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运用地理信息系统(GIS)和地统计学方法对不同播期苜蓿(Medicago sativa L.)人工草地入侵杂草种群相对多度进行分析,并采用普通克里格(OK)插值法模拟入侵杂草种群空间分布,为有效防止苜蓿草地杂草入侵发生提供依据。结果表明:不同播期处理间,苜蓿苗期入侵杂草种群存在空间相关性,其半变异函数曲线均为指数型,主要呈聚集格局,随着6个设置播期的推迟,聚集程度呈现均匀-聚集-均匀的变化趋势。通过比较不同播期处理杂草种群相对多度的模拟分布,播期Ⅰ和Ⅵ处理有利于控制苗期苜蓿杂草的发生,是兰西地区当年建植苜蓿人工草地的适宜播期。
Geographic Information System (GIS) and geostatistics methods were used to analyze the relative abundance of weedy weeds infested by artificial seasons (Medicago sativa L.) at different sowing dates, and the common kriging (OK) The spatial distribution of population provided the basis for effectively preventing weeds in alfalfa grassland from invading. The results showed that the spatial distribution of weedy populations in alfalfa seedlings at different sowing dates was spatially correlated, and the semivariogram curves were exponential and mainly aggregated. With the six sowing dates delayed, the degree of aggregation was uniform - Aggregation - a trend of evenness. By comparing the simulated distribution of relative abundance of weed population in different sowing dates, the sowing date Ⅰ and Ⅵ treatments were helpful to control the occurrence of alfalfa weeds at the seedling stage, which was the suitable sowing date for planting alfalfa artificial grassland in Lanxi area.