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为了明确长期不同施肥模式对中国南方地区稻-稻-闲轮作系统早稻田杂草群落及早稻产量的影响,在28年定位施肥试验田中,调查了稻田杂草密度、地上生物量、冠层光照透过率及早稻产量构成因素,并测定了土壤有效养分、杂草及早稻植株N、P、K含量和吸收量。结果表明:不同施肥模式改变了土壤养分状况,导致了田间杂草群落和早稻产量的显著差异;在同时施用N、P和K肥以及N、P和K肥配施有机肥处理中杂草群落密度较小、物种多样性也较低,但杂草生长良好,地上生物量较高;土壤有效养分的显著增加提高了早稻产量,使早稻获得了更强的竞争力,降低了田间杂草获得的光照,使其生长受到抑制。
In order to clarify the effect of long-term different fertilization modes on the weed community and the early rice yield in the early rice paddy-rice rotation system in southern China, the weed density, aboveground biomass and canopy light intensity Overdrive rate and yield components of early rice, and measured soil available nutrients, weeds and early rice N, P, K content and absorption. The results showed that different fertilization modes changed the soil nutrient status, which led to significant differences in field weed community and early rice yield. In the application of N, P and K fertilizers and N, P and K fertilizers at the same time, Lower density and lower species diversity, but the weeds grew well and the aboveground biomass was higher. The significant increase of soil available nutrients increased the yield of early rice, made the early rice more competitive and reduced the availability of weeds Of the light, so that its growth is inhibited.