北京昌平区农地土壤优先流影响硝态氮运移的试验分析
Experimental analysis of preferential flow and its effect on nitrate nitrogen migration in soil of farmland at Changping district in Beijing
查看参考文献20篇
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文摘
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为了探讨在优先流影响下农地土壤水分与溶质的运移规律,以昌平农地土壤为研究对象,通过原状土取样和分层填充制备实验土柱,模拟存在优先流和平衡入渗2种水分下渗过程,分析优先流对农地土壤中硝态氮运移的影响。结果表明:相较于平衡入渗,存在优先流的土壤中硝态氮运移的速率更快、数量更多,且其穿透曲线表现出拖尾现象。优先流的存在会使土壤的水分出流速率达到平衡入渗过程的1.48~2.69倍,且波动程度较大;受其影响,硝态氮运移表现出快速、大量下渗的特征,原状土柱中NO_3~-的穿透时间为12h,此时的孔隙体积为0.36,相较于填充土柱分别减少了57%和27%。此外,原状土柱中以NO_3~-标记的优先流占水流总量的43.83%,引起的NO_3~-累计淋出量占总量的97.60%,这表明有限的优先流流量能够引起绝大部分的硝态氮运移。土壤优先流还使得其穿透曲线表现出拖尾现象,这可能是由于优先流和基质流之间下渗速率的不平衡造成的。 |
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其他语种文摘
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In order to investigate the principles of the farmland soil water and solute migration under the influence of preferential flow, a comparison was studied between undisturbed and packed soil columns which represented for non-balancing and balancing infiltration respectively. With the methods, the effect of preferential flow on nitrate nitrogen migration was studied in the agricultural land at Changping district. The results showed that nitrate nitrogen migrated in higher rates and in greater numbers under the promotion of soil preferential flow, and tailing was also a vital appearance in the preferential flow's Break Through Curve. The water flow rate with preferential flow in soil appeared larger degree of volatility, and was 1.48-2.69 times of that of balancing infiltration. Since the nitrate ions are non-absorptive, the migration of nitrate nitrogen was characterized with higher rates and greater numbers as influenced by preferential flow. The breakthrough time of undisturbed soil column was 12h with a 57% reduction compared to the packed one, and the leachate volume of undisturbed soil column was 0.36 times of Pore Volume when the nitrate ions penetrated which was 0.73 times of that of the packed one. In addition, the preferential flow of NO_3~-in undisturbed soil column accounted for 43.83% of total flux, but resulted to a 97.60% accumulative lechate mass for NO_3~-in total mass. These results indicated that the preferential flow with limited ratio in total flux could lead to a large proportion of NO_3~-migration. Tailing was an important phenomenon in the preferential flow's BTC and was a unique feature of the curve, it may be caused by the disproportion of preferential flow to matrix flow on penetration rate in the infiltration progress. |
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来源
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中国水土保持科学（中英文）
,2013,11(4):36-41 【核心库】
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关键词
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农地
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优先流
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硝态氮
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运移
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地址
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1.
北京林业大学水土保持学院, 北京, 100083
2.
北京水保生态工程咨询有限公司, 北京, 100055
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北京市延庆县水土保持工作站, 北京, 102200
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1672-3007 |
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学科
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农业基础科学 |
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基金
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国家自然科学基金
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国家自然科学基金
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国家"十二五"科技支撑计划"三峡库区典型区段长防林建设及质量调控技术"
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文献收藏号
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CSCD:4926987
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参考文献 共
20
共1页
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|
1.
Flury M. Susceptibility of soils to preferential flow of water: A field study.
Water Resources Research,1994,30(7):1945-1954
|
被引
64
次
|
|
|
|
|
2.
Wang Z. Susceptibility and predictability of conditions for preferential flow.
Water Resources Research,1998,34(9):2169-2182
|
被引
13
次
|
|
|
|
|
3.
Dekker L W. Moisturedistributions and wettingrates of soils at experimentalfields in the Netherlands, France, Sweden and Germany.
Journal of Hydrology,1999,215(1/4):4-22
|
被引
18
次
|
|
|
|
|
4.
Beven K. Macropores and water flow in soils.
Water Resources Research,1982,18(5):1311-1325
|
被引
150
次
|
|
|
|
|
5.
Watson K W. Estimating macroporosity in a forest watershed by use of a tension infiltrometer.
Soil Science Society of America Journal,1986,50(3):578-582
|
被引
50
次
|
|
|
|
|
6.
Isensee A R. Groundwaterresidues of atrazine, alachlor, and cyanazine under no-tillage practices.
Chemosphere,1988,17(1):165-174
|
被引
11
次
|
|
|
|
|
7.
Southwick L M. Leaching of nitrate, atrazine, and metribuzin from sugarcane in southern louisiana.
Journal of Environmental Quality,1995,24(4):684-690
|
被引
5
次
|
|
|
|
|
8.
Kelly B P. Preferential flow and transport of nitrate and bromide in clay pan soil.
Ground Water,1998,36(3):484-494
|
被引
4
次
|
|
|
|
|
9.
Kladivko E J. Pesticide and nitrate transport into subsurface tile drains of different spacings.
Journal of Environmental Quality,1999,28(3):997-1004
|
被引
9
次
|
|
|
|
|
10.
倪余文. 土壤优先水流及污染物优先迁移的研究进展.
土壤与环境,2000,9(1):60-63
|
被引
16
次
|
|
|
|
|
11.
Allaire-Leung S E. Water and solute movement in soil as influenced by macropore characteristics: 1. Macropore continuity.
Journal of Contaminant Hydrology,2000,41(3/4):283-301
|
被引
18
次
|
|
|
|
|
12.
Allaire-Leung S E. Water and solutemovement in soil as influenced by macropore characteristics: 2. Macropore tortuosity.
Journal of Contaminant Hydrology,2000,41(3/4):303-315
|
被引
8
次
|
|
|
|
|
13.
牛健植. 贡嘎山暗针叶林生态系统溶质优先运移分析.
北京林业大学学报,2009,31(5):48-53
|
被引
3
次
|
|
|
|
|
14.
陈效民. 太湖地区农田土壤中硝态氮垂直运移的规律.
中国环境科学,2001,21(6):481-484
|
被引
21
次
|
|
|
|
|
15.
Johnsson H. Simulated nitrogen dynamics and losses in a layered agricultural soil.
Agriculture Ecosystems & Environment,1987,18(4):333-356
|
被引
15
次
|
|
|
|
|
16.
Skopp J. Solute movement in structured soils: two-region model with small interaction.
Soil Science Society of America Journal,1981,45(5):342-837
|
被引
9
次
|
|
|
|
|
17.
王彬俨. 北京昌平区农地土壤大孔隙特征.
水土保持学报,2012,26(3):189-193
|
被引
12
次
|
|
|
|
|
18.
Singh P. Preferential solute transport through macropores in large undisturbed saturated soil columns.
Journal of Environmental Quality,1991,20(1):295-300
|
被引
10
次
|
|
|
|
|
19.
Aubertin G M.
Nature and extent of macropores in forest soils and their influence on subsurface water movement, RP-NE-192,1971
|
被引
1
次
|
|
|
|
|
20.
邵明安.
土壤物理学,2006
|
被引
277
次
|
|
|
|
|
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