论文部分内容阅读
采用定点系统调查的方法对豇豆田间生态系统中斑潜蝇及其天敌结构与动态进行了研究.结果表明:豇豆田间斑潜蝇及天敌复合生态系统中(complex ecosystem)昆虫种类有8种,优势种群为美洲斑潜蝇.在豇豆整个生育期,美洲斑潜蝇的种群数量呈上升趋势,而复合生态系统的多样性和均匀度呈下降趋势.经主成份分析表明对复合生态系统作用最大的是寄生蜂.对各时期复合程度的评价发现,前期的复合程度高,而后期的复合程度低.
The structure and dynamics of the leafminers and their natural enemies in the cowpea field ecosystem were studied by using the fixed-point systematic investigation.The results showed that there were 8 insect species in the complex ecosystem of the cowpea field and its natural enemies, The population of L. macrorrhynchos was in the whole developmental period of the cowpea, the population of L. occidentalis showed an upward trend, while the diversity and evenness of the composite ecosystem showed a downward trend.Analysis by principal component showed the greatest effect on the compound ecosystem Is a parasitic wasp.The evaluation of the degree of compounding in each period found that the degree of compounding in the early period was high and the degree of compounding in the late period was low.