Characteristics of Soil Nutrient Variability and Spatial Distribution in Ugan-Kuqa Oasis
In order to investigate the soil nutrient levels and spatial distribution patterns in the Ugan-Ku-qa River delta oasis(hereinafter referred to as Ugan-Kuqa Oasis),a study of the soil nutrient levels and spatial distribution patterns was carried out.Based on 2020 land utilization data,a 1 km grid covering crop-land was generated using ArcGIS fishing net tool,spatial clustering was performed based on the 1 km grid cells,and 344 soil surface sites were deployed on three land use types,cropland,garden land and wasteland,with 194 cropland,64 garden land and 86 wasteland based on the leading of the agricultural land and taking into consideration of other land use types.Using classical statistics,Kriging interpolation and 3 S technolo-gy,we compared and analyzed the variation characteristics of alkali-hydrolyzable nitrogen(AN),available phosphorus(AP)and rapidly available potassium(AK)before and after the reclamation of arable land(arable land and wasteland),and from two perspectives of different land use types.The results showed that the AN content of the surface soil of the Ugan-Kuqa Oasis was radially decreasing from the north end to the periphery,the AP content was radially decreasing from the center to the east and west sides,and the AK content was radially increasing from the northwest end to the periphery.AN was the highest in garden land,while AK was the highest and AP was the lowest in wasteland.When the wasteland was reclaimed as arable land,the soil AN content increased slightly,the AP content increased significantly,and the AK con-tent decreased significantly.
Ugan-Kuqa Oasissoil nutrients3 S technologyvariation characteristicsspatial distribu-tion
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