洞庭湖区水稻土有机氮矿化的模型模拟
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摘要
有机氮矿化是土壤氮循环的关键过程,预测土壤有机氮矿化对于评价土壤供氮能力具有重要意义。本研究利用有效积温、双曲线、一阶(One-pool)和二阶(Two-pool)指数模型拟合洞庭湖区典型水稻土有机氮矿化过程,并分析模型参数与土壤有机氮组分间的关系。结果表明,洞庭湖区不同发育类型水稻土有机氮矿化表现出明显差异,各培养时期累积矿化氮量总体上表现为潴育性水稻土>潜育性水稻土>淹育性水稻土。各矿化模型均可对各试验土壤有机氮矿化过程进行有效拟合,但综合比较模型拟合决定系数(R~2)、均方根误差值及参数取值显示,One-pool指数模型拟合效果最差,有效积温模型和双曲线模型次之,Two-pool指数模型拟合效果最优。各模型拟合的不同土壤间有机氮矿化速率常数变异较小,与各有机氮组分均无显著相关性(P>0.05);不同有机氮组分中,氨基酸氮和氨态氮与矿化模型中表征土壤有机氮矿化强度或矿化势的各参数始终具显著正相关关系(r=0.755～0.950,P<0.05)。通径分析结果进一步显示,氨基酸氮是土壤有机氮矿化强度或矿化势变化的最主要决策组分并起直接影响作用。Two-pool指数模型将土壤可矿化有机氮分为易矿化氮和难矿化氮两类,相对于其他模型可更为准确地描述研究区水稻土有机氮素的矿化;固定该模型中两类可矿化有机氮库的矿化速率常数取值,有助于提升模型实时定量预测土壤矿化供氮的实用性。
Soil organic nitrogen mineralization( SONM) is a critical N cycling process. Quantitative prediction of SONM is essential for assessing soil N supply capacity. In this study,four different mineralization models( i. e.,effective accumulated temperature,hyperbolic,One-pool and Two-pool exponential models) were selected to fit SONM process in nine typical paddy soils in Dongting Lake region. The relationships between model parameters and soil organic nitrogen components were analyzed using correlation and path analysis. Results showed that SONM rate substantially varied with soil subtypes. The cumulative mineralized N measured throughout the whole incubation periods generally ranked as Fluvisols > Gleysols > Cambisols. Basing on the coefficients of determination( R~2),root-mean-square error estimations and model fitted parameter values,all the four models could effectively simulate the SONM process,of which Two-pool exponential model consistently had the best fitting effect,followed by hyperbolic,effective accumulated temperature and the One-pool exponential model. Pearson correlation analysis showed that model fitted SONM rate constants were insignificantly( P > 0. 05) correlated with soil organic nitrogen components due to their weak variability. On the contrary,all model parameters of characterizing SONM intensity or potential had significant positive correlations with amino acid N and ammonium N( r = 0.755-0.950,P<0.05). Furthermore,amino acid N was the primary organic N component directly affecting soil mineralizable N capacity. Our results suggested that the Twopool exponential model could simulate SONM process more effectively than others as it could reveal the mineralization processes of soil active and slow pools of mineralizable N simultaneously.Thus,Two-pool exponential model could improve the validity and accuracy of SONM prediction by assigning fixed values for the mineralization rate constants of soil active and slow mineralizable organic N pools.
Soil organic nitrogen mineralization( SONM) is a critical N cycling process. Quantitative prediction of SONM is essential for assessing soil N supply capacity. In this study,four different mineralization models( i. e.,effective accumulated temperature,hyperbolic,One-pool and Two-pool exponential models) were selected to fit SONM process in nine typical paddy soils in Dongting Lake region. The relationships between model parameters and soil organic nitrogen components were analyzed using correlation and path analysis. Results showed that SONM rate substantially varied with soil subtypes. The cumulative mineralized N measured throughout the whole incubation periods generally ranked as Fluvisols > Gleysols > Cambisols. Basing on the coefficients of determination( R~2),root-mean-square error estimations and model fitted parameter values,all the four models could effectively simulate the SONM process,of which Two-pool exponential model consistently had the best fitting effect,followed by hyperbolic,effective accumulated temperature and the One-pool exponential model. Pearson correlation analysis showed that model fitted SONM rate constants were insignificantly( P > 0. 05) correlated with soil organic nitrogen components due to their weak variability. On the contrary,all model parameters of characterizing SONM intensity or potential had significant positive correlations with amino acid N and ammonium N( r = 0.755-0.950,P<0.05). Furthermore,amino acid N was the primary organic N component directly affecting soil mineralizable N capacity. Our results suggested that the Twopool exponential model could simulate SONM process more effectively than others as it could reveal the mineralization processes of soil active and slow pools of mineralizable N simultaneously.Thus,Two-pool exponential model could improve the validity and accuracy of SONM prediction by assigning fixed values for the mineralization rate constants of soil active and slow mineralizable organic N pools.
