论文部分内容阅读
以新疆农八师148团农田绿洲棉区为研究区,运用地统计学方法研究了1997、2002和2007年三个时期的土壤有机质含量时空变异特征及时间稳定性变化,为该地区棉田土壤培肥和管理提供理论依据。研究表明三个时期土壤有机质的变异系数相差不大,范围为16%~20%,属中等变异强度,随时间的增加,它们的空间相关性由强变弱,土壤有机质含量分布格局的变化总体呈增加趋势;在空间分布的时间稳定性上,有机质的平均变异系数是17.22%,其中有机质的稳定区域占其全部面积的24.14%,主要分布在研究区的中部,不稳定区域大约占23.44%,主要分布在研究区的东北部及西部边缘区。这种空间分布在时间上的不均匀性,可能与近年来研究区测土施肥工作的展开、耕作措施的不断改进及研究区土质分布状况有关。
Taking the farmland oasis cotton field in 148th group of Xinjiang Natsume division as the research area, this paper studied the spatial and temporal variation of soil organic matter content and the temporal stability changes by using the method of geostatistics in 1997, 2002 and 2007, Provide a theoretical basis for fertilizer and management. The results showed that the coefficient of variation of soil organic matter in the three periods had little difference, ranging from 16% to 20%, belonging to medium intensity of variation. With the increase of time, the spatial correlation of soil organic matter changed from strong to weak, and the distribution of soil organic matter The average coefficient of variation of organic matter was 17.22% in time stability of spatial distribution, of which the stable area of organic matter accounted for 24.14% of the total area of the organic matter, mainly distributed in the middle of the study area, with the unstable area accounting for about 23.44 %, Mainly distributed in the northeast and western edge of the study area. The spatial heterogeneity of the spatial distribution may be related to the development of soil testing and fertilization in recent years, the continuous improvement of cultivation measures and the distribution of soil quality in the study area.