滇西北玉龙雪山急尖长苞冷杉不同海拔的生理特性变化

Physiological Characteristics of Abies georgei var. smithii at Different Altitudes in Yulong Snow Mountain

对丽江玉龙雪山自然保护区内不同海拔（3 100、3 250、3 400、3 550、3 700 m）梯度急尖长苞冷杉（Abies georgei var.smithii）部分生理生化指标的变化进行研究。结果表明：急尖长苞冷杉分布于海拔3 100-3 800 m,不同海拔种群抗氧化酶APX活性及可溶性蛋白含量均随海拔的升高而增加;叶绿素含量及抗氧化酶SOD、CAT活性在海拔3 100-3 550 m条件下并无显著变化,而当海拔上升到3 700 m时,MDA含量、抗氧化酶SOD、CAT、APX活性以及游离脯胺酸含量、可溶性蛋白含量及可溶性糖含量都显著高于其他海拔;此外,在海拔3 550 m环境下,急尖长苞冷杉叶片MDA含量、游离脯胺酸含量及可溶性糖含量都处于最低水平;海拔3 550 m环境因子最适宜于急尖长苞冷杉的生长,而较低海拔或较高海拔环境均不利于该植物的生长;当海拔上升到3 700 m时,植物体内抗氧化酶系统和渗透调节系统能力显著增强,以应对高海拔的逆境胁迫。

Determinations were conducted some to physiological and biochemical index of Abies georgei var. smithii at different altitudes（3100m,3250 m,3400m,3550 m,3700m） of Yulong Snow Mountain in Yunnan province. The results showed that both the activities of ascorbate peroxidase（APO） and the content of soluble protein in leaves of A. georgei var. smithii from different altitudes increased obviously with the increase of altitude. The content of chlorophyll and the activities of SOD, CAT had no evident difference in the leaves from the altitude of 3100- 3550 m, however, MDA content, the activities of anti-oxidases（SOD, CAT, APX）, the free proline and soluble protein and soluble sugar contents in the leaves from altitude of 3700 m were significantly higher than that of others. The content of MDA, soluble sugar and free proline in leaves of A. georgei var. smithii was the lowest at the altitude of 3550 m. The experiment demonstrated that A. georgei var. smithii grows well at altitude of 3550 m.