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应用长江下游地区小麦品种区域试验1979—1983年4个小麦生长季的产量、每穗粒数和千粒重资料,分别按其基因型×地点效应的相似性进行聚类分析。6—7个小麦材料种在13个试点。计算各试点间所有可能成对的78个欧氏距离系数。此种分析有助于为选择确当试验地点以研究早期世代和品种适应性的宽窄提供参考。结果表明,本试验中区试地点分类上用对照品种多年多点的千粒重资料为变量,聚类效果较好。按其4年千粒重的距离,13个区试点可分为2片、6区、10组。一、大运河以东片。包括:(一)东部平原,有苏州、南通(如东);(二)沿河低地,有武进、常熟、兴化;(三)沿海砂土区,有盐城、大丰。二、大运河以西片。包括:(四)高砂土地区,有扬州;(五)丘陵区,有镇江、仪征,南京;(六)沿江、沿湖区,有江浦、金湖。最后根据聚类结果,对区试点的调整问题进行了讨论。
According to the similarity of genotype × site effect in the regional wheat yield test, yield per panicle and grain weight per 1000 spike in four wheat growing seasons from 1979 to 1983, the cluster analysis was conducted. 6-7 wheat varieties were planted in 13 pilots. Calculate the 78 Euclidean distance coefficients that may be paired between pilots. Such an analysis helps to provide a reference for choosing the right test site to study the breadth of early generations and variety adaptability. The results showed that in this experiment, the 1000-grain weight data of multi-year and multi-year control varieties in the test area were used as variables, and the clustering effect was better. According to the 4-year 1000-grain weight distance, 13 districts pilot can be divided into 2, 6, 10 groups. First, the east of the Grand Canal. Including: (1) Eastern Plain, with Suzhou and Nantong (eg East); (2) Wujin, Changshu and Xinghua along the lower reaches of the river; and (3) Coastal sandy areas with Yancheng and Dafeng. Second, the Grand Canal to the west. Including: (I) High sandy soil area with Yangzhou; (5) Hilly area with Zhenjiang, Yizheng and Nanjing; (6) Riverside and Lakeshore area with Jiangpu and Jinhu. Finally, based on the clustering results, the adjustment of the district pilot is discussed.