【摘要】 以江苏省姜堰市沈高农场为例,用地质统计学方法研究了冬小麦生育期内土壤水分和碱解氮的时空变异性,并分析了它们与产量的关系。结果表明,土壤水分和产量属弱变异性,碱解氮属中等变异性;除播前土壤水分外,产量及各阶段土壤水分、碱解氮均由趋势、剩余残差的空间相关部分和随机部分组成,所有变量都具有中等以上空间结构性;土壤水分空间分布随时间变化较大,碱解氮随时间变化不大;各时期碱解氮与产量都呈显著正相关,苗期相关性最强,灌浆期土壤水分含量与产量有一定正相关关系。更多还原

【Abstract】 Taking example for Shengao farm situated in Jiangyan of Jiangsu Province,spatio-temporal variability of soil water content and alkali-hydrolyzable N(AN) is studied using geostatistics and their relationship with yield is analyzed.The results indicates:①Spatial dependence of soil water content and yield are weak and the coefficient of variation for AN belongs to the middle degree.②Except for soil water content before sowing,yield and soil variables at different stages were composed of the trend,the random component and spatial component from the detrended data.All of soil variables were moderate-highly spatially dependent.③Spatial distribution of soil water content greatly changes with time and that of AN changes little with time.④Winter wheat yield is significantly correlated with AN at different stages and the correlation coefficient is maximum at the seedling stage.Soil water content at the stage of milky ripeness is correlated with yield at some degree.The study provides the basic data and theoretical basis for realizing precise management.更多还原