湿地松粉蚧空间分布型及抽样技术的研究
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STUDIES 0N THE SPATIAL DISTRIBUTION PATTERNS OF Oracella acuta AND SAMPLING TECHNIOUES
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    摘要:

    湿地松粉蚧在湿地松林间呈聚集分布。湿地松粉蚧虫口密度在湿地松树冠东,南,西,北向之间无显著差异,而在树冠上,中,下层之间有极显著差异,虫口密度大小是树冠上层>中层>下层,5种抽样方法中,以双对角线法最佳,其次为Z字形法,每1/15km^2湿地松抽查样树10株为适宜。

    Abstract:

    The distribution of the Loblolly Pine Mealybug Oracella acuta(Lobdell)exhibited an aggregation pattern in Pinus elliottii pine plantations.In the samecrown level,the population density of Oracella acuta did not differ significantlyamong the eastern, southern,western and northern shoots.The populationdensity was highly significantly different among the three crown layers,namely,high layer>mid-layer>low iayer.Different sampling methods were compared,the intersecting diagonal method was found to be the best and the Z-shapedmethod the next best.One hundred and flfty trees per ha were sampled.

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李奕震 苏星.湿地松粉蚧空间分布型及抽样技术的研究[J].华南农业大学学报,1994,(4):52-57

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