中文摘要：

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．

英文摘要：

A simulation experiment with supplementation and exclusion of solar uhraviolet-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 num- ber, and lO0-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 alloca- tion to fruit and lO0-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.