中文摘要：

以一窝红甘薯品种为试验材料,于2009-2012年设置甘薯多年连作（对照,T1）、休闲地-甘薯（T2）、玉米-黑麦-甘薯（T3）、玉米-休闲-甘薯（T4）、（大豆‖豌豆）-休闲-甘薯（T5）、大豆-休闲-甘薯（T6）、大豆-黑麦-甘薯（T7）、豌豆-休闲-甘薯（T8）等8种种植模式处理,研究种植模式对甘薯产量、病情指数及甘薯根际土壤甘薯茎线虫数量的影响。结果表明,与T1相比,不同轮作模式均可以提高甘薯经济产量、降低病情指数,其中T3和T7种植模式显著提高甘薯产量（P〈0.05）,分别提高108.24%和107.29%,T3和T5种植模式显著降低病情指数,分别降低44.51%和35.56%。2个轮作生长季甘薯根际茎线虫数量在甘薯不同生长时期差异显著,2010年数量呈增长趋势、2012年无明显变化趋势,且总体数量较2010年减少;2010年土壤根际甘薯茎线虫数量较低的是T4和T6,2012年是T3和T4。2010年和2012年甘薯产量均与同年7月根际土壤甘薯茎线虫数量呈显著负相关。2轮轮作结果表明玉米-休闲-甘薯处理可显著提高甘薯产量并降低病情,而玉米-黑麦-甘薯可有效抑制甘薯根际茎线虫数量,7月是防治茎线虫、提高产量的关键时期。

英文摘要：

This experiment was conducted to study the effect of cropping patterns on sweet potato yield, disease index and nematodes population in rhizosphere soil. Eight cropping systems, including sweet potato continuous cropping （T1）, fallow- sweet potato （T2）, maize- ryesweet potato （T3）, maize- fallow- sweet potato （T4）, soybean II pea- fallow- sweet potato （T5）, soybean - fallow- sweet potato （T6）, soybean- rye- sweet potato （T7） and pea- fallow- sweet potato （T8） were carded out during 2009-2012. The results showed that compared with the control （T1）, all rotations could increase yield and decrease disease index. The yield of sweet potatoes obviously increased in T3 （107.29%） and T7 （108.24%）. Disease index of sweet potato obviously decreased in T3 （35.56%） and T5 （ 44.51%）. Over the 2-round experiment, the nematodes population in rhizosphere soil in each stage had significant difference （P 〈0.05）, there was a growing trend for the population in 2010, while no trend in 2012, but lower than that of 2010.The lowest of nematodes population in rhizosphere soil were obtained from T4 and T6 in 2010, T3 and T4 in 2012, respectively. There was a significant negative correlation between the sweet potato yield and nematodes population in rhizosphere soil both in July 2010 and 2012. The 2-round rotation results showed that the rotation pattern of maize- fallow-sweet potato significantly increased the yield and decreased disease index, maize-rye-sweet potato could control the population of nematodes effectively, and July was a good timing to control nematodes and promote yield.