【摘要】 采用增补和滤除掉部分自然UV-B辐射的模拟试验,研究了增强和近环境UV-B辐射对高寒草甸一年生牧草窄叶野豌豆生长和繁殖的影响.结果表明:增补UV-B辐射处理后,窄叶野豌豆的株高、生物量、分配向果实的生物量、总花数和种子百粒重均显著下降,花期延迟,开花集中度和繁殖成功率有所提高,而种子产量无显著变化.相对于减弱UV-B辐射处理,近环境UV-B辐射使窄叶野豌豆的株高先降后升,分配向果实的生物量减少,花期、花数和种子产量无显著变化,种子百粒重减小.增强和近环境UV-B辐射对窄叶野豌豆的生长和繁殖有一定的抑制作用,且增强UV-B辐射的影响更大.更多还原

【Abstract】 A simulation experiment with supplementation and exclusion of solar ultraviolet-B(UV-B) radiation was conducted to study the effects of enhanced and near ambient UV-B radiation on the growth and reproduction of alpine annual pasture Vicia angustifolia on Qinghai-Tibet Plateau.Enhanced UV-B decreased the plant height and biomass,biomass allocation to fruit,flower number,and 100-seed mass significantly,delayed flowering stage,increased the concentration degree of flowering and success rate of reproduction,but had little effect on seed yield.Near ambient UV-B radiation made the plant height increased after an initial decrease,decreased biomass allocation to fruit and 100-seed mass,but little affected flowering duration,flower number,and seed yield.Both enhanced and near ambient UV-B radiation could inhibit the growth and production of V.angustifolia,and the effect of enhanced UV-B radiation was even larger.更多还原