基于地统计学的柠条豆象种群空间格局研究

目的]研究柠条豆象卵块及幼虫种群的空间分布格局和空间相关性。方法]应用地统计学原理和方法调查柠条豆象卵和幼虫数量,并对所得数据进行分析。结果]柠条豆象卵块和幼虫种群最优拟合模型为圆形模型,空间分布格局均为聚集分布,存在空间相关性,变程范围分别为18.899~62.922和13.464~47.455。采用普通Kriging插值法对柠条豆象卵块与幼虫种群分布进行模拟,显示其分布均具有明显的聚集团块,斑块核心区聚集强度明显高于边缘,且具各向异性,西南至东北方向聚集强度高于东南至西北方向。结论]柠条豆象卵块和幼虫种群空间分布格局均为聚集分布,增加柠条林中柠条的株距和斑块破碎化对柠条豆象的种群发生有一定的控制作用。

Geostatistics Analysis of Spatial Patterns of Kytorhinus immixtus Population

Objective] The paper was to study the spatial distribution pattern and spatial correlation of egg masses and larvae population of Kytorhinus immixtus.Method] By using statistical principles and methods,the quantity of eggs and larvae population of K.immixtus was investigated,and the obtained data were analyzed.Result]The circular model was the best fitting model for egg masses and larvae population of K.immixtus,and the spatial distribution pattern was aggregated distribution with a？spatial correlation,the range of spatial dependence varied from 18.899 to 62.922 and 13.464 to 47.455.The distribution pattern of egg masses and larvae population of Kytorhinus immixtus were simulated by using ordinary Kriging method,and the result showed that their distribution had obvious aggregated character,the aggregation intensity in the core area of plaque was significantly higher than that in the edge.There was anisotropy of aggregation intensity,the aggregation intensity from northeast to southwest direction was significantly higher than that from northwest to southeast direction.Conclusion] The spatial distribution pattern of egg masses and larvae population of K.immixtus was aggregated distribution,and the increase of plant distance and patch fragmentation had a certain control effect on the occurrence of K.immixtus population.