Inorganic phosphorus fractions and the influencing factors in saline-alkali soils under different land use types
We explored the characteristics of inorganic phosphorus fractions and influencing factors in saline-alkali soils in North China,by analyzing soil samples from eight land use types,including pepper field,mildly saline-alkali corn field,heavily saline-alkali corn field,sunflower field,Leymus chinensis grassland,Chloris virgata grass-land,Suaeda glauca grassland,and bare land.The results showed that the proportion of Ca10-P in soil inorganic phosphorus fractions of saline-alkali soil was the highest,and the proportions of other phosphorus fractions were fol-lowing an order of Ca8-P＞Al-P＞O-P＞Fe-P＞Ca2-P.The results of redundancy analysis and correlation analysis showed that Ca2-P and Ca8-P were significantly negatively correlated with soil pH,electrical conductivity,and sodium adsorption ratio(P＜0.05),but significantly positively correlated with available phosphorus,available nitro-gen,and available potassium(P＜0.05).Soil physicochemical factors explained 36.03％of the variations of inor-ganic phosphorus fractions.Ca2-P and Ca8-P of saline-alkali soil were the key fractions of soil phosphorus,and mainly affected by soil pH,electrical conductivity,and sodium adsorption ratio.According to the differences of phosphorus fractions and physicochemical properties of the eight land use types,pepper and sunflower can be used as the preferred crops for the improvement and utilization of mildly and severely saline-alkali land,respectively.L.chinensis can be used as a grassland species for ecological restoration of saline-alkali land.In addition,soil phos-phorus availability in saline-alkali lands can be enhanced by improving soil physicochemical properties such as pH,electrical conductivity,sodium adsorption ratio,and organic matter.
saline-alkali soilland use typeinorganic phosphorus fractionsoil physicochemical property
万方数据
维普
