Characteristics of Nitrate Nitrogen Transport of Purple Sloped Soils in Response to Single and Intermittent Rainfalls

XIE Meixiang; HONG Dalin; FU Jing; ZHANG Zhanyu; ZHENG Chengxin; ZHANG Pingcang

doi:10.13870/j.cnki.stbcxb.2022.01.004

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Characteristics of Nitrate Nitrogen Transport of Purple Sloped Soils in Response to Single and Intermittent Rainfalls

更新时间：2025-03-12

- Characteristics of Nitrate Nitrogen Transport of Purple Sloped Soils in Response to Single and Intermittent Rainfalls
- Vol. 36, Issue 1, Pages: 24-29(2022)
- 作者机构：
  
  1. 南京水利科学研究院农村水利研究所,南京,210029
  2. 河海大学水利水电学院,南京,210098
  3. 长江科学院水土保持研究所,武汉,430010
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2022.01.004
  CLC： S157.1
- Published：2022
- 稿件说明：
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XIE Meixiang, HONG Dalin, FU Jing, et al. Characteristics of Nitrate Nitrogen Transport of Purple Sloped Soils in Response to Single and Intermittent Rainfalls[J]. 2022, 36(1): 24-29.
DOI：

XIE Meixiang, HONG Dalin, FU Jing, et al. Characteristics of Nitrate Nitrogen Transport of Purple Sloped Soils in Response to Single and Intermittent Rainfalls[J]. 2022, 36(1): 24-29. DOI： 10.13870/j.cnki.stbcxb.2022.01.004.

摘要

为探究不同降雨条件下不同观测时期硝氮在紫色土坡地中的迁移特征

通过室内土槽和人工模拟降雨装置

设置单次降雨和间歇性多次(12次)降雨条件

分别探讨短时期和长时期下的紫色土壤中硝氮迁移特征。结果表明: 在单次降雨后短期内紫色土坡地距地表 15 cm处土壤水和硝氮均匀地向下距地表 35 cm土壤坡脚处迁移

而在间歇性12次降雨条件下

前6次降雨中观测点硝氮浓度由初始345.7 mg/L急速下降至99.7 mg/L; 第7次到第9次降雨过程中硝氮浓度由平均值69.7 mg/L缓慢减少至52.0 mg/L

在最后的降雨中趋于稳定不变。随着降雨发生

硝氮在土壤中主要向下迁移

且坡顶处硝氮的迁移幅度最小

壤中流携带流失的硝氮浓度值约为土壤中硝氮浓度值的1/3。整体上壤中硝氮流失呈现出初期3次降雨后快速下降的趋势。研究结果从间歇性降雨的全新视角为紫色土坡地硝氮迁移流失特征研究提供依据和参考。

Abstract

To investigate characteristics of nitrate nitrogen transport in purple sloped soils at different periods under different rainfall events

laboratory soil tanks and simulated rainfall installation were equipped to set each single and total 12 intermittent rainfalls

and nitrate transport characteristics during short and long time periods were discussed respectively. In each soil tank

eight observed points were designed uniformly along the soil profile. The results showed that the soil water and nitrate nitrogen of purple sloped soils transported evenly from the upper 15 cm depth soil layer to the foot slope of lower 35 cm depth soil layer. However

nitrate concentrations of observed points declined rapidly from initial 345.7 mg/L to 99.7 mg/L during the first 6 rainfall events of 12 intermittent rainfalls; mean nitrate concentrations decreased from 69.7 mg/L to 52.0 mg/L during the 7th to 9th rainfall event

and tended to stable. As rainfall occurred

nitrate nitrogen transported towards the lower and foot of sloped soils

and the top of slope showed minimal transport. In addition

the nitrate concentration of subsurface outflow was about 1/3 of that of subsurface soil water. Overall

subsurface nitrate loss showed rapid decrease after 3 rainfall events. This research provided better understanding for nitrate transport and loss mechanism of purple sloped farmland as response to intermittent rainfall events

which was from a bran-new perspective.

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