Chemical speciation of phosphorus in farmland soils and soil aggregates around mining areas

被引:10
|
作者
Zhao, Wantong [1 ,2 ]
Gu, Chunhao [3 ,4 ]
Zhu, Mengqiang [5 ]
Yan, Yupeng [6 ]
Liu, Zhe [1 ,2 ]
Feng, Xionghan [1 ,2 ]
Wang, Xiaoming [1 ,2 ]
机构
[1] Huazhong Agr Univ, Coll Resources & Environm, Key Lab Arable Land Conservat Middle & Lower Reach, Minist Agr & Rural Affairs, Wuhan 430070, Peoples R China
[2] State Environm Protect Key Lab Soil Hlth & Green R, Wuhan 430070, Peoples R China
[3] Univ Delaware, Delaware Environm Inst, Environm Soil Chem Grp, Newark, DE 19716 USA
[4] Univ Delaware, Dept Plant & Soil Sci, Newark, DE 19716 USA
[5] Univ Wyoming, Dept Ecosyst Sci & Management, Laramie, WY 82071 USA
[6] Jiangxi Agr Univ, Coll Land Resources & Environm, Key Lab Poyang Lake Watershed Agr Resources & Ecol, Nanchang 330045, Peoples R China
关键词
Farmland soils; P speciation; Fe; Al fractions; Chemical extraction; Correlation analysis; P K-edge XANES; K-EDGE XANES; SIZE FRACTIONS; SEQUENTIAL FRACTIONATION; PHOSPHATE ADSORPTION; AGRICULTURAL SOILS; IRON; EXTRACTION; SORPTION; TRANSFORMATION; OXIDES;
D O I
10.1016/j.geoderma.2023.116465
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Phosphorus (P) speciation determines its bioavailability, mobility, and environmental risk in soils. Farmland soils around mining areas are worldwide distributed, yet the P speciation in such soils remains poorly understood. In this study, we determined the P speciation in the farmland soils and soil aggregates around mining areas from China and evaluated their relationship with soil pH and Fe/Al fractions using chemical extraction, P K-edge X-ray absorption near-edge (XANES) spectroscopy, and correlation analysis. Chemical extraction revealed that soil P was dominated by inorganic P (Pi) (68.0 - 82.5%) largely associated with pedogenic Fe/Al oxides (43.4% - 94.8%). The P was mainly adsorbed and occluded by Fe/Al oxides in acidic soils, while predominantly existed as Ca-P and occluded species in alkaline soils. The presence of heavy metals appeared to have no significant effect on P speciation in these soils. Compared with the macroaggregates, the available P, total P, and their ratio all increased dramatically in the soil colloids (< 0.002 mm) due to the accumulation of Fe/Al oxides. The XANES analysis indicated that the P speciation in the acidic soils and soil aggregates was dominated by Fe-P, followed by Al-P, and little Ca-P; in contrast, the proportions of Ca-P increased but Fe-P decreased in the alkaline soils and soil aggregates. Compared with the macroaggregates, the proportions of Fe-P increased while Ca-P decreased in the soil colloids. Correlation analysis indicated that amorphous Al and isomorphic substitution Al played critical roles in P immobilization by pedogenic Fe/Al oxides. These new insights into the P speciation are essential for environmental risk assessment and efficient utilization of P in the farmland soils.
引用
收藏
页数:10
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