岷江上游干旱河谷区岷江柏对不同海拔的响应

在岷江上游干旱河谷区通过设置不同海拔梯度,对土壤水分、岷江柏生理生化及生长指标进行了分析,旨在探索干旱河谷区主要造林树种对逆境的响应,为这一地区岷江柏人工林的营造提供理论和技术支撑。研究结果表明：随海拔的升高,岷江柏的光合速率、水分利用率、SOD活性、丙二醛（MDA）含量、可溶性糖含量、脯氨酸含量、苗高和地径年生长量的蒸腾速率、可溶性蛋白含量表现为先升高再下降的趋势;而POD活性和叶绿素含量则是随着海拔的升高呈不断下降的变化趋势。从其生长指标和生理指标来看,岷江柏在海拔2 200 m～2 300 m之间生长最好。因此,在该区营造人工岷江柏林的时候,应该优先选择这一地段。

Effects of Different Altitudes on Growth Condition of Cupressus chengiana in the Arid River Valleys in the Upper Reaches of the Minjiang River

Cupressus chengiana had been cultivated at different altitudes in arid valleys of the Minjiang River for 2 years.The soil moisture,plant physiology,biochemistry and growth were analyzed to explore the response of the main afforestation tree species to adversity in arid valleys and provide theory and technical guidance for the cultivation of Cupressus chengiana plantations in this area.The reseach results were as follows：with the increase of elevation,the photosynthetic rate,water use efficiency,the ativity of SOD,the content of MDA,soluble sugar and proline and the growth increment of Cupressus chengiana decreased firstly and then increased.While the transpiration rate and soluble protein increased firstly and then decreased.And the activity of POD and chlorophyll＇s content decreased with the increase of elevation.The results showd that the most suitable growth area of Cupressus chengiana in arid valleys of the Minjiang River was between 2 200 meter and 2 300 meter.Therefore Cupressus chengiana could widely planted in this area.