引文
陈书信,王国兵,阮宏华,等.2014.苏北沿海不同土地利用方式土壤氮矿化季节变化特征.生态学杂志,33(2):276-282.
胡淑娟,雷晓云,邢坤,等.2017.西天山气象因子对融雪期积雪深度影响通径分析.气象与环境科学,40(3):33-37.
姬景红,张玉龙,张玉玲,等.2009.灌溉方法对保护地土壤有机氮矿化特性的影响.土壤学报,46(5):869-877.
解小莉,袁志发.2013.决策系数的检验及在育种分析中的应用.西北农林科技大学学报:自然科学版,41(3):111-114.
李世清,李生秀,杨正亮.2002.不同生态系统土壤氨基酸氮的组成及含量.生态学报,22(3):379-386.
李文军,杨奇勇,杨基峰,等.2017.长期施肥下洞庭湖区水稻土氮素矿化及其温度敏感性研究.农业机械学报,48(11):261-270.
梁国庆,林葆,林继雄,等.2000.长期施肥对石灰性潮土氮素形态的影响.植物营养与肥料学报,6(1):3-10.
刘青丽,任天志,李志宏,等.2010.植烟黄壤氮素矿化动态模拟研究.植物营养与肥料学报,16(2):400-406.
穆兴民,樊小林.1999.土壤氮素矿化的生态模型研究.应用生态学报,10(1):114-118.
彭银燕,黄湘运,孙梅.2012.长期施肥条件下水稻土有机氮组分及矿化特性研究.水土保持学报,26(5):173-176.
秦子娴,张宇亭,周志峰,等.2013.长期施肥对中性紫色水稻土氮素矿化和硝化作用的影响.中国农业科学,46(16):3392-3400.
伍玉鹏,邓婵娟,姜炎彬,等.2015.长期施肥对水稻土有机氮组分及氮素矿化特性的影响.农业环境科学学报,34(10):1958-1964.
杨路华,沈荣开,覃奇志.2003.土壤氮素矿化研究进展.土壤通报,34(6):569-571.
袁志发,周静芋,郭满才,等.2001.决策系数-通径分析中的决策指标.西北农林科技大学学报:自然科学版,29(5):131-133.
张玉树,张金波,朱同彬,等.2015.不同种植年限果园土壤有机氮组分变化特征.生态学杂志,34(5):1229-1233.
赵阳,张驰,赵竑绯,等.2013.氮磷添加对亚热带常绿阔叶林土壤氮素矿化的影响.生态学杂志,32(7):1690-1697.
Benbi DK,Richiter J.2002.A critical review of some approaches to modeling nitrogen mineralization.Biology and Fertility of Soils,35:168-183.
Bremner JM.1965.Organic forms of soil nitrogen//Black CA.Methods of Soil Analysis.Madison Wisconsin USA:American Society of Agronomy.
Camargo FAO,Gianello C,Tedesco MJ.2004.Soil nitrogen availability evaluated by kinetic mineralization parameters.Communication in Soil Science and Plant Analysis,35:1293-1307.
Christensen BT,Olesen JE.1998.Nitrogen mineralization potential of organomineral size separates from soils with annual straw incorporation.European Journal of Soil Science,49:25-36.
Dou ZX,Toth JD,Jabro JD,et al.1996.Soil nitrogen mineralization during laboratory incubation:Dynamics and model fitting.Soil Biology&Biochemistry,28:625-632.
Elliott ET,Paustian K,Frey SD.1996.Modelling the measurable or measuring the modellable:A hierarchical approach to isolating meaningful soil organic matter fractions//Powlson DS,Smith P,Smith JU,et al.eds.Evaluation of Soil Organic Models Using Existing Long-term Datasets.Berlin:Springer:161-179.
Guntiňas ME,Letrós MC,Trasar-Cepeda C,et al.2012.Effects of moisture and temperature on net soil nitrogen mineralization:A laboratory study.European Journal of Soil Biology,48:73-80.
