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为探讨稻水象甲幼虫在贵州高原山地环境下空间分布结构,应用6种聚集度指标法和2种回归模型法,研究了旱育秧和两段式育秧方式对其空间分布型的影响。2种育秧方式稻田中稻水象甲幼虫均呈密度依赖性负二项聚集分布,基本成分是个体群,个体间相互吸引。旱育秧稻田稻水象甲幼虫聚集的原因是由环境因素所致,而两段式育秧稻田幼虫聚集的原因是由环境因素与昆虫本身聚集习性共同引发。当防治阈值为12头/丛、置信水平为1.96时,旱育秧稻田幼虫序贯抽样公式为:T1(n),T0(n)=12n±15.2943槡n;两段式育秧稻田为T1(n),T0(n)=12n±17.7580槡n,两类稻田中百丛虫量分别达到1353头和1378头以上时需要进行防治。旱育秧稻田稻水象甲幼虫最适宜的抽样方法为平行线取样法,而两段式育秧稻田则为棋盘式取样法。
In order to explore the spatial distribution of rice water weevil larvae in the mountainous plateau of Guizhou Plateau, six kinds of aggregation indices and two regression models were used to study the effects of drought-tolerant transplanting and two-stage transplanting methods on their spatial distribution. The two kinds of rice seedlings were both negatively binomial and density-dependent, with the basic components being individual groups and individuals attracting each other. The reason for the accumulation of water elephant larvae in dry-raised rice fields is due to environmental factors, and the reason for the accumulation of larvae in two-stage raised rice fields is due to the aggregation of environmental factors and insects themselves. When the control threshold was 12 plexus and the confidence level was 1.96, the sequential sampling formula of larvae in paddy field with drought-resistance was T1 (n) and T0 (n) = 12n ± 15.2943 槡 n. The two- ), T0 (n) = 12n ± 17.7580 槡 n, the amount of hundred insects in both types of rice fields reached 1353 and 1378 or more, respectively. The most suitable sampling method for water-weevil larvae in dry-raising rice fields is the parallel sampling method, while the two-stage breeding rice fields are in the checkerboard sampling method.