关键词: 主成分分析, 主成分分析

Abstract:

In order to select the fine varieties of Gingkgo biloba L. which adapted to be cultivated in Longnan District, explore the rules of growth habit on different varieties, and afford the theoretical guides to cultivation techniques on Gingkgo biloba L. for leaf use and fruity use. The author made an introduction trial on the four species, Qixingguo, Dafoshou, No.6 Yuanling, and Damaling which came from Taizhou City, Jiangsu Province and took the observation and investigation on the one-year-old grafting sapling about the following indexes of the survival rate, the types of branches for shading, the growth of fresh branches, phenophase, and the net photosynthetic rate. With the SPSS 17.0 software to take the variance analysis, the results were as follows: (1) the grafting survival rate was Damaling>Dafoshou>Qixingguo>No. 6 Yuanling, and the rate was all higher than 73.36%; (2) Compared to the local specie of Dafozhi, the top-cutting time of four introduction species had delayed one or three days. Except for that, there were no significant differences on the budding, leaf-expansion, leaf-golden and deciduous periods; (3) The number of long branches for shading and the growth of fresh branches on No. 6 Yuanling was significantly higher than Dafozhi. The number of short-branches on Damaling was higher than other species, and the growth of fresh branches was higher Dafozhi; (4) The changing tendency of photosynthetic rate on Dafoshou, Qixingguo and No. 6 Yuanling was obviously showed the double-peak curves. But the changing tendency of photosynthetic rate on Dafozhi was just showed single-peak curve at 10:00, and the photosynthetic rate on Dafozhi was significantly lower than other species at the time of 8:00, 12:00, 14:00 and 16:00.