上海地区水稻土氮素矿化及其模拟
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*国家重点基础研究发展规划项目“土壤质量演变规律与持续利用”项目(G1990011811)资助


NITROGEN MINERALIZATION IN PADDY SOILS OF SHANGHAI REGION UNDER ANAEROBIC CONDITIONS:DYNAMICS AND MODEL FITTING
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    摘要:

    采用改进的培养方法和分析手段研究了上海地区典型水稻土淹水条件下的氮素矿化过程.结果表明矿化量为全N的40%~94%(N60~241mgkg-1).通过偏相关分析,矿化量只表现为与全N相关.矿化期间pH变化较大且与矿化量直线相关.选择(1)有效积温式;(2)一级反应式(One-pool模型);(3)两部分一级反应式(Two-pool模型);(4)带常数项的一级反应式(Special模型),对实验结果进行了拟合.非线性拟合表明Two-pool模型和Special模型最优,后者体现出温度效应.通过参数分析和实际应用可能性剖析,认为Special模型能对实际情况下的氮素矿化作出更为准确的描述.

    Abstract:

    The processes and characteristics of nitrogen mineralization in paddy soils of the Shanghai Region were studied with 120 days anaerobic incubation at 25℃ and 35℃.Results showed that the organic nitrogen mineralized amounted to 4.0% to 9.4% of total N(60 to 241 mg kg-1) and the mineral nitrogen was only correlated with total N(partial correlation analysis).pH changed greatly and was related to the mineral nitrogen contents during the mineralization.Temperature was one of the main factors influencing the mineralization of nitrogen.Four models,(1) effective cumulated temperature model;(2) a one-component,first order exponential model(one-pool model);(3) a two-component,first order exponential model(two-pool model) and (4) a two-component,mixed first and zero order exponential model including a constant term(special model),were fitted to the observed mineral-N vs incubation days using a non-linear regression procedure.The two-pool model and the special model gave the best fits amongst the four models.The special model was the unique one that could appropriately reflect the responses of organic nitrogen mineralization to incubation temperature in all studied paddy soils.All results showed the special model made the best prediction of nitrogen mineralization under flooded conditions.

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李慧琳,韩勇,蔡祖聪.上海地区水稻土氮素矿化及其模拟[J].土壤学报,2004,41(4):503-510. DOI:10.11766/trxb200305040402 Li Huilin, Han Yong, Cai Zucong. NITROGEN MINERALIZATION IN PADDY SOILS OF SHANGHAI REGION UNDER ANAEROBIC CONDITIONS:DYNAMICS AND MODEL FITTING[J]. Acta Pedologica Sinica,2004,41(4):503-510.

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  • 收稿日期:2003-05-04
  • 最后修改日期:2003-10-22
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  • 在线发布日期: 2013-02-25
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