不同类型棉田昆虫群落调查的抽样方法研究

Studies on Sampling Method of Insect Community under the Different Cotton Cropping Systems

本研究运用群落生态学的原理与方法，通过种—面积（或样方数）模型的建立与分析及不同抽样面积（或样方数）条件下群落特征参数的比较与分析，探讨了不同类型棉田昆虫群落的抽样方法。结果表明，在昆虫群落调查中，平作棉和麦套棉及两类棉田的不同阶段均可采用相同的抽样方法，样方面积为１ｍ２（正方形）．最小抽样面积为１０ｍ２（或１０个样方），适宜抽样面积为１０～２０ｍ２（或１０～２０个样方），棋盘式取样方法较为理想。

The sampling method of insect community in the different cotton cropping sys- tems was determined during 1992 through analysis of the established species area(or number of samples)models and comparison of the important parameters of insect commu-nity obtained from different sizes of sampling areas or different numbers of samples。Itwas shown that the same sampling method could be applied for studies of insect communi-ty in both single cotton cropping and cotton/wheat intercropping as well as their differentstages。 The suitable sampling unit was Im2(shaped in square), the minimal sampling areawas 10m2(or 10 sampling units),and the proper sampling area was 10～20m2(or 10～ 20sampling units ). The chess board pattern was the desired method for allocation of sam-ples。