龙眼叶瘿蚊虫瘿空间分布型及理论抽样数研究  

Spatial distribution and theoretical sampling of galls induced by longan leaf-gall midge,Asphondylia sp.

作　　者：胡菡青[1] 潘少霖[1] 陈瑾[1] 韦晓霞[1] 蔡子坚[1] 吴如健[1] 

机构地区：[1]福建省农业科学院果树研究所,福建福州350013

出　　处：《福建农业学报》2010年第6期731-735,共5页Fujian Journal of Agricultural Sciences

基　　金：福建省属公益类科研院所基本科研专项(2009R10029-9)

摘　　要：在对龙眼园龙眼叶瘿蚊Asphondylia sp.虫瘿调查分析的基础上,应用6个聚集度指标和2种回归分析方法,对龙眼叶瘿蚊虫瘿的空间分布型进行研究,并进行理论抽样数和影响因素分析。结果表明,叶片上虫瘿主要分布于叶片背面的主脉和主侧脉上,主脉两侧的区域虫瘿数量相近,在叶片不同区域的虫瘿分布比率依次为中部>上层>下层,其中在中部区域的虫瘿分布比率为39.80%,在主脉上主要分布在叶片上层区域,在主侧脉上以叶片中间区域分布比率最高;所有的指标表明,叶片上龙眼叶瘿蚊虫瘿在一切密度下呈聚集分布,分布的基本成分为个体群,且个体间相互吸引,其聚集度随着种群密度的增大而增加;当m<4.01时,其聚集原因与环境因素有关,当m>4.01时,虫瘿聚集可能是由龙眼叶瘿蚊本身与环境的异质两因素共同作用引起;龙眼叶瘿蚊虫瘿密度在植株的东、南、中、西、北5个方位无显著异;植株中部及下部的虫瘿密度显著高于上部;在以上研究的基础上,根据Iwao最适抽样公式得出了理论抽样模型:N=t2/D2(3.688 4/m+0.197 2),并计算出允许误差范围内,不同虫口密度下的最适理论抽样数。Spatial distribution of galls induced by longan leaf-gall midge（Asphondylia sp.） on Dimocarpus longan Lour.was studied.Data were analyzed by means of 6 aggregation indices,Iwao equation and Talylor′s power-law.In addition,the sampling and factors considered are also discussed in this paper.The results showed that（1） The galls mainly distributed in primary lateral veins or midveins on the lower leaf surface;frequency of the gall appearances was similar on either side of the midveins;the gall distribution ratio was highest in the middle section,followed by the upper and the lower section on a longan leaf with the galls on midveins mainly located at the upper parts,while on lateral veins the middle section.（2） All indices indicated that the gall spatial distribution was an aggregated pattern;the basic component was the individual colonies,which mutually attracted one another with an aggregation intensity increasing with density.（3） The aggregation was caused by the environmental factors when m〈4.01,and by the gall＇s behavior as well as the environmental heterogeneity when m〉4.01.（4） The gall density was not significantly affected by the facing direction on a tree.It was significantly higher on the middle and lower parts of a tree than the upper part.（5） On the basis of the spatial pattern analysis and Iwao′s m＊-m regression formulation,the optimal sampling model was established to be N=t^2/D^2（3.688 4/m＋0.197 2）,and the theoretical optimum sampling numbers for different gall densities within the allowable error were calculated.

关 键 词：龙眼叶瘿蚊 虫瘿 空间分布型 理论抽样数 

分 类 号：Q968.1[生物学—昆虫学]