摘要
运用地统计学的方法,根据2002年12月东海区121个站位的资源监测调查数据,拟合变异函数最优模型,计算各向同性下的模型参数和不同方向上的分维数,分析了冬季东海北部和南部太平洋褶柔鱼的空间异质性特征,并进一步探讨了其空间格局与环境的关系。结果表明,在各向同性条件下,东海北部和南部具有相似的空间异质性特征,其变异函数均能用球状模型拟合,呈聚集空间格局,空间变程大约为440 km,随机性因素占空间异质性的30%左右,结构性因素占空间异质性的70%左右,处于主导地位。各向异性分析表明,在东海北部,135°和90°方向的分维数最高,分别为1.954和1.893,说明太平洋褶柔鱼在这两个方向上分布较均匀,空间依赖性较小,这与东南-西北方向的黄海暖流和西-东方向的长江冲淡水一致;而在东海南部,45°方向的分维数最高,为1.999,太平洋褶柔鱼在此方向分布上的同质性与西南-东北方向的黑潮主干及台湾暖流相对应。这说明,海流是影响较大尺度生态过程上太平洋褶柔鱼分布的主要环境要素。
Based on the resources monitoring survey data of December 2002 at 121 sites of East China Sea, and by using the theory of geostatistics, this paper simulated the models of semivariograms for the density distribution of Todarodes pacificus, with semivariogram parameters and fractal dimension calculated, and the relationships between spatial pattern and environment studied, The results showed that under isotropic condition, the spatial heterogeneity of T. pacificus in northern and southern East China Sea was quite similar, and its semivariogram could be described by spherical model, The spatial pattern was aggregative, there was a strongly spatial dependence on higher proportion of spatially structured variance（70 % ）and a smaller random variance（ 30 % ）to total variance, and the range of autocorrelation extended to about 440 km. The anisotropic fractal dimension results indicated that the highest value in the direction of 135° （1,954） and 90° （1.893） of northern East China Sea was coincident with that of west-northward Yellow Sea warm current and eastward Changjiang River diluted water, respectively, The fractal dimension in the direction of 45°of southern East China Sea was close to 2, indicating that T, pacificus distributed evenly in the direction corresponding with east-northward Kuroshio and Taiwan warm current, It was suggested that current was the main environmental factor affecting the distribution of T, pacificus.
出处
《生态学杂志》
CAS
CSCD
北大核心
2005年第11期1299-1302,共4页
Chinese Journal of Ecology
基金
国家科技部公益性基础研究资助项目(2002-2003)
关键词
太平洋褶柔鱼
空间异质性
变异函数
Todarodes pacificus Steenstrup, spatial heterogeneity, semivariogram
