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。
关键词:
半方差分析,
土壤水分,
垂直变异
Abstract: With semivariogram analysis, this paper s tudied vertical variabi li ty of soil water of dif ferent texture and different ferti li ty in the suburb of Bei jing.The resul ts of semivariogram analysis showed: when cul tivating wheat in winter and corn in summer, the range of vertical variabili ty of soil water was 50-60 cm, the de gree of heterogenei ty changing with the depth.The nugget variance to sil l ratio was 1. 41%-9. 26%, les s than 25%, which meant that soil water had higher autocorrelation in the range of vertical variabili ty. For di fferent texture, the lower autocorrela t ion and smal ler range of vertical variabili ty, the heavier of the texture of soil.As for dif ferent fertili ty, the degree of autocorrelation and range of vertical variabi li ty increased wi th the fertility.These resul ts have an important effect on the management and util ization of soi l water in fields.Moreover, to a definite accuracy the field work in soil water in practicewill be reduced on the basis of the rules of vertical variabili ty of soil water.
Key words:
Semivariogram analysis,
Soil water,
Vertical variability
中图分类号:
李红, 周连第, 张有山. 京郊平原区粮田土壤水分垂直变异性的半方差表征[J]. 华北农学报, 2003, 18(1): 111-113. doi: 10.3321/j.issn:1000-7091.2003.01.031.
LI Hong, ZHOU Lian di, ZHANG You shan. Quantification of Vertical Variability of Soil Water in Suburb Fields of Beijing[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2003, 18(1): 111-113. doi: 10.3321/j.issn:1000-7091.2003.01.031.