【摘要】 选择典型黑土区双城市旱作玉米农田为研究区域,以耕层(0~20 cm)500个采样数据为基础,分析了土壤全氮和碱解氮的空间变化和现状;利用20世纪80年代和2005年2个时段1∶50000的土壤全氮和碱解氮空间分布图分析了22年来氮素的变化情况。结果表明,从空间分布来看,土壤全氮和碱解氮分别属于高度空间相关,结构性因子的影响占主导地位。22年来土壤全氮和碱解氮都呈上升趋势,2005年土壤全氮平均值为1.86 g/kg,比80年代的1.5 g/kg增加了0.36 g/kg,增幅为24%;土壤碱解氮平均值为137.8 mg/kg,比80年代增加了16.8mg/kg,增幅为13.9%。更多还原

【Abstract】 Soil total nitrogen(TN) content and soil alkali-hydrolysable nitrogen content(AN) of farmland in Shuangcheng were studied.500 soil samples were taken from the field with the soil layer of 0～20 cm,and got the map of soil nitrogen variance in 2005.The maps of soil TN and AN(1∶50000) in the 1980s were digitized and overlaid with the correspondent maps of 2005 using ArcMap.The results of geostatistics analysis showed that both of them were a relative significantly spatial heterogeneity,mainly affected by factors of structures.In the past 22 years’ succession survey for soil quantities from 1980s,TN and AN show increase.The average value of TN in 2005 was 1.86 g/kg,increasing by 0.36 g/kg,with the amplitude 24%;while the average value of AN in 2005 was 137.8 mg/kg,increasing by 16.8 mg/kg with the amplitude 13.9%.This analysis is very useful to help farmers use fertilizer properly,improve soil quality and preserve ecological environment.更多还原