Inubushi K,Wada H,Takai Y.1985.Easily decomposable organic matter in paddy soil.6.Kinetics of nitrogen mineralization in submerged soils.Soil Science and Plant Nutrition,31:563-572.
Kader MA,Sleutel S,Begum SA,et al.2013.Nitrogen mineralization in subtropical paddy soils in relation to mineralogy,management,p H,carbon,nitrogen and iron contents.European Journal of Soil Science,64:47-57.
Li HL,Han Y,Cai ZC.2003.Nitrogen mineralization in paddy soils of the Taihu region of China under anaerobic conditions:Dynamics and model fitting.Geoderma,115:161-175.
Li SX,Wang ZH,Miao YF,et al.2014.Soil organic nitrogen and its contribution to crop production.Journal of Integrative Agriculture,13:2061-2080.
Li WJ,Peng BF,Zhao D,et al.2016.Assessing chemical soil tests for predicting nitrogen mineralization in paddy soils of the Dongting Lake region in China.Journal of Soils and Sediments,16:2419-2429.
Lu HL,Li SQ,Jin FH,et al.2008.Effects of soluble organic Non evaluation soil N-supplying capacity.Agricultural Sciences in China,7:860-870.
Lu HL,Li SQ,Jin FH,et al.2009.Contributions of organic nitrogen forms to mineralized nitrogen during incubation experiments of the soils on the Loess Plateau.Communications in Soil Science and Plant Analysis,40:3399-3419.
Paul EA,Clark FE.1989.Soil Microbiology and Biochemistry.San Diego,CA:Academic Press.
Sahrawat KL.2010.Nitrogen mineralization in lowland rice soils:The role of organic matter quantity and quality.Archives of Agronomy and Soil Science,56:337-353.
Schulter HR,Schnitzer M.1998.The chemistry of soil organic nitrogen:A review.Biology and Fertility of Soils,26:1-5.
Stanford G,Frere MH,Schwaninger DH.1973.Temperature coefficient of soil nitrogen mineralization.Soil Science,115:321-323.
Wang WJ,Smith CJ,Chen D.2003.Towards a standardized procedure for determining the potentially mineralisable organic nitrogen of soil.Biology and Fertility of Soils,37:362-374.
Wang WJ,Smith CJ,Chen D.2004.Predicting soil nitrogen mineralization dynamics with a modified double exponential model.Soil Science Society of America Journal,68:1256-1265.
Yeasmin S,Mominul Islam AKM,Aminul Islam AKM.2012.Nitrogen fractionation and its mineralization in paddy soils:A review.Journal of Agricultural Technology,8:775-793.
胡淑娟,雷晓云,邢坤,等.2017.西天山气象因子对融雪期积雪深度影响通径分析.气象与环境科学,40(3):33-37.
姬景红,张玉龙,张玉玲,等.2009.灌溉方法对保护地土壤有机氮矿化特性的影响.土壤学报,46(5):869-877.
解小莉,袁志发.2013.决策系数的检验及在育种分析中的应用.西北农林科技大学学报:自然科学版,41(3):111-114.
李世清,李生秀,杨正亮.2002.不同生态系统土壤氨基酸氮的组成及含量.生态学报,22(3):379-386.
李文军,杨奇勇,杨基峰,等.2017.长期施肥下洞庭湖区水稻土氮素矿化及其温度敏感性研究.农业机械学报,48(11):261-270.
梁国庆,林葆,林继雄,等.2000.长期施肥对石灰性潮土氮素形态的影响.植物营养与肥料学报,6(1):3-10.
刘青丽,任天志,李志宏,等.2010.植烟黄壤氮素矿化动态模拟研究.植物营养与肥料学报,16(2):400-406.
穆兴民,樊小林.1999.土壤氮素矿化的生态模型研究.应用生态学报,10(1):114-118.
彭银燕,黄湘运,孙梅.2012.长期施肥条件下水稻土有机氮组分及矿化特性研究.水土保持学报,26(5):173-176.
秦子娴,张宇亭,周志峰,等.2013.长期施肥对中性紫色水稻土氮素矿化和硝化作用的影响.中国农业科学,46(16):3392-3400.
伍玉鹏,邓婵娟,姜炎彬,等.2015.长期施肥对水稻土有机氮组分及氮素矿化特性的影响.农业环境科学学报,34(10):1958-1964.
杨路华,沈荣开,覃奇志.2003.土壤氮素矿化研究进展.土壤通报,34(6):569-571.
