宁夏引黄新灌区的开垦与昆虫类群的演替

NEWLY RECLAIMED YELLOW RIVER IRRIGATED AREAS OF NINGXIA AND THE SUCCESSION OF ENTOMIC GROUPS

1989～1991年对中宁县大战场和灵武县狼皮子梁的荒漠草原和垦后不久(约1～5年)的农田昆虫类群进行系统调查结果,鉴定出各类昆虫11目77科260种,其中属荒漠草原原生种88种、与农业共有种85种、农田继生种87种,其中荒漠区优势类群有伪步(虫甲)科、象(虫甲)科;荒漠垦殖后原生类群68.2%的种类消失,其余残存于田埂、渠岸、沟岸和较高的小片荒地上。

From 1989 to 1991. a systematic investigation of entomiic groups in the previous desertic steppe and newly reclaimed farming areas (1～5 years cultivation) was conducted both in Dazhanchang of Zhongning County and Langpiziliang of Lingwu County. The collection was identified as 260 species of 77 families in 11 orders——including 88 original species of desertic steppe. 85 symbiotic species of desertic & agricultural areas and 87 secondary species of agricultural areas. The dominant group in the desertic steppe was composed of Tenebrionidae, Curculionidae and other families. After reclamation. 68.2% of the species in the previous group disappeared, the rest moved to reside on the un-flooded ridges. canal banks and irreclaimed upland nearby. The entomic group in the reclaimed farming areas was composed of the remaining species of the previous desertic group, symbiotic species and secondary species. The influence of ecological changes on the entomic succession was studied, and pest control measures were suggested for the newly reclaimed farming areas.