CAJ | 학술논문

以2008年3-9月对库库次级河流临江河回水区水质的调查为依据,分析了临江河回水区氮、磷营养盐的污染分布及富营养化特征.结果表明,临江河回水区氨氮(NH3-N)、总氮(TN)的浓度在7月中旬达到最小值,分别为1.963和5.128 mg/L,之后在9月初出现峰值,而磷酸盐(PO_4~(3-)-P)和总磷(TP)的浓度却呈现出先增加后下降的变化规律;氮主要来自点源污染,而磷受面源污染影响较大;溶解性无机氮(DIN)和PO_4~(3-)-P是TN与TP的主要存在形态,平均分别占TN和TP的85.3%和77.8%,而DIN又以NH_3-N为主.营养盐浓度呈现出回水区中游最高,回水末端次之,河口处最低的空间分布特征.叶绿素a(Chl-a)的浓度在4月和9月出现峰值,其空间分布特征与营养盐的类似.研究表明,临江河回水区在重度污染的情况下,即便是河流型水体也町能发生富营养化;流速对Chl-a浓度的显著影响呈指数关系.
이2008년3-9월대고고차급하류림강하회수구수질적조사위의거,분석료림강하회수구담、린영양염적오염분포급부영양화특정.결과표명,림강하회수구안담(NH3-N)、총담(TN)적농도재7월중순체도최소치,분별위1.963화5.128 mg/L,지후재9월초출현봉치,이린산염(PO_4~(3-)-P)화총린(TP)적농도각정현출선증가후하강적변화규률;담주요래자점원오염,이린수면원오염영향교대;용해성무궤담(DIN)화PO_4~(3-)-P시TN여TP적주요존재형태,평균분별점TN화TP적85.3%화77.8%,이DIN우이NH_3-N위주.영양염농도정현출회수구중유최고,회수말단차지,하구처최저적공간분포특정.협록소a(Chl-a)적농도재4월화9월출현봉치,기공간분포특정여영양염적유사.연구표명,림강하회수구재중도오염적정황하,즉편시하류형수체야정능발생부영양화;류속대Chl-a농도적현저영향정지수관계.
Based on the survey of water quality conducted between March and September in 2008,the pol-lution and distribution characters of nitrogen,phosphorus in the backwater region of the Linjiang River in the Three Gorges Reservoir and its eutrophication features were studied. The results showed that NH_3-N and TN ex-hibited the minimum concentrations of 1. 963 and 5. 128 mg/L respectively in the middle of July,and the peak values in early September; but PO_4~(3-)P and TP showed an increasing trend until early September; nitrogen was mainly caused by point source pollution,while phosphorus primarily by non-point source pollution; DIN (domina-ted by NH_3-N),PO_4~(3-)-P were the dominant forms of TN and TP respectively,accounting for 85.3% and 77.8% of TN and TP on average. The maximum concentrations of nutrients occurred in the middle reach of the backwa-ter region,followed by that of the inlet,and ranked last at the estuary. Meanwhile,Chl-a showed the peak val-ues both in April and September,and a similar spatial distribution with that of nutrient. Also,the study indica-ted that,under the severe contamination conditions,the eutrophication can take place even in the water body la-beled by river pattern; the flow velocity has shown a significant effect on Chl-a with an exponential relationship in the backwater region of the Lingjiang River.