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1980～1983年我们对棉田蜘蛛进行观察和调查研究,结果如下: 一、棉田蜘蛛的种类及其数量变化每年6～11月份在各类型棉田中共采集蜘蛛标本5184头,经鉴定本地棉田蜘蛛计有13科61种。其中微蛛科5种,球腹蛛科6种,园蛛科6种,肖蛸科9种,管巢蛛科8种,跳蛛科10种,狼蛛科7种,漏斗蛛科1种,平腹蛛科1种,蟹蛛科3种,卷叶蛛科1种,盗蛛科3种,栅纺器蛛科1种。棉田蜘蛛种群虽多,其构成棉田生态系统的主要蜘蛛种群有草间小黑蛛Erigonidium graminicola Sunde vall,八斑球腹蛛Thersidion octomaculatum Boes et str,三突花蛛(Misumenops tricuspidatus Fabr),管巢蛛(以Clubiona hummedi为主)四种。其余不少种类仅在田间偶见。6～9月统计,蜘蛛种群占捕食性天敌总量的59.50～78.23%,平均67.40%(见表1)。上述四种蜘蛛占蜘蛛混合种群的85.29～97.78%,平均92.46%(见表2)。四种优势种的发生量虽逐月加大,但种群数量比例也随棉花生育期的不同而有差异。棉花前期
From 1980 to 1983, we observed and investigated the spiders in cotton fields. The results are as follows: I. Types and Quantities of Spiders in Cotton Field There were 5184 spider specimens collected from June to November each year in the cotton fields. 13 families and 61 species. Among them, there are 5 species of Araceae, 6 species of Araceae, 6 species of Ornithodidae, 9 species of Hylobates, 8 species of Tridaryidae, 10 species of Tarantulas, 7 species of Tarantulas, 1 species of Funidae , 1 species of flat belobium, 3 species of crabgrass, 1 species of leafrolididae, 3 species of spider spider, 1 species of spider spider. Although there are many spider populations in cotton field, the main spider populations in cotton ecosystem are Erigonidium graminicola Sunde vall, Thersidion octomaculatum Boes et str, Misumenops tricuspidatus Fabr, (Mainly Clubiona hummedi) four. Many other species are only occasionally seen in the field. From June to September, the spider population accounted for 59.50-78.23% of the total predators, with an average of 67.40% (Table 1). The above four spiders accounted for 85.29 ~ 97.78% of the spider mixed population, with an average of 92.46% (Table 2). Although the occurrence of four dominant species increased month by month, the proportion of population also varied with the growth period of cotton. Cotton early