3种高山植物紫外吸收物质含量随海拔与季节的变化特征  

Characteristics of Seasonal and Altitude Variation of UV-absorbing Compounds Content in Three Alpine Plants on Qinghai-Tibet Plateau

作　　者：彭慧超[1,3] 韩发[1] 王环[2] 师生波[1] 沈建伟[2,3] 周党卫[1] 

机构地区：[1]中国科学院西北高原生物研究所,高原生物适应与进化重点实验室,西宁810001 [2]中国科学院西北高原生物研究所,藏药现代化研究中心,西宁810001 [3]中国科学院研究生院,北京100093

出　　处：《西北植物学报》2010年第6期1197-1203,共7页Acta Botanica Boreali-Occidentalia Sinica

基　　金：中科院知识创新项目(KSCX2-SW-106);中科院西北高原生物研究所知识创新前沿项目(0954051211,0954061211)

摘　　要：在植物生长季,对生长于不同海拔高度的3种高山植物矮嵩草(Kobresia humilis)、珠芽蓼(Polygonum viviparum)和平车前(Plantago depressa)的紫外吸收物质含量的季节和海拔变化特征进行了比较研究,以揭示高山植物对极端环境适应的生理生态学机制。结果显示:(1)在整个生长季,3种高山植物叶片紫外吸收物质含量在同时期同海拔条件下表现为平车前最低,珠芽蓼最高。随着海拔升高,紫外吸收物质含量在3种植物中均呈现增加趋势,并与海拔高度存在正相关关系。(2)3种高山植物紫外吸收物质含量随季节均呈现单峰变化趋势;矮嵩草和珠芽蓼的紫外吸收物质含量在草盛初期的6月份达到最大值,而后逐渐降低,并且与紫外辐射强度的季节动态存在一定正相关性;平车前紫外吸收物质含量在草盛期的7月份达到最大值,而后含量逐渐降低,其紫外吸收物质含量的季节变化与紫外辐射强度的季节变化呈较低的负相关,而与植物发育时期可能有关。可见,3种高山植物叶片紫外吸收物质含量随海拔与季节变化特征存在差异,这可能与它们的遗传特性和适应高原强紫外辐射环境胁迫策略有关。The content variation of UV-absorbing compounds in Kobresia humilis,Polygonum viviparum and Plantago depressa was studied in growing season at different altitudes in order to insight into their adaptation mechanism to extreme environment at alpine region.The results showed that UV-absorbing compounds content in the leaves of P.viviparum was the highest,K.humilis took the second place,while that was the lowest in P.depressa in the growing season.As the altitudes elevating,the content of UV-absorbing compounds inclined to increase in the three alpine plants and which had the closely positive relationship with the elevation.Seasonal variation of UV-absorbing compounds content in three species appeared only monotonic curve in growing season.However,it showed some differences in three alpine plants.The UV-absorbing compounds content had the highest value at the beginning of the exuberance（in June） in K.humilis and P.viviparum,then it began decreased after that period.Seasonal fluctuation of UV-absorbing compounds in the two species had some positive relationship with the UV-B radiation intensity.While which seemed to fluctuate with its developmental process in P.depressa.It had the highest value in the middle of the exuberance（in July） at different altitudes and inclined to decrease in withering period.The seasonal variation of UV-absorbing compounds content had some negative relationship with the UV-B radiation intensity.Therefore,the differences of seasonal and altitudes variation of UV-absorbing componds among three alpine plants were probably related with the genetics characteristics and adaptation to extremly high UV-B radiation stress in alpine region.

关 键 词：海拔 高山植物 紫外吸收物质 季节动态 

分 类 号：Q948.118[生物学—植物学]