作　　者： ; ; ; (王茹）;

机构地区： 中国农业大学资源与环境学院土地资源管理系

出　　处： 《生态学报》 2003年第11期2210-2218,共9页

摘　　要： 通过 GPS定位采取土样 ,标准方法的土样化验、借助 GIS技术 ,应用 Kriging插值方法 ,分析研究了城乡交错带土壤肥力水平变化及其空间分布。研究结果表明 ,由于近 2 0 a土地集约化利用和采用秸秆还田等土壤培肥技术 ,土壤有机质、全氮、碱解氮和速效磷含量都增加了 ,而速效钾含量因为作物产量增加而施用钾肥不足 ,含量却下降了。各肥力因素情况如下 :1 982年土壤有机质含量及其空间分布情况是 :6～ 1 0g/kg之间的 ,占总面积的 61 .2 3% ;1 0～ 1 2 g/kg之间的 ,占总面积的 35 .1 7% ;1 2～ 1 5 g/kg,占总面积的3.6% ;2 0 0 0年土壤有机质含量及其空间分布情况是 :6～ 1 0 g/kg之间的 ,占总面积的 1 4.35 % ;1 0～ 1 2g/kg之间的 ,占总面积的 33% ;1 2～ 1 5 g/kg之间的 ,占总面积的 32 .43% ;1 5～ 2 0 g/kg之间的 ,占总面积的 1 2 .91 % ;2 0 g/kg以上 ,占总面积的 7.31 %。 1 982年土壤全氮含量及其空间分布情况是 :小于 0 .5 g/kg的 ,占总面积的 2 8.72 % ;0 .5～ 0 .8g/kg的 ,占总面积的 60 .81 % ;2 0 0 0年土壤全氮含量及其空间分布情况是 ,在 0 .8～ 1 .0 g/kg之间的 ,占总面积的 48.5 7% ;含量在 1 .0～ 1 .2 g/kg之间的 ,占总面积的 2 8.87% ;含量在 0 .5～ 0 .8g/kg之间的 ,占总面积的 2 0 . Daxing County, located south of the city of Beijing, was taken as a case study for illustrating soil fertility change. The 1∶50,000 soil map produced in the Second National Soil Survey (SNSS) in 1982 was digitized with GIS supporting. Top soil samples were collected from the same soil sampling sites of the 1∶50,000 soil map with GPS reference locations, from May to June 2000. Three samples collected around each sampling point were mixed and a quarter of each sample was kept for laboratory analysis. At the same time, farmers were interviewed for fertilizer input, irrigation, yield, land management, etc. The soil samples were air dried and ground to pass sieves with 0 15 to 1 mm in diameter in the laboratory. Chemical properties of soils were analyzed using standard methods. The spatial temporal change of soil fertility was studied using the Kriging interpolation method with GPS and GIS supporting. The soil nutrient content classification was based on the SNSS standards. Selected soil fertility factors in the years of 1982 and 2000 are as follows: The organic matter content: the following three categories, 6 to10, 10 to 12 and 12 to 15 g/kg covered 61 23, 35 17, and 3 60% of the total area, respectively, in 1982. The above three categories covered 14 35, 33 00, 32 43% of the total area, respectively, in 2000. In addition, two additional categories, 15 to 20, and 20+ g/kg covered 12 91 and 7 31% of the total area in 2000. For the total nitrogen content: 28 72% of the total area was less than 0 5 g/kg and 60 81% was in the range of 0 5 to 0 8 g/kg in 1982 20 67% of the total area was in the range of 0 8 to 1 0 g/kg, 48 57% in the range of 0 8 to 1 0 g/kg, and 28 87% in the range of 1 0 to 1 2 g/kg, in 2000. The available nitrogen content: the following three categories, 30 to 45, 45 to 60, and 60 to 75 mg/kg covered 26 35, 44 11, and 28 89% of the total area, respectively, in 1982. Two categories, 60 to 75, and 75 to 90 mg/kg covered 57 08 and 33 4% of the total

关 键 词： 土壤养分 时间空间变化 城乡交错带

领　　域： [农业科学]