广东省翁源县农业土壤速效钾时空变异特征及其影响因素研究

The Temporal-spatial Variation of Available K in Agricultural Soils and Its Influencing Factors in Wengyuan,Guangdong

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。

With ArcGIS geostatistical analysis methods the spatial and temporal distribution characteristics of soil available K as well as its influencing factors of typical regions in Wengyuan, an agricultural area in Wengjiang fiver basin, were studied. The results are as follows： The variation range of soil available K was from 3.85 to 235. 00 mg·kg-1 in 1984. In most areas, the level of soil available K content ranked fourth （50 - 100 mg·kg-1 ）according to soil nutrient content grading standards. The content of soil available K in the northern areas was higher than that in the southern areas. In 2011, the level of soil available K content of most areas ranked sixth （30 mg ·kg-1） , which showed that available K deficiency was very serious. From 1984 to 2011, the soils in the western areas showed a rapid decrease in available K. Accordingly, soil available K content in the eastern and southern areas decreased slightly. In conclusion, the soils available K in Wengyuan decreased. The influencing factors such as landform, soil type, land use and cover change, the amount of chemical fertilizer and so on were analyzed.