长期不同施肥对潮土磷素吸附特征的影响
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1.土壤与农业可持续发展国家重点实验室/封丘农业生态实验站(中国科学院南京土壤研究所);2.中国科学院大学

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国家自然科学基金项目(41877023),国家重点研发计划项目(2016YFD0200304、2018YFD0200601)和江苏省农业科技自主创新资金项目(CX(20)2003)


Effects of Long-term Fertilization on Phosphorus Adsorption Characteristics of Fluvo-aquic Soils
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1.State Key Laboratory of Soil and Sustainable Agriculture/State Experimental Station of Agro-Ecosystem in Fengqiu, Institute of Soil Science, Chinese Academy of Sciences;2.University of Chinese Academy of Sciences

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National Natural Science Foundation of China(NO. 41877023), National Key Research and Development Projects(Nos.2016YFD0200304,2018YFD0200601) and Jiangsu Agriculture Science and Technology Innovation Fund(NO. CX(20)2003)

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    摘要:

    土壤磷素是限制潮土生产力提高的重要营养元素。研究不同施肥处理磷素的吸附特征及其与土壤理化性质的关系,可以为提高潮土磷素有效性和合理施肥提供科学依据。本研究基于封丘长期定位施肥试验,选用七种处理:不施肥(CK)、氮钾施肥(NK)、氮磷施肥(NP)、磷钾施肥(PK)、氮磷钾施肥(NPK)、1/2有机肥+1/2氮磷钾(1/2OM)和有机肥(OM),通过测定土壤理化性质和磷素吸附量,利用Langmuir和Freundlich等温吸附模型拟合了吸附曲线,并结合方程计算了最大吸附量(Qm)、亲和力常数(K)、最大缓冲能力(MBC)、吸附饱和强度(DPS)、Freundlich吸附常数(a)和吸附指数(b);运用相关分析和冗余分析(RDA)探讨了影响土壤磷素吸附特征变化的主要因素。结果表明:随着平衡溶液磷浓度的增加,不同施肥处理的磷素吸附量均表现出先快速增加,后缓慢增加的趋势。与CK和NK处理相比,NP、PK和NPK处理的磷素吸附能力增强,Qm和MBC分别增加了15.62%~23.60%和2.94%~23.46%;而1/2OM和OM处理的磷素吸附能力下降,K和MBC分别降低了39.60%~49.57%和36.09%~56.15%。相关分析和RDA结果表明:有机质(SOM)、pH、游离氧化铝(Ald)和C/P是影响潮土磷素吸附特征的主要因素。此外,1/2OM处理的DPS值相较于OM处理降低了30.92%。长期有机无机肥料配施可以增加有机质含量,降低磷素吸附能力,且相较于单施有机肥可以减少磷素流失风险。

    Abstract:

    【Objective】The availability of soil phosphorus (P) usually limits the productivity of fluvo-aquic soil. In order to provide a scientific basis for improving P use effectivency and rational fertilization in fluvo-aquic soils, the adsorption characteristics of P and its relationship with soil properties under long-term fertilization were studied.【Method】We selected seven treatments: no fertilizer (CK), no P fertilizer (NK), no potassium fertilizer (NP), no nitrogen fertilizer (PK), mineral fertilizer NPK (NPK), half compost plus half mineral fertilizer NPK (1/2OM) and compost alone (OM) in a long-term fertilization experiment at Fengqiu, to determine soil properties and P adsorption capacity. The Langmuir and Freundlich equations were used to fit the isothermal adsorption curves. Furthermore, the maximum adsorption capacity (Qm), adsorption constant (K), maximum buffer capacity (MBC), P adsorption saturation (DPS), Freundlich adsorption constant (a) and adsorption index (b) were calculated. Correlation analysis and redundancy analysis (RDA) were used to explore the vital factors affecting the soil P adsorption characteristics.【Result】The results showed that P adsorption in fluvo-aquic soil fitted both the Langmuir (R2≥0.80) and Freundlich (R2≥0.89) isotherms. With the increase of P concentration in the equilibrium solution, P adsorption capacity rapidly increased at first and then slowly afterwards. Compared with CK and NK, Qm and MBC of NP, PK and NPK increased by 15.62%~23.60% and 2.94%~23.46%, respectively, however, K and MBC of 1/2OM and OM reduced by 39.60%~49.57% and 36.09%~56.15%, respectively. Correlation analysis and RDA results showed that organic matter (SOM), pH, free Al oxides (Ald) and C/P were the main factors affecting P adsorption characteristics of fluvo-aquic soil. In addition, the DPS of 1/2OM was 30.92% lower than that of OM.【Conclusion】Long-term combined NPK fertilizer with compost can increase the content of SOM, reduce P adsorption capacity and reduce the risk of P loss compared with OM.

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杨娇,信秀丽,钟新月,丁世杰,张先凤,任国翠,朱安宁.长期不同施肥对潮土磷素吸附特征的影响[J].土壤学报,,[待发表]
Yang Jiao, Xin Xiuli, Zhong Xinyue, Ding Shijie, Zhang Xianfeng, Ren Guocui, Zhu Anning. Effects of Long-term Fertilization on Phosphorus Adsorption Characteristics of Fluvo-aquic Soils[J]. Acta Pedologica Sinica,,[In Press]

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