Load and Output Character on Non-Point Nitrogen from Purple Soil Farmlands in Hilly Area of Central Sichuan Basin

CHEN Ke-liang; ZHU Xiao-dong; ZHU Bo; LI Qing-zhao; WANG Xiang-hua; CAI Bang-cheng

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Load and Output Character on Non-Point Nitrogen from Purple Soil Farmlands in Hilly Area of Central Sichuan Basin

更新时间：2024-11-07

- Load and Output Character on Non-Point Nitrogen from Purple Soil Farmlands in Hilly Area of Central Sichuan Basin
- Vol. 20, Issue 2, Pages: 54-58(2006)
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  CLC： X5
- Published：2006
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CHEN Ke-liang, ZHU Xiao-dong, ZHU Bo, et al. Load and Output Character on Non-Point Nitrogen from Purple Soil Farmlands in Hilly Area of Central Sichuan Basin[J]. 2006, 20(2): 54-58.
DOI：

CHEN Ke-liang, ZHU Xiao-dong, ZHU Bo, et al. Load and Output Character on Non-Point Nitrogen from Purple Soil Farmlands in Hilly Area of Central Sichuan Basin[J]. 2006, 20(2): 54-58. DOI：

摘要

通过在中国科学院盐亭农业生态站进行定位监测研究

探讨了川中紫色土区旱坡地氮素的农业非点源输出规律。研究表明:紫色土早坡地非点源氮输出以无机氮和颗粒态为主

全氮输出量不高。川中丘陵农田生态系统的旱地径流中

颗粒态氮占比例最大

达到35%

硝态氮和氨态氮的输出水平相反

各径流场的NH4 -N浓度略高于NO3--N的浓度。旱地径流全年总氮污染输出为0.95 kg/(hm2.a)

全年通过径流输出的氮素占化肥施用量的0.56%。旱地地表径流中总氮平均浓度顺坡种植>平板种植>聚土垄作。小流域非点源氮污染负荷的季节变化与流域降水的季节变化基本一致

非点源氮污染约从6月开始上升

一直持续到10月

集中在降雨丰富的时段。夏季2个月(7~8月)是非点源污染的高发季节

非点源氮污染负荷的绝大部分发生于该时期

这与年雨量的60%集中于该季节而降水多以暴雨形式出现有关。通过土地利用类型的优化配置

合理采用水土保持耕作法

控制施肥量和适宜的农田耕作方式

可减少地表径流和地下淋洗中氮的含量

减轻农业非点源物质对环境的压力

保护农业生态环境。

Abstract

Nitrogen non-point sources pollution researches from purple soil cropland were carried out in Yanting agro-ecological station(CAS) watershed.Nitrogen output and transportation observation was conducted in surface runoff plots of different purple soil farmlands.Nitrogen concentrations and forms of runoff were monitored twice a month with two replicates.Nitrogen pollution load was calculated based on above observed and investigated data.Impact of non-point sources pollution of nitrogen on the environment was discussed here.Results showed

In the upland runoff

particle nitrogen contributes 35% to total nitrogen(TN).Average concentration of total nitrogen in farmland runoff was in following sequence: SNTRCS(seasonal no-tillage ridge cropping system)

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Related Institution

The Research Center of Soil and Water Conservation and Ecological Environment， Chinese Academy of Sciences and Ministry of Education， Yangling

Institute of Soil and Water Conservation， Chinese Academy of Sciences and Ministry of Water Resources， Yangling

University of Chinese Academy of Sciences

College of Soil and Water Conservation Science and Engineering （Institute of Soil and Water Conservation），Northwest A&F University， Yangling

School of Infrastructure Engineering， Nanchang University

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