CAJ | 학술논문

本研究通过对江西千烟洲香溪流域雨季氮湿沉降及径流过程进行监测,分析降雨及径流过程的各形态氮浓度变化,探讨南方红壤区氮湿沉降特征及其对流域氮输出的影响.结果表明：①2014年雨季(3~6月)共27场降雨,产生的氮湿沉降负荷达43.64~630.59 kg,氮沉降通量为0.44~6.43 kg?hm -2,呈现出极大的季节变异性；②对其中3场降雨过程进行动态分析发现,当降雨量为8~14 mm 时,流域氮沉降负荷达18.03~41.16 kg,而该地区氮湿沉降通量为0.18~0.42 kg?hm -2.其中3场次降雨事件导致流域水体的总径流量为4189.38 m3,TN 总流失负荷16.72 kg,输出通量为4.64 kg?hm -2； DTN 总流失负荷为9.64 kg,输出通量为2.68 kg?hm -2； NH +4-N总流失负荷2.93 kg,输出通量为0.81 kg?hm -2； NO -3-N总流失负荷5.60 kg,输出通量为1.56 kg?hm -2.③流域氮湿沉降对流域氮输出的贡献率约为56％~94％,说明降雨对流域氮流失影响巨大,并以硝酸盐为主,流域水体中总氮浓度超过河流水体富营养化阈值(1.5 mg?L -1)存在发生富营养化的隐患.
본연구통과대강서천연주향계류역우계담습침강급경류과정진행감측,분석강우급경류과정적각형태담농도변화,탐토남방홍양구담습침강특정급기대류역담수출적영향.결과표명：①2014년우계(3~6월)공27장강우,산생적담습침강부하체43.64~630.59 kg,담침강통량위0.44~6.43 kg?hm -2,정현출겁대적계절변이성；②대기중3장강우과정진행동태분석발현,당강우량위8~14 mm 시,류역담침강부하체18.03~41.16 kg,이해지구담습침강통량위0.18~0.42 kg?hm -2.기중3장차강우사건도치류역수체적총경류량위4189.38 m3,TN 총류실부하16.72 kg,수출통량위4.64 kg?hm -2； DTN 총류실부하위9.64 kg,수출통량위2.68 kg?hm -2； NH +4-N총류실부하2.93 kg,수출통량위0.81 kg?hm -2； NO -3-N총류실부하5.60 kg,수출통량위1.56 kg?hm -2.③류역담습침강대류역담수출적공헌솔약위56％~94％,설명강우대류역담류실영향거대,병이초산염위주,류역수체중총담농도초과하류수체부영양화역치(1.5 mg?L -1)존재발생부영양화적은환.
In this study, Qianyanzhou Xiangxi River Basin in the rainy season was monitored to measure different nitrogen form concentrations of rainfall and rainfall-runoff process, in order to explore the southern red soil region of nitrogen wet deposition characteristics and its influence on N output in watershed. The results showed that there were 27 times rainfall in the 2014 rainy season, wherein N wet deposition load reached 43. 64-630. 59 kg and N deposition flux were 0. 44-6. 43 kg?hm - 2 , which presented a great seasonal variability. We selected three rainfall events to make dynamic analysis. The rainfall in three rainfall events ranged from 8 to 14mm, and the deposition load in the watershed were from 18. 03 to 41. 16 kg and its flux reached 0. 18 to 0. 42 kg?hm - 2 . Meanwhile, this three rainfall events led to 4 189. 38 m3 of the total runoff discharge, 16. 72 kg of total nitrogen(TN) load and 4. 64 kg?hm - 2 of flux, wherein dissolved total nitrogen (DTN) were 9. 64 kg and 2. 68 kg?hm - 2 , ammonium-nitrogen (NH +4 -N) were 2. 93 kg and 0. 81 kg?hm - 2 , nitrate-nitrogen (NO -3 -N) were 5. 60 kg and 1. 56 kg?hm - 2 . The contribution rate of N wet deposition to N output from watershed reached 56% -94% , implying that the rainfall-runoff had tremendous contribution to N loss in this small watershed. The concentrations of TN in water had exceeded 1. 5 mg?L - 1 of eutrophication threshold, which existed an eutrophication potential.