【摘要】 综合运用统计学和地理信息技术,以海南省儋州市作为研究区域,对农业用地土壤速效磷、速效钾空间变异进行分析。结果表明:儋州农业用地土壤速效磷平均含量为13.15 mg·kg^-1,总体水平中等,变异系数达163.99%,属强度变异,空间变程约为12.03 km,C0/（C0+C）值为66.68%;速效钾平均含量为36.49 mg·kg^-1,总体水平较低,变异系数为78.02%,属中度变异,空间变程约为12.10 km,C0/（C0+C）值为63.80%。两者均属中等程度的空间相关性,Kriging插值分析得两者在空间上均呈嵌套分布,其中,速效磷变异较大,以3级水平分布范围最广,中北部、中东部较高,其余区域（北部、中部、南部、中西部）逐渐降低;速效钾变异比速效磷稍弱,以5级水平分布范围最广,南部、东部、北部集中呈大块状分布。这种空间分布可能与当地的地表形态、地质状况及土地利用、管理方式等有关。更多还原

【Abstract】 Understanding the spatial variation and distribution pattern of soil available phosphorus（SAP） and soil available potassium（SAK） contents is of great importance for sustainable development of agricultural land in a region.The spatial variation of SAP and SAK contents in agricultural land in Danzhou,Hainan was analyzed by using geostatistics and geographic information system（GIS） to provide information for preventing soil degradation.There were 2 597 soil samples（0-20 cm） collected from the agricultural land.The geostatistical characteristics,spatial trend and range of the SAP and SAK contents were analyzed using the Geostatistical Analyst,Arc GIS 9.0.For all the soil samples collected,the SAP content averaged 13.15 g·kg^-1,generally moderate in the soil,with an coefficient of variation（CV） being 163.99%.The spatial correlation distance（range） of the SAK content was 12.03 km,and the proportion of the semi-variogram model（C₀/（C₀+C）） was 66.68%,indicating a high semi-variogram value in the SAK content.The SAK content was 36.49 g·kg^-1 by average,generally low in the soil,and its CV was 78.02%.The spatial correlation distance of the SAK content was 12.10 km,and the proportion of the semi-variogram model was 63.80%,indicating a moderate semi-variogram value.These indicated that both the SAP and SAK contents had a moderate spatial correlation.The Kriging spatial interpolation showed both the SAP and SAK contents had a spatial nested distribution.The SAP content varied greatly,with the Grade 3 of the SAP content being most widely distributed in the agricultural land,higher in the central north and central east and gradually lower in the north,center,south and central west of Danzhou,while the SAK content varied less than the SAP content,and its Grade 5 was most widely distributed in the agricultural land,massively in the south,east and north of Danzhou.This spatial distribution may be related with landform,geological conditions,landuse,land management,etc.更多还原