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Long-term change in phosphorus behavior and the degree of P saturation in typical cropland after different fertilization practices

文献类型： 外文期刊

作者： Wu, Qihua 1 ; Huang, Zhenrui 3 ; Zhu, Ping 4 ; Wang, Boren 2 ; Zhang, Shuxiang 2 ; Ao, Junhua 1 ;

作者机构： 1.Guangdong Acad Sci, Inst Bioengn, Guangdong Modern Agr Resources & Environm & Agr P, Guangzhou 510316, Peoples R China

2.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Natl Engn Lab Improving Qual Arable Land, Beijing 100081, Peoples R China

3.Guangdong Acad Agr Sci, Crops Res Inst, Guangdong Prov Key Lab Crop Genet & Improvement, Guangzhou, Peoples R China

4.Jilin Acad Agr Sci, Ctr Agr Environm & Resources, Changchun, Peoples R China

关键词： P speciation; P sorption characteristics; degree of P saturation; long-term fertilization; cropland soils

期刊名称：SOIL SCIENCE AND PLANT NUTRITION （ 影响因子：1.929； 五年影响因子：2.634 ）

ISSN： 0038-0768

年卷期： 2022 年 68 卷 1 期

页码：

收录情况： SCI

摘要： Soils with continuous application of fertilizer phosphorus (P) may present high accumulations of P and may be at high risk of P loss. In this study, we investigated the effects of different fertilization strategies on soil P dynamics in three typical cropland soils over broad spatiotemporal scales in China. The soil P speciation (characterized both by Hedley fractionation and P-31 nuclear magnetic resonance (P-31 NMR)) and soil P sorption characteristics were examined under five fertilization treatments: unfertilized control (CK); chemical nitrogen (N) and potassium (K) (NK); N, P and K (NPK); NPK plus straw (NPKS); and NPK plus manure (NPKM). We found that with an increase of 100 kg ha(-1) in the cumulative P budget, the increases in Olsen-P and CaCl2-P contents ranged in 1.98-7.35 mg kg(-1) and 0.46-1.46 mg kg(-1), respectively, among the three soils. The recovery rates of P in Hedley fractionation (87-111%) were much higher than those of P-31 NMR spectroscopy (40-91%). More percentage of organic P was detected in Hedley fractionation than P-31-NMR in acidic soil, while more percentage of organic P was detected in P-31-NMR than Hedley fractionation in neutral and alkaline soils. Chemical fertilizer combined with manure or straw can decrease the bond strength (k) values compared to chemical fertilizer alone, while change trends in the maximum P sorption capacity (Qm) were dependent on the soil types. Moreover, the degree of P saturation (DPS) was significantly correlated with the cumulative P budget in each site. A change point in the relation between DPS and soil organic carbon (SOC) was found. After the change point, the DPS increased by 0.63-1.06% as the SOC increased by 0.1 g kg(-1). Agricultural measures that increased the contents of SOC and available P could increase DPS values effectively, especially manure amendment, which should be carefully considered to reduce P loss risk.

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