LI Wen-juan,YAN Yong-hao,ZHENG Ji-yong,et al.Effect of Biochar on the Transfer of Nitrate in Three Different Soils on the Loess Plateau[J].Research of Soil and Water Conservation,2013,20(05):60-63,68.
生物炭对黄土高原不同质地土壤中NO3-N运移特征的影响
- Title:
- Effect of Biochar on the Transfer of Nitrate in Three Different Soils on the Loess Plateau
- Keywords:
- Loess Plateau; soil; biochar; nitrate; transfer
- 分类号:
- S153.6+1
- 摘要:
- 为了解生物炭在抑制黄土高原农田土壤可溶态养分淋失方面的功效，通过人工模拟实验，研究土壤中添加生物炭后对硝态氮运移的影响，为黄土高原地区农田非点源污染防治及氮循环研究等提供科学依据。选择黄土高原地区三种不同质地土壤类型（风砂土、黄绵土、塿土），通过室内土柱模拟研究方法，用连续流动分析仪（SKALAR-SAN++）测定出流液的硝态氮浓度，通过硝态氮的穿透曲线分析在稳态条件下，生物炭添加及不同添加量对土壤中硝态氮运移的影响。结果表明：对于质地较粗黄绵土和风沙土，生物炭输入能够降低硝态氮的淋失，随添加量增加，其阻滞作用越强。对于质地较为粘细的土，添加生物炭反而促进了硝态氮淋失，随添加量增加，其促进作用越强。稳态条件下，三种土壤的硝态氮穿透过程均符合对流弥散方程。研究表明加入生物炭对不同质地土壤中可溶态养分的影响不同，可以促进质地较粗土壤的保肥能力，却不利于质地较为粘细土壤硝态氮养分的保持。
- Abstract:
- To determine how addition of biochar can restrain the leaching of soluble nutrients in farmland soil on the Loess Plateau, the simulation experiments were used to study the effect of biochar made from apple tree’s branches with three addition rates on transfer of nitrate in three soils with different texture from the Loess Plateau through comparing BTCs (Break throught curve, BTC), by means of soil colume simulation in the steady contion in lab, and provide the scientific basis for non-point source pollution control and the nitrogen cycle research. The continuous flow analyzer (SKALAR-SAN) was used to measure sap nitrate concentration, nitrate breakthrough curves were analyzed under steady state conditions, biochar addition and different amounts of nitrate in soil migration. The results showed that biochar can restrain the leaching of nitrate in soils with coarse texture such as leossial soil and sandy soil, moreover, the restrain function would increase with the biochar addition rate. However, the biochar showed the acceleation function on leaching of nitrate in clay loam soil, and this function would increase with the addition rate. After biochar additon, the nitrate transfer in soils can be described by convective-disppersive equation (CDE). Studies have shown that adding biochar in soil with different textures different effects on soluble nutrients can promote capacity of coarse texture soil to keep the nutrients, but not be conducive to nitrate nutrient retention in the fine soil with more sticky texture.
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备注/Memo
收稿日期:2013-04-15;改回日期:2013-05-16。
基金项目:国家自然科学基金（41071195）；中国科学院西部行动计划项目（KZCX2-XB3-13）；校科研专项项目（QN2011145）
作者简介:李文娟(1986-),女,陕西武功人,硕士研究生,主要研究方向为生物炭土壤环境效应。E-mail:578382278@qq.com
通讯作者:郑纪勇(1974-),男,山东聊城人,副研究员,博士,硕士生导师,主要从事农田生态系统物质迁移方面的研究。E-mail:zhjy@ms.iswc.ac.cn