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农业生态系统中天敌多样性的保护和维持是当前生物多样性科学研究中的薄弱环节。作者对江苏通州市1970’s后期到1980’s前期和近年(2003~2004)棉田中捕食性节肢动物的多样性作了比较研究。调查表明,1970’s后期到1980’s前期,通州市棉田生态系统中常见的捕食性节肢动物的主要优势种维持在10余种。2003~2004年,在同一区域,采用相同的方法进行调查。结果表明,棉田的天敌物种多样性锐减,仅有龟纹瓢虫、草间小黑蛛等少数几类天敌。对棉田天敌的物种多样性锐减的原因作了初步的定性分析。
The conservation and maintenance of natural enemies diversity in agro-ecosystems is currently the weak link in scientific research on biodiversity. The authors compared the diversity of predatory arthropods in cotton fields from the late 1970s to the early 1980s and from 2003 to 2004 in Tongzhou, Jiangsu Province. The survey shows that during the period from the late 1970s to the early 1980s, the predominant species of predatory arthropods common in the cotton ecosystem in Tongzhou maintained at more than 10 species. 2003-2004, in the same area, using the same method to investigate. The results showed that the diversity of natural enemies in cotton fields dropped sharply, only a few kinds of natural enemies such as the ladybug, lady grass and other small black spider. A preliminary qualitative analysis of the sharp decline in species diversity of natural enemies in cotton fields was made.