牧草氮素产量的时空变异研究

以英国Hillsborough农业研究所附近的一块7.9hm2的牧草田为研究区,采用地统计方法研究分析连续3年的牧草氮素产量在3个收割季节的空间变异,并研究了第一、二季其空间分布的变异在时间上的稳定性。结果表明,试验区牧草氮素产量在单个田块间存在较大的空间变异,而且这种变异在不同的生长季呈现有规律变化,变量施肥是必要的;牧草氮素产量的空间分布与地形有很大的关系,可以根据地形将试验区分片管理。

Temporal and spatial variability of sward N yield patterns

In this present study, the spatial patterns of N yield in a grass silage field at first, second and third cuts over a three-year period were evaluated, and temporal variability of sward at the first and the second cut were quantified. A 7.9 hectare grassland field close to the Agricultural Research Institute at Hillsborough, Northern Ireland, was selected for the study. Sward N yields were found to vary greatly across the field in different seasons. It was concluded that site-specific management approach to fertilization is necessary. The spatial patterns of N yield in the field are related with the variation altitude. They can be divided into management subunits by the topography.