中文摘要：

在2011年,以元阳梯田2个地方水稻品种白脚老粳和月亮谷为研究对象,以自然光照和大田水稻原位种植为条件,进行模拟臭氧衰减（0、10%、20%、30%）导致UV-B辐射增强（0、2.5、5.0、7.5kJ·m^-2）,研究2个地方水稻品种的N含量和累积量以及稻田土壤有效态N和全N含量对UV-B辐射增强的响应。结果表明：总体上UV-B辐射增强在TR7.5（UV-B辐射增强7.5kJ·m^-2）处理时显著降低2个水稻品种叶、茎、根和穗生物量,在TR7.5处理时,水稻各部位生物量降到最小值。2个地方水稻品种叶、茎、根和穗N含量影响基本一致,显著增加2个地方水稻品种各部位N含量。随着UV-B辐射增强白脚老粳各部位群体累积量有显著增加的趋势,而月亮谷各部位群体累积量随UV-B辐射增强表现出先升后降。UV-B辐射增强促进两个水稻品种N营养输出,降低土壤碱解N和总N含量,导致土壤N库储量降低。

英文摘要：

In 2011, field experiments were conducted to understand the effects of enhanced UV-B radiation（2.5 kJ·m^-2, 5.0 kJ·m^-2and 7.5 kJ·m^-2）on available N and total N in paddy soil, contents and accumulation of nitrogen of traditional rice colonies-Baijiaolaojing （BJLJ）and Yuelianggu（YLG）in Yuanyang terraces. The results showed that：under enhanced UV-B radiation condition, the biomass of leaves, stems, roots and spikes of two traditional rice colonics decreased significantly, especially the lowest biomass under TR 7.5 treatment. The contents of N in each part of two traditional rice colonics increased significantly. The accumulation of N in BJLJ increased significantly. The accumulation of N in YLG increased firstly with the greatest accumulation under TR 5.0 treatment, and then decreased under TR 7.5 treatment. In summary, the contents of soil available and total N contents under enhanced UV-B radiation decreased and the output of N from paddy soil of two traditional rice colonics increased, comparing with decrease in storage of N in paddy soil.