Water level as the key controlling regulator associated with nutrient and gross primary productivity changes in a large floodplain-lake system (Lake Poyang), China

Wang, Shuoyue; Gao, Yang; Jia, Junjie; Sun, Kun; Lyu, Sidan; Li, Zhaoxi; Lu, Yuexiang; Wen, Xuefa

doi:10.1016/j.jhydrol.2021.126414

Cited by 41 publications

(13 citation statements)

References 71 publications

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“…Our study revealed how the nutrient status of Changhu Lake varied depending on the uctuations in water level. Similar results have been obtained in other works where water levels also have a signi cant effect on nutrient status 11,33 . For example, Yang et al 11 demonstrated that WLFs can in uence cyanobacteria dynamics and cause an apparent switch between a turbid state and a clear state by modifying the nutrient loads and other limnological parameters in subtropical reservoirs.…”

Section: Discussionsupporting

confidence: 91%

“…This was counter to Wang et al 33 , who found an inverse relationship between water levels and the concentrations of NH 4 -N and dissolved TN. However, TP was signi cantly positively correlated to water levels, which was consistent with our results.…”

Section: Discussioncontrasting

confidence: 72%

“…For example, Yang et al 11 demonstrated that WLFs can in uence cyanobacteria dynamics and cause an apparent switch between a turbid state and a clear state by modifying the nutrient loads and other limnological parameters in subtropical reservoirs. Wang et al 33 found that water levels can signi cantly affect the nutrient status, phytoplankton growth, and gross primary productivity by indirectly in uencing the uctuations of water ow velocity and hydrological connectivity in Lake Poyang.…”

Section: Discussionmentioning

confidence: 99%

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Effects of extreme water levels on water quality in a large shallow eutrophic lake (Changhu Lake, China)

Wang

Yang

et al. 2021

Preprint

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Changhu Lake, a large shallow eutrophic lake in central China, experienced an extreme low water level event from November 2015 to January 2016 followed by an extreme high water level event in July 2016. In this study, we examined the effects of two extreme water levels on the nutrient status of Changhu Lake over five years. The nutrient concentrations in Changhu Lake showed significant interannual variations and the water quality of sites in the western part of Changhu Lake was better compared to sites at the outlet of the lake. In late 2015, the effect of low water levels led to a significant increase in nutrient concentrations. After July 2016, however, the high water level occurred leading to a marked decrease in nutrient concentrations. These changes in nutrient parameters were strongly related to the water level fluctuations. The dilution effect was the key process that determined the variations of nutrient parameters in Changhu Lake. As extreme water levels are likely to become more frequent during the twenty-first century, this work may provide some insights into the conservation and management of lake ecosystems in the face of climate change and human activity.

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Section: Discussionsupporting

confidence: 91%

Section: Discussioncontrasting

confidence: 72%

Section: Discussionmentioning

confidence: 99%

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Effects of extreme water levels on water quality in a large shallow eutrophic lake (Changhu Lake, China)

Wang

Yang

et al. 2021

Preprint

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“…The water level amplitude in floodplain systems significantly impacts the duration and timing of seasonal lake inundation, thereby playing a crucial role in the dominant biogeochemical cycle within these floodplains (Marks & Bates, 2000). Water level amplitudes vary across different floodplains worldwide (Paiva et al., 2013; Wang et al., 2021). For instance, the Amazon River and Mekong River can experience water level rises exceeding 10 m (de Paiva et al., 2013; Hung et al., 2012), whereas the European Danube and Rhine River floodplains can reach water level increases exceeding 5 m (Farago & Hangya, 2012; Reggiani & Weerts, 2008).…”

Section: Resultsmentioning

confidence: 99%

Effects of Periodic Fluctuation of Water Level on Solute Transport in Seasonal Lakes in Poyang Floodplain System

Chen,

Zhang,

Jin

et al. 2023

Water Resources Research

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Seasonal lakes appear in floodplain systems due to the seasonal variation of water level of rivers or main lakes and play an important ecological function. Previous studies have focused on exchange flux between the surface water and groundwater in seasonal lakes, but the process of solute transport at the sediment‐water interface under the effect of seasonal water level fluctuations remains unclear. In this study, laboratory flume experiments and numerical simulations were conducted to investigate non‐reactive solute transport and exchange in a seasonal lake under effects of hydrological connectivity, water level amplitude, sediment permeability and solute source. The results show that the recharge pattern between seasonal lakes and rivers or main lakes is determined by the seasonal water level. The solute transports from the groundwater of seasonal lakes to the main lake during the dry season, while the reverse applies during the wet season. The perennial hydrological isolation increases the concentration in the overlying water and pore water of the seasonal lake by 20.5% and 28.7%, respectively. The solute concentration in the overlying water and pore water of the seasonal lake decreases by 55.2% and 51.5%, respectively, when solute source occurs in the main lake compared with that occurs in the seasonal lake. The amplification of water level amplitudes leads to an increase of 6.46% and 10.55% in the solute concentration drop from the overlying water, respectively. These findings contribute to improving water resource utilization and protecting aquatic ecological environment in floodplain systems.

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“…During the low-water-level period, the eastern and western sublake systems are separated from the main lake and subsequently develop into relatively independent small lake systems (Figure ). The water level of Poyang Lake fluctuates between 7 and 21 m. The approximate water level during the high-water-level period is 18 m; the approximate water level during the intermediate-water-level periods (from March to July and from September to October) is 13 m; the approximate water level during the low-water-level period (from November to February of the following year) is 9 m …”

Section: Methodsmentioning

confidence: 99%

Water Conveyance-Type Lake Systems Shift toward Carbon Sources under Regulatory Balanced Water Level Metabolic Processes

Gao

Jia

et al. 2022

ACS Earth Space Chem.

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The water−air interface is the juncture whereby lake carbon (C) emissions are most active. However, the metabolic regulation of lake C exchange rates at the water−air interface remains unclear, especially for water conveyance-type lake systems that undergo dramatic alterations in water regimes. For the first time, underwater regime fluctuations. Findings show that the C exchange status at the water−air interface is regulated by the coupled connective effect of the water regime−water quality−GPP−pCO 2 effect. Compared to high-and low-water level periods, C emissions at the water−air interface were highest during the intermediate-water-level period. Moreover, this intermediate period was when this water conveyance-type lake system primarily converted basin-derived C inputs and discharged them into the atmosphere. This study also found that C emissions were most active when net ecosystem production (NEP) was close to 0. If NEP is too high (i.e., >6 g O 2 m −2 d −1 ) or too low (i.e., < −6 g O 2 m −2 d −1 ), the partial pressure of carbon dioxide (pCO 2 ) in water will be constrained either below or close to that of atmospheric pCO 2 .

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Water level as the key controlling regulator associated with nutrient and gross primary productivity changes in a large floodplain-lake system (Lake Poyang), China

Cited by 41 publications

References 71 publications

Effects of extreme water levels on water quality in a large shallow eutrophic lake (Changhu Lake, China)

Effects of extreme water levels on water quality in a large shallow eutrophic lake (Changhu Lake, China)

Effects of Periodic Fluctuation of Water Level on Solute Transport in Seasonal Lakes in Poyang Floodplain System

Water Conveyance-Type Lake Systems Shift toward Carbon Sources under Regulatory Balanced Water Level Metabolic Processes

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