【摘要】 利用半方差分析对不同土壤质地和不同土壤肥力的土壤水分在垂直方向上的变异做了初步研究。结果表明:在京郊平原粮田冬小麦、夏玉米一年两作的种植制度下,土壤水分在垂直方向上变异的变程为50～60cm,土壤水分在垂直方向上块金值与基台值之比为1 41%～9 26%,远小于25%。说明不同土壤质地的土壤水分在各自的变程范围内存在高度的空间相关性,其中土壤质地越粘重,变程越小,空间相关性越弱;同一质地肥力越高,变程越大,空间相关性越大。更多还原

【Abstract】 With semivariogram analysis,this paper studied vertical variability of soil water of different texture and different fertility in the suburb of Beijing.The results of semivariogram analysis showed:when cultivating wheat in winter and corn in summer,the range of vertical variability of soil water was 50-60 cm,the degree of heterogeneity changing with the depth.The nugget variance to sill ratio was 1.41%-9.26%,less than 25%,which meant that soil water had higher autocorrelation in the range of vertical variability.For different texture,the lower autocorrelation and smaller range of vertical variability,the heavier of the texture of soil.As for different fertility,the degree of autocorrelation and range of vertical variability increased with the fertility.These results have an important effect on the management and utilization of soil water in fields.Moreover,to a definite accuracy the field work in soil water in practice will be reduced on the basis of the rules of vertical variability of soil water.更多还原