中文摘要：

采用大田试验方法,研究了模拟紫外辐射（UV-B,280 nm～310 nm）增强对4个UV-B辐射敏感性不同的割手密无性系根际真菌数量和优势种群的影响。结果表明：UV-B辐射增强不改变割手密根际真菌的数量在分蘖期最大、幼苗期次之、伸长期和成熟期较少的规律性;UV-B辐射增强条件下,割手密耐性无性系根际真菌数量显著增加,并显著多于敏感无性系,但UV-B辐射使割手密无性系根际真菌的优势种群组成减少,优势种群以青霉属真菌为主。

英文摘要：

Field studies were conducted for a season to determine potential for alterations in the rhizosphere fungi quantity dynamics and dominant populations of 4 wild sugarcane clones（S.spontaneum L.） with different UV-B sensitivity under an enhanced ultraviolet-B（UV-B,280 nm～310 nm） radiation.The quantity of rhizosphere fungi was most in tillering stage,second in seedling stage and lest in elongating stage and maturing stage,the sequence wasn’t alternated by UV-B radiation.The rhizosphere fungi quantity of tolerant clone was obviously increased and greater than the sensitive clone under the enhanced UV-B radiation,however,the number of dominant populations decreased and Penicillium was the dominant population during the periods of 4 wild sugarcane clones.