CAJ | 학술논문

2006年3、5、8月,对三蛱水库成库后5条支流的上游区和回水区水质参数及营养因子分布进行了初步研究.研究结果表明,支流高锰酸盐指数范围在1.00-2.50mg/L、COD范围为6.00-26.5mg/L,上游区与回水区有机物含量差异不大,支流目前未受到有机物污染影响.NH_4~+-N范围为0.039-0.367mg/L,各支流含量均为丰水期最大.TN范围在0.58-1.67mg/L,TP范围在0.005-0.133mg/L,支流回水区TN和TP含量均远高于水体发生富营养化的最低限制值,水体存在发生富营养化的风险.大多支流N/P比值处于适宜藻类生长范围.Chl.a浓度范围为0.94-28.9mg/m~3,各支流回水区Chl.a浓度均为5月最大.河流回水区Chl.a浓度高于上游区,上游区、回水区Chl.a含量有显著差异.选用修正的Carlson营养状态指数(Trophic State Index)TSI_M法,评价了支流水体营养状态,TSI_M指数范围在36.0-64.2,上游区除龙河、澎溪河5月达到富营养水平外,其余支流均为贫-中营养水平.回水区各支流均达到中-富营养水平.支流回水区营养状态指数均高于上游区,但各支流增加幅度不同.支流回水区水体营养状态明显受三峡水库蓄水水体流速减缓的影响.Chl.a与COD(n=15,P＜0.01)呈极显著正相关,与其它营养因子无明显相关关系.三峡水库完工后,支流回水区水体流速减缓,富营养化趋势可能加重.
2006년3、5、8월,대삼협수고성고후5조지류적상유구화회수구수질삼수급영양인자분포진행료초보연구.연구결과표명,지류고맹산염지수범위재1.00-2.50mg/L、COD범위위6.00-26.5mg/L,상유구여회수구유궤물함량차이불대,지류목전미수도유궤물오염영향.NH_4~+-N범위위0.039-0.367mg/L,각지류함량균위봉수기최대.TN범위재0.58-1.67mg/L,TP범위재0.005-0.133mg/L,지류회수구TN화TP함량균원고우수체발생부영양화적최저한제치,수체존재발생부영양화적풍험.대다지류N/P비치처우괄의조류생장범위.Chl.a농도범위위0.94-28.9mg/m~3,각지류회수구Chl.a농도균위5월최대.하류회수구Chl.a농도고우상유구,상유구、회수구Chl.a함량유현저차이.선용수정적Carlson영양상태지수(Trophic State Index)TSI_M법,평개료지류수체영양상태,TSI_M지수범위재36.0-64.2,상유구제룡하、팽계하5월체도부영양수평외,기여지류균위빈-중영양수평.회수구각지류균체도중-부영양수평.지류회수구영양상태지수균고우상유구,단각지류증가폭도불동.지류회수구수체영양상태명현수삼협수고축수수체류속감완적영향.Chl.a여COD(n=15,P＜0.01)정겁현저정상관,여기타영양인자무명현상관관계.삼협수고완공후,지류회수구수체류속감완,부영양화추세가능가중.
Through sampling and analyzing in 5 typical tributaries of Three Gorges Reservoir,parameters of the water quality and main nutrients were monitored in Mar.,May and Aug.of 2006.The variation of permenganate index of oxygen demand and COD ranged from 1.00-2.50mg/L and 6.00-26.5mg/L respectively.Concentration of organic contamination was not discrepancy in upstream and backwater areas.Values of ammonia nitrogen(NH_4~+-N),total nitrogen(TN)and total phosphorus(TP)were 0.039-0.367mg/L,0.58-1.67mg/L and 0.005-0.133mg/L,respectively.Concentration of NH_4~+-N in Aug.was higher than thoses in Mar.and May,when concentrations of TN and TP were largely exceed the minimum limited value of eutrophic state.The ratio of TN and TP were favored well for algae growth in nearly all tributaries.Chl.a ranged from 0.94-28.9mg/m~3.Chl.a values in backwater areas of tributaries were exceed upstream and the concentration of Chl.a in May was higher than in Mar.and Aug..Utilizing the method of modified Carlson trophic state index(TSI_M)has assessed the trophic states of the studied area.The values of TSI_M ranged from 36.0-64.2,showing that the trophic state of upstream area was oligotropher to mesotropher and the backwater areas were mesotropher to eutropher.Trophic state of backwater areas were poorer than upstream,and was affected by impoundment of the Three Gorges Reservoir.There was a significant positive correlation between Chl.a and COD,but Chl.a was not significant correlation with other nutrient factors. After the Three Gorges Reservoir was completed in 2009, eutrophic trend of tributaries in backwater areas would be more serious with the decrease of flow velocity.