摘要
本文通过聚集度指标（如：Ｃ、Ｋ、Ｃ＿Ａ、Ｉ、Ｉ＿δ、）测定，以及Ｉｗａｏ’线性回归、Ｔａｙｌｏｒ’ｓＳ￣２一回归和格局纹理分析，结果表明，棉花烂铃空间格而在一切密度下都呈聚集型，且聚集强度随烂铃密度的升高而增加，其空间格局的基本成分是疏松的个体群，其大小约为２～５株棉花，平均约含２．８４个烂铃个体，且个体群内的个体呈随机分布，经μ检验和方差分析，双对角线５点式、棋盘式和平行跳跃式等３种取样方法均适用于棉花烂铃田间调查，尤以双对角线５点式为佳，用双对角线５点式应样法调查的最适抽样数：一般病情普查至少１０个样方（每样方系５株棉花），系统测报和科研调查为２０～３０个样方。最后给出了棉花烂铃平均密度的零频率简易估计模型。
The spatial patterns of the cotton boll rot were measured by the seven indicesof aggregation intensity(inducing:C, K, C_A, Ⅰ, Ⅰ_δ,and the Iwao's straight line regression and the Taglor' s power regression and the distributional veinin this paper. The result showed the following aspect:(1)The spatial patterns of the cot-ton boll rot is the aggregation pattern under all density,and the aggregation degree raisewith increase of the cotton boll rot density.(2)The basic component of the spatial patternsis a loose colony and the distribution the intra一colony is uniform.(3)The mean size ofcolony is about 2～5 cotton plants and equal to about 2.84 individuals of the cotton bollrot.The results of μ test and variance analysis show that the all methods of sampling(Dou-ble diagonal of five points,scattering and paralled)are suitable for the investigation of thecotton boll rot in cotton fields,and the double diagonal of five points is a best way ofthem. The sample number by the double diagonal of five points might be less than 10squares(it is 5 cotton plants)in the common investigation and 20～30 squares in the sys-tematic forecasting and the scientific investigation. The simple estimate model of the meandensity of cotton boll rot is given at the end of this article.
出处
《棉花学报》
CSCD
北大核心
1996年第5期254-260,共7页
Cotton Science
基金
江苏省"八五"攻关项目
关键词
棉花
烂铃
空间格局
抽样技术
cotton boll rot spatial pattern sampling technique
