ABSTRACT

In this study, we conducted a field experiment to investigate the effect of reduced chemical fertilizer and combined application of organic materials on nematode community in a wheat-maize cropping system over two crop seasons (wheat and maize). The results showed that the soil moisture emerged as the major determinant of nematode community structure in wheat season, while the soil pH was the main factor influencing the nematode variation in maize season. The effect of soil properties accounted for 2.4% of the total variation in nematode community. The Shannon index in the straw addition treatment significantly increased by 38.5% in comparison with the NPK treatment in wheat season. The ecological network showed that organic fertilizer simplified the complexity of the ecological network of straw treatment and the separate return of straw suppressed the efficiency of material circulation, energy flow, and information transmission among nematode network species. These results indicate that reduced chemical fertilizer and combined application of organic materials made the nematode community structure more stable and improved the sustainability of agroecosystems.

摘要

在这项研究中，我们进行了田间试验，以研究减少化肥和有机材料联合施用对两个作物季节（小麦和玉米）小麦-玉米种植系统中线虫群落的影响。结果表明，小麦季土壤水分是线虫群落结构的主要决定因素，而玉米季土壤pH值是影响线虫变异的主要因素。土壤性质的影响占线虫群落总变异的2.4%。麦季秸秆添加处理香农指数较NPK处理显着提高38.5%。生态网络表明，有机肥简化了秸秆处理生态网络的复杂性，秸秆的单独还田抑制了线虫网络物种间物质循环、能量流动和信息传递的效率。这些结果表明，减少化肥和有机物质的组合施用使线虫群落结构更加稳定，提高了农业生态系统的可持续性。