地次生植被演替中较高级并能长期稳定的群落类型。

The investigation area belongs to Warm—temperate and Semi—humid Zone. The dominant plant species on the sandy land are: Imperata cylindrica var. major, Zizyphus jujuba, Robinia pseudoacacia, Platycladus orientalis, Agriophyllum squarrosum, Cyperus rotundus, Cynodon dactylon etc. The major succession processes of vegetation association are consistent with the process from which the shifting sand turned into fixed sand . the models of succession series are: Comm. Cyperus rotundus—Agriophyllum squarrosum—Imperata cylindrica var. major . The Zizyphus jujuba and Vitex negundo var. heterophylla are senior and stable association in the area, they maintain stable for a long period without any external disturbances.