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馬尾松毛虫越冬幼虫空間分布型及其抽样技术
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摘要:
马尾松毛虫越冬幼虫空间分布型是属负二项分布,其分布基本成分是疏松的个体群。采用Iwao法测定聚集度和资料代换为佳,越冬期虫情调查以对角线法抽样精度较高,并可通过调查树干0~2米或树冠第一轮虫口,建立回归式推算全树虫口密度。
关键词:  马尾松毛虫,分布型,抽样
DOI:
基金项目:
SPATIAL DISTRIBUTION AND SAMPLING TECHNIQUES OF THE OVERWINTERING MASSON''''S PINE CATERPILLAR LARVAE
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Abstract:
The spatial distribution pattern of the overwintering larvae of the Masson's pine caterpillar is a negative binomial one and Iwao's test is the best for the aggregation analysis and datum transformation. In diagonal sampling, which gives comparably higher precision, larval numbers at o-2m in height of trunks and on the first whirl from the ground are counted to set regression equation for the estimate of larval number all over a tree.
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