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运用ArcGIS地统计分析方法,对广东省翁源县农业土壤速效钾时空分布特征及其影响因素进行了研究。翁源县1984年土壤速效钾含量变化范围为3.85～235.00 mg.kg-1,大部分地区农业土壤速效钾含量处于四级水平(50～100mg.kg-1),北部地区高于南部地区;2011年全县农业土壤速效钾含量变化范围为4.20～111.00mg.kg-1,大部分地区处于六级水平(小于30mg.kg-1),速效钾缺乏状况严重,分布呈斑块状。研究结果表明,近30年来翁源县农业土壤速效钾含量呈下降趋势,翁西地区下降速率快于东部地区。土壤类型、地形地貌、土地利用方式、施肥管理等因素对农业土壤速效钾含量均有影响。
By using ArcGIS statistical analysis method, the temporal and spatial distribution of available potassium in agricultural soils in Wengyuan County, Guangdong Province and its influencing factors were studied. In 1984, the available potassium content in Wenyuan County ranged from 3.85 mg / kg to 235.00 mg.kg-1. The available potassium in agricultural soils in most areas was in the fourth level (50-100 mg.kg-1), while the northern area was higher than the southern area. In 2011, the range of available potassium in agricultural soils varied from 4.20 to 111.00 mg.kg-1 in most areas, while the majority of areas were at the sixth level (less than 30 mg.kg-1). The available-potassium deficiency was serious and the distribution was patchy. The results show that in the past 30 years, the available potassium content of agricultural soils in Wengyuan County has been declining, and that in Wengxi has been declining faster than that in the eastern regions. Soil types, topography, land use patterns, fertilization management and other factors have an impact on available soil available potassium.