张家川回族自治县草地蜘蛛调查

本文对张川县草地蜘蛛的种类、分布、发生密度及种群结构作了调查研究。调查共采集的42种蜘蛛在山地草甸、山地森林草原、山地灌丛草甸和山地草原中的分布比例依次分别为35.7％、52.4％、50％和59.5％。结果表明,各类不同草地生境中,蜘蛛的种类分布,随海拔升高而逐渐减少,天然草原蜘蛛的种群平均密度为5.1头/米~2,其中山地森林草原最高,达9.4头/米~2;人工草地(苜蓿地、红豆草地)为1.2头/米~2。农田仅为0.6头/米~2。

A Survey of Grassland Spiders in Zhang Chuan County,Gansu Province

The species and their distribution and population density of spiders on grassland of Zhang Chuan were systematically investigated in summer 1986.A total of 42 species of spiders were found on mountain me adow, mountain forest grassland, mountain brush meadow and mountain grassland. The percentage of their distribution was 35.7%; 52.4% 50.0%; 59.5% respectively. The density of spiders was different on natural and artificial grassland. It was 5.1/M~2 on natural grassland, with supreme density of 9.4/M~2 on mountain forest grassland, while on artificial grasslands (alfalfa, sainfoin), it was 1.2/M~2. This paper dealt with population structure of spiders in various habitats. The results showed that the dominant species of spiders were Pardosa astigera Alopecosa Licenti, Araneus dispicatus.Tetragnatha squanata. T.pinicala. Philodmus cespitum, Synaema globsa, Erigonidium graminicola, Erigone promines and Gnaphosa roeweri.