| 硝化作用驱动下红壤渗漏液的酸化 |
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| 引用本文： | 钱琛,蔡祖聪.硝化作用驱动下红壤渗漏液的酸化[J].土壤学报,2010,47(1):77-83. |
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| 作者姓名： | 钱琛 蔡祖聪 |
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| 作者单位： | 1. 土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所),南京,210008;扬州工业职业技术学院应用化学系,江苏扬州,225127
2. 土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所),南京,210008 |
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| 基金项目： | 国家自然科学基金重点项目（40830531）资助 |
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| 摘 要： | 土壤渗漏液pH对于亚热带酸性土壤的物质迁移和溶液中物质形态具有重要影响。为了研究亚热带酸性土壤硝化作用释放H+与渗漏液pH的关系,以具有不同硝化强度的3个红壤样本为供试材料,分别加入铵态氮0、150和300 mg kg-1,进行112 d的室内土柱模拟淋溶实验。结果表明:酸性土壤的渗漏液并不一定呈酸性。土壤渗漏液pH取决于硝化作用产生H+的速率与土壤酸缓冲能力的综合作用。当硝化作用使渗漏液中NO3-浓度升高至一定程度时,渗漏液pH突然下降,这一临界NO3-浓度与土壤盐基饱和度及加入土壤的铵态氮量呈线性正相关(p0.05)。所以,硝化作用最强的旱地土壤,由于其盐基饱和度达81%,渗漏液始终保持中性;而硝化作用不强、盐基饱和度为21%的灌丛土壤,其渗漏液pH可降至4.0以下。
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| 关 键 词： | 硝化作用 交换性盐基 离子交换 缓冲能力 酸化 |
Acidification of leachates initiated by nitrification in subtropical acid soils |
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| Qian Chen and Cai Zucong.Acidification of leachates initiated by nitrification in subtropical acid soils[J].Acta Pedologica Sinica,2010,47(1):77-83. |
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| Authors: | Qian Chen and Cai Zucong |
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| Institution: | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences; Department of Applied Chemistry, Yangzhou Polytechnic Institute;State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences |
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| Abstract: | pH of leachate plays an important role in translocation of matters in the soil and form of substances in soil solution in subtropical acid soils.To study relation between H+ released in nitrification and pH of soil leachate in the soils,an indoor simulated leaching experiment was carried out for 112 days using soil samples different in nitrification intensity amended with 0,150,and 300 mg kg-1(NH4HCO3)-N,separately and leached 17 times,once a week.Results show that the leachates from the acid soils were not... |
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| Keywords: | Nitrification Exchangeable base Ion exchange Buffering capacity Acidification |
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