常规耕作、免耕和旧田制土壤表面节肢动物种群的比较

Agro-Ecosystems Pub Date : 1983-02-01 DOI:10.1016/0304-3746(83)90007-0

A.Y. Blumberg, D.A. Crossley Jr.

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引用次数: 101

摘要

采用诱捕法比较了常规耕作和免耕作高粱及其邻近老田土壤表面节肢动物种群数量。在整个季节的7个24小时采样周期中，计算系统之间的总体多样性(H)和相似性商数(QS)。NT土壤表层节肢动物多样性高于CT和of。虽然每个系统都是不同的(任何两个系统的共同物种少于30%)，但在干旱时期和高粱抽穗后，NT与of最相似，与CT最不相似。蜘蛛所代表的个体和种类百分比在NT(30%和15%)和of(22%和17%)中相似;CT上的比例要低得多(11%和8%)。尽管普遍预测在不施用杀虫剂的情况下，华北地区的害虫种群数量会增加，但华北地区和华北地区的产量(高粱生物量)没有显著差异。昆虫掠食的叶面积，试验区(28%)大于试验区(12%)。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Comparison of soil surface arthropod populations in conventional tillage, no-tillage and old field systems

Soil surface arthropod populations in conventional tillage (CT) and no-tillage (NT) sorghum and adjacent old field (OF) were compared using pitfall trap captures. Overall diversity ( $H$ ) and similarity quotients (QS) between systems were calculated for each of seven 24-h sampling periods throughout the season. Diversity of the soil surface arthropods was greater in NT than either CT or OF. Although each system was distinct (any two of the systems had less than 30% of their species in common), NT was most similar to OF and least similar to CT during a period of drought and after heading of the sorghum. Percentages of individuals and species represented by spiders were similar in NT (30 and 15%) and OF (22 and 17%); percentages were substantially less in CT (11 and 8%). Yields (biomass of sorghum) in CT and NT were not significantly different despite the generally predicted higher pest populations in NT in the absence of insecticides. Leaf area grazed by insects was greater in CT (28%) than in NT (12%).

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