【摘要】 揭示耕层土壤有机质和全氮的空间变异规律及其影响因素,为实现土壤肥力评价和养分资源精准管理提供指导。利用GPS定位,在山西省洪洞县采集耕地表层土样(0～20 cm)1186个,应用了经典统计学和地统计学方法,对洪洞县耕层土壤有机质和全氮的空间变异特征进行了研究。结果表明洪洞县土壤有机质和全氮的平均含量分别为16.05 g kg-1和0.82g kg-1,属中等偏上水平;土壤有机质和全氮的变异系数分别为46.10%和32.47%,为中等变异程度。土壤有机质和全氮的空间相关距离分别为20.9 km和21.5 km;它们的空间变异主要是由结构性因素引起的。土壤有机质和全氮含量的空间分布格局基本一致,大致呈中部高、东部和西部低的趋势,主要受成土母质、地形地貌、土壤类型、土壤质地和施肥状况等因素的影响。更多还原

【Abstract】 [Objective] The objective of this study was to provide a firm scientific foundation for the evaluation of soil fertility and nutrient management by exploring the spatial characteristics of soil organic matter(SOM) and total nitrogen(TN),and the influencing factors.[Method] A total 1,186 topsoil(0-20cm) samples in arable land were taken across Hongdong County in Linfen basin in Shanxi Province.Topsoil SOM and TN were determined.The classic and geostatistical methods were used to analyze the data.The spatial variability of SOM and TN was investigated via their semi-variance models generated by GS+.The semi-variance model and GIS input was then used in a second software package: ArcGIS 9.2,to render SOM and TN classification maps for Hongdong County.[Results] The average SOM and TN content were high;16.05 and 0.82 g kg-1 respectively.The coefficients of variation for SOM and TN were 46.10% and 32.47% respectively.Analyses of the semi-variance models indicated that the range: the distances over which the variables were spatially-related,were 20.9 km for SOM and 21.5 km for TN.[Conclusion] The SOM and TN contents were generally high in central Hongdong whilst they were low in the northwest and southeast of the county and caused mainly by topography,soil type,soil texture and the impact of fertilization practices.更多还原