Abstract: This paper took the wheat field of alluvial soil as the research site, aimed to the spatial pattern of wheatyield. With the help of GPS, 104 observing points were made in a wheat field approximate 3 ha on the north of XiaoqingheRiver in Shandong province in 2007??Geostatistics combined with geographical information system( GIS) was applied to revealthe spatial variability of wheat yield. Research results indicated the average wheat yield was 47.426 g/ kg, the highvalue was 64.508 g/ kg, the low value was 20.163 g/ kg. Field experiments and model prediction were employed in thispaper, the range, nugget and sill were calculated, semivariogram model of wheat yield was established, the interpolation methods were decided, the optimal interpolation by ordinary Kriging was selected, and the spatial distributing map of wheat yield was drawn. It is shown that the sem-i variogram structure of wheat yield was spherical, the nugget / sill of wheat yieldwas 1??655 and belonged to low intensity, there is high wheat yield in the southeast and south of the field, the spatial correlation distance of wheat yield was 171.62 m, a geostatistical analysis indicated that random factors( fertilizer utilization,environmental pollution, cultivation measures,management etc. ) were the main factors of the spat ial correlat ions of wheat yield.

Key words: Field scale, Geostat ist ics, Wheat yield

CLC Number: 

• S158