Research On Introducing And Cultivation Of Canadian Sugar Maple

This paper studied on the sugar maple from Ontario, Canada. Conducted seedlingtests, observed seedling phenological period, growth and photosynthetic physiologicaltesting and cultivation process autumn leaf inclusions change research in Shucheng county,Anhui province. Based on the comparative analyses of growth rhythm, diurnal variation ofphotosynthesis and autumn leaf color changing characteristics, the paper researched theecological adaptability to new environment of annual seedlings and Biennial seedlings ofCanadian sugar maple to provide a theoretical basis for the application of the Canadianmaple in Anhui. The main results were as follows:1. The seedling experiment showed that Canadian sugar maple seeds have20days ofthe average germination period when sowing in the mid March after cold stratificationtreatment. The leave was unfolded in10days after emergence. From late June to late Sep-tember was the fast-growing period of Annual seedlings, and mid May to early Octoberwas the fast-growing period of biennial seedling. The leave turned to red in the late Octo-ber. Defoliation was about in the mid November. The best leaf color viewing time wasabout early November. Phonological characteristics of annual seedlings and biennialseedlings were consistent. During the seedling growth process, plant height and grounddiameter growth rhythm is similar, vigorous growth period of diameter will come10dayslater than plant height.2. Sugar maple seedlings have strong adaptability in cultivation. The leave werebrowned, curling and dry phenomenon at38℃high temperature environmental conditionsin summers. Some of the leave emerged leaf blight and leaf spot in the7-8month. Therewas no pests application during the two years of seedling growth. Spray chlorothalonil be-fore the leaf blight and leaf spot disease, Spray the thiophanate-methyl and other measurescan alleviate the symptom after symptoms appear.3. Diurnal variation of photosynthesis research showed the follow results. In spring,summer and autumn, the diurnal variation of net photosynthetic rate of the Canadian sugarmaple were bimodal curve type, and had "midday depression" phenomenon. Comparisonof the diurnal variation of net photosynthetic rate and transpiration rate of three seasons ofCanadian sugar maple, the diurnal variation of water useing efficiency bimodal curve typein the spring, summer and autumn, and the autumn day average water use efficiency washigher than the spring and summer. Different season’s physiological and ecological factors affecting net photosynthetic rate were differences. The main impact of Canadian sugarmaple net photosynthetic rate was active radiation and stomata conductance from the over-all situation.4. Canadian sugar maple seedling leaf color changed from green to red in late Octoberevery year. Discoloration of chlorophyll, carotenoids, anthocyanins, soluble sugar contentanalysis showed that: October7to November16, in the Canadian sugar maple leaves, thechlorophyll content overall trended downward, chlorophyll a, chlorophyll b and caroteno-ids trended consistent with the trend of the total chlorophyll, while the leaves of the antho-cyanin content was significantly increased. The PAL activity and soluble sugar contentshowed a significant positive correlation with anthocyanin content in Canadian sugarmaple leaves, indicating that the increasing of the PAL activity and soluble sugar content inleaves in favor of anthocyanin synthesis.