关键词：
水分生理特性;叶性状;乌柳;林龄;共和盆地
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(Nmass)显著高于其他3个林龄,25年生乌柳Nmass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(Pmass)显著高于25和37年生乌柳,4年生乌柳Pmass显著高于25年生乌柳.各林龄乌柳的Nmass/Pmass为5.16～6.28,其中25年生乌柳Nmass/Pmass显著高于4和11年生乌柳.4个林龄乌柳Nmass与Pmass呈显著正相关,Pmass与Nmass/Pmass和林龄呈极显著负相关,Nmass/Pmass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.
译 名：
Water physiological characteristics and leaf traits of different aged Salix cheilophila on alpine sandy land
作 者：
LIU Hai-tao1,2,JIA Zhi-qing1,2,ZHU Ya-juan1,.2,YU Yang1,2,LI Qing-xue1,2(1Institute of Desertification Studies,Chinese Academy of Forestry,Beijing 100091,China;2 Qinghai Gonghe Desert Ecosystem Research Station,Gonghe 813000,Qinghai,China).
关键词：
water physiological characteristics;leaf trait;Salix cheilophila;stand age;Gonghe basin.
摘 要：
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(Nmass) and phosphorous concentration(Pmass),and Nmass/Pmass,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 Nmass 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 Nmass than the 37-year old stand,implying that the 11-and 25-year old stands had a higher photosynthetic capacity.The Pmass 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 Pmass than the 25-year old stand.The Nmass/Pmass of the four stands was 5.16-6.28,and the 25-year old stand had a significantly higher Nmass/Pmass than the 4-and 11-year old stands.The Nmass of the four stands was significantly positively correlated with Pmass,the Pmass was highly significantly negatively correlated with Nmass/Pmass and significantly negatively correlated with stand age,and the Nmass/Pmass was significantly positively correlated with stand age.It was suggested that S.cheilophila at its different developmental stages could have different ecological adaptive strategies.
