Ecophysiological Variation In Two Elevation Gradient Sources Of Larix Principis-rupprechtii And Picea Asperata Seedlings Across An Elevation Gradient

The guandi mountain pangquan ditch nature reserve of the two elevation gradient (1650m and 2360m) on seedling transplanting experiment was carried out, by measuring the photosynthetic physiological, chlorophyll fluorescence characteristics, chlorophyll contents, leaf nutrient utilization ability and morphology characteristics of Larix principis-rupprechtii and Picea asperata seedlings after transplantation, reaction the elevation gradient on the adaptability of existing plants and its ability to respond to future climate change and adaptation. The results showed that:1) Elevation gradient transplant is a method study of the relationship between climate warming and plant physiological, but this kind of method is half control, moisture conditions, factors such as light, will also affect the results.2) Form high altitude of the Larix principis-rupprechtii seedlings is better than low altitude sources of seedlings in photosynthesis, chlorophyll a content, carotenoid content and morphology characteristics, under the condition of future climate change, the source of high altitude seedlings could be stronger than the source of low altitude seedlings. In experiment zone, along the elevation gradient, the morphology characteristics of larix pricipis-rupprechtii have less change, regulating the physiological activity to adapt the environment changes, a certain amount of warming to the physiological activities of the Larix principis-rupprechtii is beneficial, under the condition of future climate change, Larix principis-rupprechtii area will expand, have trend of movement to the high altitude.3) Elevation source significantly affected the Picea asperata seedlings of water use efficiency, the maximum net photosynthetic rate, quantum yield, leaf nitrogen content, leaf carbon and nitrogen ratio, the source of high altitude seedlings have better nitrogen utilization ability and photosynthetic rates than low altitude sources of seedlings. Picea asperata in the experiment area is not sensitive to the variation of environmental factors, regulating the physiological activity to adapt the environment changes, such as soluble sugar content and non-structural carbohydrates content.4) Larix principis-rupprechtii and Picea asperata seedlings have similar characters response to elevation gradient transplant, they are all regulating the physiological activity to adapt the environment changes, but the Picea asperata seedlings is less sensitive than Larix principis-rupprechtii...