应用生态学报2011，Vol.22Issue(1)：53-60,8.
青藏高原强UV-B辐射对美丽风毛菊光合作用和色素含量的影响
Effects of strong solar UV-B radiation on photosynthesis and photosynthetic pigment contents of Saussurea superba on Qinghai-Tibet Plateau
摘要
Abstract
Taking the main companion species Saussurea superba in an alpine Kobresia humilis meadow on Qinghai-Tibet Plateau as test material, a UV-B exclusion experiment with UV-B excluding and UV-B transmitting filters was performed to study the effects of strong solar UV-B on the photosynthesis, photosynthetic pigments, and UV-B-absorbing compounds of S. superba, aimed to examine the adaptation capability of alpine plants to strong solar UV-B radiation. The removal of UV-B components from natural sunlight increased the net photosynthetic rate (P＜0. 05 ) and PS Ⅱ photochemistry efficiency of S. superba. The relatively increased leaf thickness under ambient UV-B could compensate the photo-oxidation of photosynthetic pigments, an inherent characteristic of alpine plants growing in intense UV-B. Short-term removal of UV-B radiation had no obvious effects on the UV-B-absorbing compounds, suggesting that these compounds in epidermal layer of S. superba could hardly be affected by the environment. It was concluded that the increase of photosynthetic pigment contents due to the enhancement of leaf thickness was a specious phenomenon, but the strong solar UV-B radiation on Qinghai-Tibet Plateau still had a potential negative impact on the photo-physiological processes in alpine plant S. superba.关键词
高山植物/光合作用/PSⅡ光化学效率/青藏高原/紫外线吸收物质/UV-B辐射分类
农业科技引用本文复制引用
师生波,尚艳霞,朱鹏锦,张德罡..青藏高原强UV-B辐射对美丽风毛菊光合作用和色素含量的影响[J].应用生态学报,2011,22(1):53-60,8.基金项目
国家自然科学基金项目(30670307,30570270,30170154)和国际科技合作重点项目(2002CB714006)资助. （30670307,30570270,30170154）
