中国农业科学 ›› 2019, Vol. 52 ›› Issue (21): 3866-3877.doi: 10.3864/j.issn.0578-1752.2019.21.015

• 专题:土壤磷素演变与高效利用 • 上一篇    下一篇

长期不同施肥处理黑土磷的吸附-解吸特征及 对土壤性质的响应

王琼1,2,展晓莹1,3,张淑香1(),彭畅4,高洪军4,张秀芝4,朱平4,GILLES Colinet2   

  1. 1 中国农业科学院农业资源与农业区划研究所/耕地培育技术国家工程实验室,中国北京 100081
    2 Gembloux Agro-Bio Tech, University of Liege, Passage des deportes 2, 5030 Gembloux, Belgium
    3 中国农业科学院农业环境与可持续发展研究所/农业清洁流域创新团队/农业部农业环境重点实验室, 中国北京 100081
    4 吉林省农业科学院农业环境与资源研究中心,中国长春130033
  • 收稿日期:2019-07-01 接受日期:2019-08-21 出版日期:2019-11-01 发布日期:2019-11-12
  • 通讯作者: 张淑香
  • 作者简介:王琼,E-mail: wqcaas@gmail.com
  • 基金资助:
    国家公益性行业(农业科研专项201503120);国家自然科学基金(41471249)

Phosphorus Adsorption and Desorption Characteristics and Its Response to Soil Properties of Black Soil Under Long-Term Different Fertilization

WANG Qiong1,2,ZHAN XiaoYing1,3,ZHANG ShuXiang1(),PENG Chang4,GAO HongJun4,ZHANG XiuZhi4,ZHU Ping4,GILLES Colinet2   

  1. 1 Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China
    2 Gembloux Agro-Bio Tech, University of Liege, Passage des deportes 2, 5030 Gembloux, Belgium
    3 Institute of Environment and Sustainable Development in Agriculture /Agricultural Clean Watershed Research Group, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
    4 Agricultural Environment and Resources Center, Jilin Academy of Agricultural Sciences, Changchun 130033, China
  • Received:2019-07-01 Accepted:2019-08-21 Online:2019-11-01 Published:2019-11-12
  • Contact: ShuXiang ZHANG

摘要:

目的 长期不同施肥处理影响土壤磷库和土壤性质的变化。研究不同施肥处理下黑土磷的吸附解析特征及其与土壤性质的响应关系,为黑土合理施用磷肥,提高磷有效性提供理论依据。方法 本研究依托于公主岭黑土肥力长期定位试验,供试作物为玉米。选取不施肥(CK)、施氮、钾肥(NK)、氮磷钾平衡施肥(NPK)、氮磷钾+有机肥(NPKM)4个处理。取1990、2000和2010年的0—20 cm土层的土壤样品,分析土壤性质,测定磷的吸附解吸值,并用 Langmuir方程拟合了磷的吸附曲线,计算磷最大吸附量(Qmax)、磷吸附常数(K)、最大缓冲容量(MBC)、磷吸附饱和度(DPS)以及土壤易解吸磷(RDP)。结果 Langmuir吸附等温线方程能很好的拟合土壤吸附磷和相应的平衡溶液磷浓度曲线(R 2=0.93—0.99)。不同施肥处理磷吸附解吸特征参数具有明显的差异。随试验年限的增加,不同处理各特征参数变化不尽相同,与1990年相比,2010年不施磷处理(CK和NK),Qmax值分别增加了1.83和1.61倍,MBC值分别增加了0.80%和49.40%,DPS值分别降低了92.04%和87.50%,RDP值分别降低了20.00%和82.83%;NPK处理Qmax和DPS值分别增加了81.39%和90.74%,MBC和 RDP值分别降低了79.37%和48.57%;NPKM处理Qmax和MBC值分别降低了33.35%和78.52%,DPS和RDP值分别增加了11.36倍和1.48倍。施肥21年后,与CK和NPK处理相比,NPKM处理的Qmax值降低了64.66%和 49.52%,MBC值降低了81.87%和79.56%,DPS值增加了110和3.81倍,RDP值增加了4.36倍和78.57%。NPKM处理显著增加了土壤全磷(Total-P)、有效磷(Olsen-P)、有机质(SOM)和CaCO3含量,降低了比表面积,维持pH、游离铁铝氧化物值不变。冗余分析结果表明:SOM和Total-P是造成磷吸附解吸特征参数差异的主要因素,分别解释了全部变异的49.5%和18.7%(P<0.05)。 结论 长期有机无机配施可显著增加SOM和土壤中磷素累积,降低土壤对磷的吸附能力,增加土壤对磷的解吸,提高土壤磷的有效性,但同时显著提高了土壤磷吸附饱和度,易引起磷素流失的风险,对于NPKM处理应考虑有机肥与无机肥的投入量。

