| 0.01molL-1CaCl2作为土壤不同N素形态浸提剂的研究 |
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| 引用本文： | 邵孝侯,胡霭堂,V. J. G. Hou,I. Novozamsky.0.01molL-1CaCl2作为土壤不同N素形态浸提剂的研究[J].土壤学报,1991,28(1):32-39. |
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| 作者姓名： | 邵孝侯 胡霭堂 V. J. G. Hou I. Novozamsky |
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| 作者单位： | 河海大学农水系;南京农业大学;荷兰Wageningen大学土壤和植物营养学;荷兰Wageningen大学土壤和植物营养学 |
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| 摘 要： | 本文用荷兰8种表土测试不同温度下0.01molL-1CaCl2提取液和淋滤液中N素各形态。试验结果表明温度对NO3--N提取量和淋滤量无影响,但对NH4+-N、可溶性总N和还原态N影响显著;可溶性有机态N的释放服从一级动力学方程:Nt=N0(1-e-kt),非线性最小二乘法能满意地拟合动力学实验结果。测定0.01molL-1CaCl2提取液中的可溶性有机态N对预测土壤N素矿化、合理推荐施肥及防止N素污染可能是一个很有前途的指标。
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| 关 键 词： | 土壤 氮 氮素形态 CaCl2 |
ASPECTS OF THE STUDY OF 0.01 molL-1 CaCl2 AS EXTRACTING SOLUTION FOR DIFFERENT N FRACTIONS IN SOILS |
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| Shao Xiaohou,Hu Aitang,V. J. G. Houba and I. Novozamsky.ASPECTS OF THE STUDY OF 0.01 molL-1 CaCl2 AS EXTRACTING SOLUTION FOR DIFFERENT N FRACTIONS IN SOILS[J].Acta Pedologica Sinica,1991,28(1):32-39. |
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| Authors: | Shao Xiaohou Hu Aitang V J G Houba and I Novozamsky |
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| Institution: | Hohai University;Nanjing Agricultural University;Wageningen Agricultural University, The Netherlands;Wageningen Agricultural University, The Netherlands |
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| Abstract: | Eight Dutch surface soils were used in this study to analyse different N fractions in 0.01 mo1L-1 CaCl2 extracts and percolates at different temperatures.The results obtained showed that:(1)The temperature of 0.01 mo1L-1 CaCl2 extracting and percolating solution had no influence on amount of NO3--N,the extractability of other N fractions (NH42-,total soluble N and reduced N),however was evidently affected by the temperature in 0.01 mo1L-1 CaCl2 solution.The hydrolysis of organic N was the predominant reason for this influence.(2) The release of organic soluble N obeyed the first order kinetics.A nonlinear least square method could bestfit the experimental data into the model Nt=N0(1-e-kt) with Rsquared being than 0.99.(3) The kinetic values No were highly consistent with the soluble reduced N in extraction exeperiment.The 0.01 mo1L-1 CaCl2 sollution exetracted and released the labile organic N fraction.The determinations of soluble orgaraic N in 0.01 mo1L-1 CaCl2 solution looked promising as a property for prediction of N mineralization,N fertilization and N pollution. |
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