A Preliminary Study on the Relationships between the Main Climatic Ecological Factors and the Physiological Activities and the Growth of Cunninghamia lanceolata (Lamb.) Hook in Its Northernmost Marginal Regions
Abstract:Cunninghamia lanceolata (Lamb.) Hook is a native plant of the moist subtropics in eastern China. In the present paper, the C. lanceolata artifical forests, which were cultivated in the Taiping and Jinzhai counties of Anhui province where were their northernmost marginal regions, were mainly studied on the relations between the climatic ecological factors and the physiological activities and the growth of the annual ring width. The results based on surveying and companing the microclimatic ecological factors including the intensity of light, temperature, relative humidity and wind velocity and the physiological activities of photosynthesis, respiration, transpiration and water potential of leaf tissues showed that the astigamitic light was more effective than the direct light to the growth of C. lanceolata, and the optimum temperature scope of net photosynthesis of C. lanceolata is from 25℃ to 29 ℃ in the Taiping County. According to the analysis of the annual ring width of C. lanceolata regarding the climatic ecological factors by the mono-correlative, polycorrelative and stepwise multiple linear regression, the author is convinced that the relative humidity and percentage of sunshine time during the growth period (from April to October) are the most important factors among the climatic ecological factors affecting the growth of C. lanceolata in the Jinzhai county. So the author suggests that C. lanceolata has some potentiality for development in these regions mentioned above.