长期不同施肥对玉米田间杂草生物多样性的影响

The Effects of Long-term Different Fertilization on the Biodiversit y of Weeds in Maize Field

通过田间小区试验,研究了长期不同施肥对田间杂草总密度、优势杂草组成及生物多样性的影响。结果表明:综合施用N、P、K肥,不仅降低了田间杂草的总密度,降低了优势杂草在群落中的比重,而且有利于维持田间杂草的生物多样性;不施用N或P肥,田间杂草的总密度增大,优势杂草的比重也明显增强,但不利于维持田间杂草的生物多样性。所以,平衡施用N、P、K肥,有利于维持农田生态系统中的生物多样性,并能更好地进行杂草控制。

Plot trial was carried to study the effects of long-term differen t fertilization on total weed density, dominant weed species and weed biodiversity . The results showed that total weed density was low, dominant weed species were less important and the weed biodiversity was high in the plots received balance d N, P and K nutrients. However, in the plots received no P or N nutrient, the r esults were opposite.So balanced supplies of nutrients are critical for maintain ing biodiversity of weed species in the agro-ecosystem and controlling the infes tation of weeds