关键词: 长期施肥, 黑土, 磷吸附解吸, 土壤性质

Abstract:

【Objective】 Fertilizer is generally added to agricultural soil to meet the needs of crop production, but long-term over fertilization changes soil phosphorus (P) pool and soil properties. This study evaluated the characteristics change of P adsorption and desorption and its response to soil properties under long-term fertilization, to do a favor to provide theoretical basis of rational fertilizer application and improve the P availability of black soil.【Method】 Four treatments, including no fertilizer (CK), urea and potash sulphate (NK), urea, super-calcium phosphate and potash sulphate (NPK), and NPK plus pig manure (NPKM), were investigated in a 21-year (1989-2010) long-term fertilization experiment at Gongzhuling (Jilin Province) of China. The crop of cropping system was maize. Soil samples were collected in 1990, 2000 and 2010 at 0-20 cm depth to analyze soil properties and to measure soil P adsorption and desorption characteristics. Langmuir equation was used to fit the P adsorption curve, and then the maximum adsorption capacity (Qmax), adsorption constant (K), buffering capacity of soil P (MBC), and P sorption saturation (DPS) were calculated according to Langmuir equation.【Result】 There was a good fitness between the P adsorption curve and Langmuir equation (R 2=0.93-0.99, P<0.01). There existed difference for P adsorption and desorption characteristic under the four treatments. Over time, compared with initial year, for CK and NK treatments, the Qmax value increased by 1.83 and 1.61 times, MBC value increased by 0.80% and 49.40%, DPS value decreased by 92.04% and 87.50%, Readily Desorbable Phosphorus (RDP) value decreased by 20.00% and 82.83%, respectively; for NPK treatment, Qmax and DPS value increased by 81.87% and 79.56%, MBC and RDP value decreased by 79.37% and 48.57%, respectively, while under NPKM treatment, the Qmax and MBC value decreased by 33.35% and 78.52%, DPS and RDP values increased by 11.36 and 1.48 times, respectively. After 21 years experiments, compared with CK and NPK treatments, the Qmax and MBC value of NPKM treatment decreased by 64.66% and 49.52%, 81.87% and 79.56%, respectively; the DPS and RDP value of NPKM treatment increased by 110 and 3.81 times, 4.36 times and 78.57%, respectively. Compared with other treatments, the Total-P, Olsen-P, soil organic matter (SOM) and CaCO3 contents increased and SSA decreased significantly, but the pH, free Fe2O3 and Al2O3 value kept unchanged under NPKM treatment. RDA test showed that SOM and Total-P were the main factors that explained 49.5% and 18.7% of the total variation (P<0.05) which caused the difference of P adsorption desorption characteristic parameters among four treatments.【Conclusion】 Long-term combination of NPK fertilizers with manures could significantly increase SOM and P accumulation contents, decrease the soil adsorption capacity and increase desorption capacity, and improve P availability in soil, but it significantly increased the DPS value, easily thereby caused the risk of phosphorus loss. Therefore, various management practices and inorganic and organic P fertilizer input amounts should be considered to reduce P losses from this area.

Key words: long-term fertilization, black soil, P adsorption and desorption, soil properties