袁志发,周静芋,郭满才,等.2001.决策系数-通径分析中的决策指标.西北农林科技大学学报:自然科学版,29(5):131-133.
张玉树,张金波,朱同彬,等.2015.不同种植年限果园土壤有机氮组分变化特征.生态学杂志,34(5):1229-1233.
赵阳,张驰,赵竑绯,等.2013.氮磷添加对亚热带常绿阔叶林土壤氮素矿化的影响.生态学杂志,32(7):1690-1697.
Benbi DK,Richiter J.2002.A critical review of some approaches to modeling nitrogen mineralization.Biology and Fertility of Soils,35:168-183.
Bremner JM.1965.Organic forms of soil nitrogen//Black CA.Methods of Soil Analysis.Madison Wisconsin USA:American Society of Agronomy.
Camargo FAO,Gianello C,Tedesco MJ.2004.Soil nitrogen availability evaluated by kinetic mineralization parameters.Communication in Soil Science and Plant Analysis,35:1293-1307.
Christensen BT,Olesen JE.1998.Nitrogen mineralization potential of organomineral size separates from soils with annual straw incorporation.European Journal of Soil Science,49:25-36.
Dou ZX,Toth JD,Jabro JD,et al.1996.Soil nitrogen mineralization during laboratory incubation:Dynamics and model fitting.Soil Biology&Biochemistry,28:625-632.
Elliott ET,Paustian K,Frey SD.1996.Modelling the measurable or measuring the modellable:A hierarchical approach to isolating meaningful soil organic matter fractions//Powlson DS,Smith P,Smith JU,et al.eds.Evaluation of Soil Organic Models Using Existing Long-term Datasets.Berlin:Springer:161-179.
Guntiňas ME,Letrós MC,Trasar-Cepeda C,et al.2012.Effects of moisture and temperature on net soil nitrogen mineralization:A laboratory study.European Journal of Soil Biology,48:73-80.
Inubushi K,Wada H,Takai Y.1985.Easily decomposable organic matter in paddy soil.6.Kinetics of nitrogen mineralization in submerged soils.Soil Science and Plant Nutrition,31:563-572.
Kader MA,Sleutel S,Begum SA,et al.2013.Nitrogen mineralization in subtropical paddy soils in relation to mineralogy,management,p H,carbon,nitrogen and iron contents.European Journal of Soil Science,64:47-57.
Li HL,Han Y,Cai ZC.2003.Nitrogen mineralization in paddy soils of the Taihu region of China under anaerobic conditions:Dynamics and model fitting.Geoderma,115:161-175.
Li SX,Wang ZH,Miao YF,et al.2014.Soil organic nitrogen and its contribution to crop production.Journal of Integrative Agriculture,13:2061-2080.
Li WJ,Peng BF,Zhao D,et al.2016.Assessing chemical soil tests for predicting nitrogen mineralization in paddy soils of the Dongting Lake region in China.Journal of Soils and Sediments,16:2419-2429.
Lu HL,Li SQ,Jin FH,et al.2008.Effects of soluble organic Non evaluation soil N-supplying capacity.Agricultural Sciences in China,7:860-870.
Lu HL,Li SQ,Jin FH,et al.2009.Contributions of organic nitrogen forms to mineralized nitrogen during incubation experiments of the soils on the Loess Plateau.Communications in Soil Science and Plant Analysis,40:3399-3419.
Paul EA,Clark FE.1989.Soil Microbiology and Biochemistry.San Diego,CA:Academic Press.
Sahrawat KL.2010.Nitrogen mineralization in lowland rice soils:The role of organic matter quantity and quality.Archives of Agronomy and Soil Science,56:337-353.
Schulter HR,Schnitzer M.1998.The chemistry of soil organic nitrogen:A review.Biology and Fertility of Soils,26:1-5.
Stanford G,Frere MH,Schwaninger DH.1973.Temperature coefficient of soil nitrogen mineralization.Soil Science,115:321-323.
Wang WJ,Smith CJ,Chen D.2003.Towards a standardized procedure for determining the potentially mineralisable organic nitrogen of soil.Biology and Fertility of Soils,37:362-374.
Wang WJ,Smith CJ,Chen D.2004.Predicting soil nitrogen mineralization dynamics with a modified double exponential model.Soil Science Society of America Journal,68:1256-1265.
Yeasmin S,Mominul Islam AKM,Aminul Islam AKM.2012.Nitrogen fractionation and its mineralization in paddy soils:A review.Journal of Agricultural Technology,8:775-793.
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