Spatial Distribution Characteristics of Soil Phosphorus in Greenhouses of Dianchi Lake Basin

PurposeTo study the distribution characteristics of phosphorus in greenhouse soil in Dianchi Lake basin, and to provide reference for the control of non-point source pollution in Dianchi Lake basin and the safe use of greenhouse soil.

MethodA total of 102 surface soil samples from the Dianchi Lake basin were collected from June to August in 2014, and the total phosphorus, available phosphorus and water-soluble phosphorus of the soil samples were taken as the research objects. Based on the spatial analysis of geographic information system, the Kriging spatial interpolation of total phosphorus, available phosphorus and water-soluble phosphorus were carried out, and the spatial distribution map of phosphorus was obtained.

ResultThe total phosphorus content in the greenhouse soil of Dianchi Lake basin was 0.99-2.34 g/kg, the effective phosphorus content was 35.14-181.33 mg/kg, and the water soluble phosphorus content was 12.99-94.56 mg/kg. There was a positive correlation between total phosphorus content and water-soluble phosphorus content, spatial distribution of soil phosphorus in greenhouses in Dianchi Lake basin. The soil total phosphorus content and water-soluble phosphorus content in the east bank lakeside greenhouse planting area were the highest; and the soil available phosphorus content in the typical planting area of the west coast greenhouse was the highest. The accumulation of phosphorus had a serious impact on the environment of the Dianchi Lake.

ConclusionPhosphorus accumulation in the greenhouse of Dianchi Lake basin is significant, so reducing phosphorus loss in greenhouse soil is the key to preventing eutrophication in Dianchi Lake.