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RISS 인기검색어
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- 저자 : 남스라이자갈 ( Namsrai Jargal ) (검색결과 3 건)
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인공저수지의 영양염류-N:P비율 상태의 계절적 변동과 토지이용도에 따른 영양염류-Chl-a 상관관계
남스라이자갈 ( Namsrai Jargal ),이상재 ( Sang-jae Lee ),안광 ( Kwang-guk An ) 한국환경생태학회 2021 한국환경생태학회 학술대회지 Vol.2021 No.2
Water quality degradation and eutrophication are strongly related to land-use practices around freshwater systems. Here, we investigated an impact of predominant land use on seasonal dynamics of organic matters, nutrients, the ratios of N:P and CHL-a:TP, and algal biomass in Korean reservoirs (n=9) based on long-term monitoring of 2006-2020. It was also examined relationships between nutrients and the algal biomass in reservoirs altered by predominant land-use pattern. The algal biomass was assessed by chlorophyll-a (CHL-a) concentration. Compared to forest-dominated reservoirs (FDRs), agricultural dominant reservoirs (ADRs) and estuarine reservoirs (ERs) manifested relatively high concentrations of suspended solids (TSS), organic matters, phosphorus contents, and the algal biomass, especially the ERs. According to total phosphorus (TP) averages in each type of reservoir, a risk of blue-green algal dominance was high in the ERs (~80%), moderate in the ADRs (~40%), and low in the FDRs (< 10%) for our study. The intense rainfall periods during July - August were a primary environmental factor for seasonal increases of nutrients into the reservoirs. Particularly, the escalation in TP was observably in line with rainfall runoff into the ADRs. But total nitrogen (TN) in the ERs visibly reduced during the intense rainfall months due to ionic dilution by rainfall-water. The seasonal dynamic of predicted CHL-a differed through the three types of reservoirs, showing a seasonal distinct pattern of algal bloom. Correspondingly, the seasonal dynamic in CHL-a:TP ratio varied by the land-use patterns. It was relatively higher during winter in the ERs, and yet showed higher values during summer and fall in the ADRs. The seasonal reduction in N:P ratio was strongly connected to the increase of TP, as well as an intensity of anthropogenic activity. Furthermore, the empirical regression model showed that the algal biomass was significant positive relation with both TN (R2=0.44, p<0.001) and TP (R2=0.78, p<0.001), whereas showing negatively associated to N:P ratio (R2=0.49, p<0.001). However, the empirical nutrients-CHL-a models in reservoirs altered by the predominant land-use patterns. TP was most important predictor of CHL-a level in both the FDRs (R2=0.60, p<0.001) and the ADRs (R2=0.87, p<0.001), supporting P-limitation for algal growth. But the power of TP-CHL-a relation observably reduced for the ERs (R2=0.25, p<0.05) compared to the FDRs and the ADRs. This result was mainly driven by hypereutrophic nutrient conditions, and thus light availability was likely a more important predictor of CHL-a level in the ERs.
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다목적 저수지 유입 영양염류, Chl-a 상태에 대한 장마기간의 장기적 및 계절 영향 평가
남스라이자갈 ( Namsrai Jargal ),우스만아티크 ( Usman Atique ),마문MD ( Md Mamun ),블랜디나제네스카코레 ( Blandina Genes Kakore ),안광국 ( Kwang-guk An ) 한국환경생태학회 2021 한국환경생태학회 학술대회지 Vol.2021 No.2
Due to rapid eutrophication, sustainable water quality management and supply are essential in drinking water sources and aquatic biota in large reservoirs. We evaluated the potentially crucial factors influencing the algal chlorophyll (Chl-a), nutrients, and the links between the rainfall and other vital elements in a large multipurpose reservoir (Yongdam Reservoir) during 2013-2019. We developed the empirical models on algal Chl-a, total phosphorus (TP), total nitrogen (TN), and TN:TP’s ambient ratios considering the maneuvering influence of Asian monsoons. The intensive rainfall during the monsoon months strongly impacted the nutrient regime and other vital factors. The seasonal patterns of algal Chl-a varied in response to the nutrient contents (TN, TP), suspended solids, and ambient N:P ratios along the longitudinal gradient. The conditional plot analysis, empirical modeling, and observations supported an overall P-limitation scenario, as was evident from the magnitude of N:P ratios (R2 = 0.36, F = 24.9, p < 0.001). Furthermore, the reservoir’s trophic status alluded to the larger particles and blue-green algae during the monsoon and postmonsoon months. The correlation analysis, Mann- Kendall trend test, and principal component analysis illustrated compelling links between CHL-a, TP, and rainfall regime. The outcomes suggested the reservoir was primarily controlled by phosphorus limitation, with an increasing CHL-a tendency along with nitrogen dilution. However, a slight decline in phosphorus was also detected. The Yongdam Reservoir is under the threat of recurrent eutrophication events that could jeopardize this vital drinking water facility due to increasing agricultural and anthropic activities.
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하천 어류군집에 기반한 생태학적 건강도 악화를 초래하는 대규모 보 건설의 영향
우스만아티크 ( Usman Atique ),마문MD ( Md Mamun ),남스라이자갈 ( Namsrai Jargal ),안광국 ( Kwang-guk An ) 한국환경생태학회 2021 한국환경생태학회 학술대회지 Vol.2021 No.2
Massive weirs installations in larger rivers could be strongly detrimental to the ecosystem services, water chemistry, and fish assemblages due to unpredicted hydrological modifications and new microhabitat features. This study highlighted the impact of three gigantic weirs erected in Geum River during 2010-2017 compared to the riverine zones from upstream to downstream. Nineteen water quality parameters were studied at 21 sites, while fish assemblages were investigated at 26 sites. The data evaluations included the application of index of biotic integrity (IBI), water pollution index (WPI), and principal component analysis (PCA). The results disclosed seasonal and spatial heterogeneities indicating gradual water quality degradation. TOC, ambient ratios (N:P), Chl-a, and conductivity are dissimilar, while BOD, COD, TSS, TP, and fecal coliforms are directly influenced by seasonal precipitation. Nutrients (N, P) exhibited week relationships in weirs (GW: R2 = 0.21, SW: R2 = 0.12, BW: R2 = 0.25), but stronger in the upstream zone (R2 = 0.74) of the river. WPI, however, designated the weirs and river zones into ‘fair to very poor’ water quality status. Likewise, the ecological health based on IBI specified sites into ‘fair to poor’ health. Overall, 60 fish species and 64637 fish individuals were observed, with 81.24% individuals observed at the weir sites, while Squalidus japonicus coreanus (18.47 % RA) and Hemibarbus labeo (9.25 % RA) were relatively the most abundant fish species sampled. The number of fish species and the total number of individuals gradually declined along the river gradient. PCA grouped the dominant factors in the different zones of the river with a percent cumulative variance 81.80%. The tolerant and omnivorous fish species confirmed aggregations at the downstream zone accompanied by increased insectivorous species. In conclusion, the impacts of weir installation manifested assiduously and indicted increasingly deteriorating water chemistry, gradually declining fish assemblages with jumbled distribution, perturbed microhabitat conditions, and inclusively deteriorating ecological health status.
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