高寒沙地不同林龄乌柳的水分生理特性及叶性状

应用生态学报 ›› 2012, Vol. 23 ›› Issue (09): 2370-2376.

高寒沙地不同林龄乌柳的水分生理特性及叶性状

刘海涛^1,2,贾志清^1,2**,朱雅娟^1，2,于洋^1，2,李清雪^1,2

(¹中国林业科学研究院荒漠化研究所, 北京 100091; ²青海共和荒漠生态系统定位观测研究站, 青海共和 813000)

出版日期:2012-09-18 发布日期:2012-09-18

Water physiological characteristics and leaf traits of different aged Salix cheilophila on alpine sandy land.

LIU Hai-tao^1,2, JIA Zhi-qing^1,2，ZHU Ya-juan^1,.2, YU Yang^1,2, LI Qing-xue^1,2

(¹Institute of Desertification Studies, Chinese Academy of Forestry, Beijing 100091, China; ²Qinghai Gonghe Desert Ecosystem Research Station, Gonghe 813000, Qinghai, China).

Online:2012-09-18 Published:2012-09-18

摘要/Abstract

摘要： 对青海共和盆地4个林龄乌柳的水分生理特征及叶性状参数进行了对比分析.结果表明: 不同林龄乌柳的相对水分亏损无显著差异.37年生乌柳的水势日均值显著低于其他3个林龄,4和11年生乌柳的水势日均值显著低于25年生乌柳.4年生乌柳的失水率显著低于其他3个林龄,25年生乌柳的失水率显著低于11年生乌柳.4年生乌柳比叶面积(SLA)显著低于其他3个林龄,其水分利用效率较高.11年生乌柳单位质量叶氮(N_mass)显著高于其他3个林龄,25年生乌柳N_mass显著高于37年生乌柳,11和25年生乌柳的光合能力较强.11年生乌柳单位质量叶磷(P_mass)显著高于25和37年生乌柳,4年生乌柳P_mass显著高于25年生乌柳.各林龄乌柳的N_mass/P_mass为5.16～6.28,其中25年生乌柳N_mass/P_mass显著高于4和11年生乌柳.4个林龄乌柳N_mass与P_mass呈显著正相关,P_mass与N_mass/P_mass和林龄呈极显著负相关,N_mass/P_mass与林龄呈显著正相关.不同生长阶段乌柳的生态适应对策不同.

Abstract: Taking 4-, 11-, 25-, and 37- year old Salix cheilophila stands on the alpine sandy land of Gonghe basin in Qinghai of West China as test objects, a laboratory test was conducted on their relative water deficit, water holding ability, specific leaf area (SLA), leaf massbased nitrogen concentration (N_mass) and phosphorous concentration (P_mass), and N_mass/P_mass, aimed to understand the variation patterns of the water physiological characteristics and leaf traits of different aged S. cheilophila on alpine sandy land. No significant difference was observed in the relative water deficit of the four stands. The daily mean value of water potential of the 37-year old stand was significantly lower, as compared with that of the other three stands, and the 4- and 11-year old stands had a significantly lower daily mean water potential than the 25-year old stand. The water loss rate of the 4-year old stand was significantly lower than that of the other three stands, and the 25-year old S. cheilophila stand had a significantly lower water loss rate than the 11-year old stand. The 4year old stand also had a significantly lower SLA than the other three stands, implying its higher water use efficiency. The N_mass of the 11-year old stand was significantly higher than that of the other three stands, and the 25-year old stand had a significantly higher N_mass than the 37-year old stand, implying that the 11 and 25-year old stands had a higher photosynthetic capacity. The P_mass of the 11-year old stand was significantly higher than that of the 25- and 37-year old stands, and the 4-year old stand had a significantly higher P_mass than the 25-year old stand. The N_mass/P_mass of the four stands was 5.16-6.28, and the 25-year old stand had a significantly higher N_mass/P_mass than the 4- and 11-year old stands. The N_mass of the four stands was significantly positively correlated with P_mass, the P_mass was highly significantly negatively correlated with N_mass/P_mass and significantly negatively correlated with stand age, and the N_mass/P_mass was significantly positively correlated with stand age. It was suggested that S. cheilophila at its different developmental stages could have different ecological adaptive strategies.

刘海涛1,2,贾志清1,2**,朱雅娟1，2,于洋1，2,李清雪1,2. 高寒沙地不同林龄乌柳的水分生理特性及叶性状[J]. 应用生态学报, 2012, 23(09): 2370-2376.

LIU Hai-tao1,2, JIA Zhi-qing1,2，ZHU Ya-juan1,.2, YU Yang1,2, LI Qing-xue1,2. Water physiological characteristics and leaf traits of different aged Salix cheilophila on alpine sandy land.[J]. Chinese Journal of Applied Ecology, 2012, 23(09): 2370-2376.