银杏生长相关气象因子的分解及其对种核产量的影响研究

STUDIES ON RESOLUTION OF THE RELATIVE CLIMATIC FACTORS TO GROWTH AND THEIR INFLUENCE UPON THE SEED STONE YIELD IN GINKGO BILOBA

调查银杏主产区泰兴市１９５９～１９９２年间银杏不同生长发育时期的各个气象因子（Ｘｉ）对种核产量（Ｙ）的影响，明确影响银杏种核产量变化的主要气象因子为４月份平均相对湿度（Ｘ２）、５月份总日照时数（Ｘ２２）、６月份最长连续无降雨日数（Ｘ１５）、６月份最低温度（Ｘ３３）、７月份最高温度（Ｘ３０）和最低温度（Ｘ３４），其对Ｙ的直接通径系数分别为－０．２２３５２６、０．２２０４２７、－０．２５６４７８、０．４８８０９３、０．４９６６６６和－０．５０５２２６。

In order to analyse the effects of the climatic factors on the seed stone yield of Maidenhair tree ( Ginkgo biloba L.), it was conducted to investigate the relative climatic factors to growth of Ginkgo biloba in 1959￣1992 in Taixing, the main productive district of Ginkgo biloba for a long enduring, such as raining days, average of relative humidity, amount of precipitation, average temperature, total hours of sunshine, average of maximum wind speed, longest days of continuous no rain, maximum temperature and minimum temperature etc. Then, for Ginkgo biloba, each climatic factor was resolved into the relative variables ( X i ) to the different stages of growth and development. It was appeared from the research results that the main climatic factors affecting the variation of the seed stone yield were average of relative humidity in April ( X 2) , longest days of continuous no rain in June ( X 15 ), total hours of sunshine in May ( X 22 ), maximum temperature in July ( X 30 ) , minimum temperature in June ( X 33 ) and minimum temperature in July ( X 34 ). The direct path coefficients of X 2, X 15 , X 22 , X 30 , X 33 and X 34 to the seed stone yield ( Y ) was -0.223 526, -0.256 478, 0.220 427, 0.496 666, 0.488 094 and -0.505 226, respectively.