Evolutionary characteristics of available phosphorus content in surface soil of Guangxi during 1984-2019
[Objective]To study the evolution characteristics of available phosphorus(AP)content in the surface soil of Guangxi from 1984 to 2019,providing scientific basis for rational formulation of crop fertilization management measures and improvement of soil fertility.[Method]Based on the data of Guangxi second soil survey project(1984),Guangxi formula fertilization project(2009)and the long-term positioning experiment data(2010-2019),geostatistics,dynamic attitude and distribution index were used to analyze the spatio-temporal evolution of AP content in surface soil in Guangxi and its distribution at different altitudes.[Result]From 1984 to 2019,the overall AP content in the sur-face soil of Guangxi has greatly increased.In 1984,the surface soil with low AP content(less than 10.0 mg/kg)accounted for about 80.00％of the total soil area of Guangxi.In 2019,the surface soil AP content was concentrated in the soil area of 10.0-40.0 mg/kg,ac-counting for 97.00％of the total soil area of Guangxi.The proportion of soil area classified as grade 2(20.0 mg/kg＜AP content ≤40.0 mg/kg)and grade 3(10.0 mg/kg＜AP content≤20.0 mg/kg)increased from 2.47％and 4.12％in 1984 to 43.38％and 48.57％in 2019,respectively.In terms of the rate of change,the soil area with grade 6(AP content ≤3.0 mg/kg)had the most rapid decrease with a dynamic index of-2.82％.On the other hand,the soil area with grade 2 had the most significant increase with a dynamic index of 47.28％.The overall rate of change showed the following order:grade 2＞grade 3＞grade 1(AP content＞40.0 mg/kg)＞grade 6＞grade 5(3.0 mg/kg＜AP content ≤5.0 mg/kg)＞grade 4(5.0 mg/kg＜AP content≤ 10.0 mg/kg).At different altitudes,the distribution index curves of soil areas with grade 1 and grade 6 experienced significant changes.In 1984,the distribution index of soil area with grade 1 at five elevation zones was 0.07,2.00,2.22,1.69 and 0.16,respectively.In 2019,the distribution index changed to 2.66,0.25,0,0 and 0,re-spectively.Similarly,in 1984,the distribution index of soil area with grade 6 at the five elevation zones was 1.33,1.15,0.96,0.80 and 0.90,respectively.In 2019,the distribution index changed to 0.12,0.08,1.94,7.95 and 1.76,respectively.[Conclusion]From 1984 to 2019,significant changes occurred in the level and spatial distribution pattern of AP content in the surface soil of Guangxi.In most areas,the AP content in the surface soil has significant increased and is mainly concentrated between 10.0 to 40.0 mg/kg.Soil type and altitude are important influencing factors,and human interference is among the direct reasons leading to the significant increase in AP content in the sur-face soil.Therefore,in the process of crop production in Guangxi,scientific fertilization should be further promoted,the proportion of organic fertilizer application should be increased,and the efficiency of phosphate fertilizer application should be improved.
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万方数据
