Loading of phosphorus and nitrogen to Lake Waco, Texas

Wagner, Kenneth J.

doi:10.1080/07438141.2010.499095

Cited by 9 publications

(2 citation statements)

References 18 publications

(21 reference statements)

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“…An upward shift in the TN:TP ratio of outflow, relative to the inflow, has been reported for over 30 reservoirs (Ashton, 1981;Burford et al, 2012;Cook et al, 2010;Gasparini et al, 2011;Grantz et al, 2014;Hart et al, 2002;Molisani et al, 2013;Ramírez-Zierold et al, 2010;Vanni et al, 2011;Wagner, 2010). A good example is provided by the dammed rivers that feed into Lake Winnipeg, Canada.…”

Section: Global Biogeochemical Cyclesmentioning

confidence: 99%

Effects of Damming on River Nitrogen Fluxes: A Global Analysis

Akbarzadeh

Maavara

Slowinski

et al. 2019

Global Biogeochemical Cycles

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Damming creates biogeochemical hotspots along rivers that modify the riverine flow of nutrients, including nitrogen (N). Here, we quantify the impact of dams on global riverine N fluxes using a reservoir N mass balance model. In-reservoir processes represented in the model include primary production, mineralization of organic N, denitrification, and sedimentary burial. In addition, we explicitly account for N fixation as a source of N, assuming that the N to phosphorus (P) ratio of the inflow regulates the magnitude of N fixation in reservoirs. The model is scaled up via a Monte Carlo analysis that yields global relationships between N elimination in reservoirs, either by denitrification or burial, and the hydraulic residence time. These relationships are then combined with N loads to the world's dam reservoirs generated by the Global-NEWS model and the estimated N fixation fluxes. According to the results, in year 2000, worldwide N fixation in reservoirs was on the order of 70 Gmol yr −1 , while denitrification and burial in reservoirs eliminated around 270 Gmol yr −1 , equal to 7% of N loading to the global river network. The latter is predicted to double to 14% by 2030, mainly as a result of the current boom in dam building. The results further imply that, largely due to N fixation in reservoirs, damming causes a global upward shift in riverine N:P ratios, thus lessening N limitation in receiving water bodies.

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Section: Global Biogeochemical Cyclesmentioning

confidence: 99%

Effects of Damming on River Nitrogen Fluxes: A Global Analysis

Akbarzadeh

Maavara

Slowinski

et al. 2019

Global Biogeochemical Cycles

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“…It was found that dissimilatory nitrate reduction to ammonium and dissimilatory nitrate reduction to nitrite were important mechanisms for retaining bioavailable fixed N as NH 4 + or NO 2 in Florida Bay, especially in summer. Wagner (2010) calculated the loading of nitrogen and phosphorus from various pollution sources and provided feasible measures to reduce nutrient contents in Lake Waco. In addition, several evaluation methods have been used to assess lake eutrophication, such as ecological risk assessment method (Wang et al, 2008), the synthesized trophic state index model (Yu et al, 2010) etc.…”

Section: Introductionmentioning

confidence: 99%

Temporal and spatial variations of nutrients in Baiyangdian Lake, North China

Zhao

Xia²,

Yang³

et al. 2011

J ENV INFORM

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Baiyangdian Lake is the largest shallow freshwater body in the North China Plain. In this study, the spatial and temporal variations of nutrients have been studied based on the monthly data of eight state monitoring stations from 2000 to 2009. The results showed that: (1) Total phosphorus and total nitrogen were major pollutants in Baiyangdian Lake. The synthesized trophic state index indicated that the lake was in eutrophic or supereutrophic state. (2) Total phosphorus concentrations were higher in summer and autumn, and total nitrogen concentrations were higher in autumn and winter for most years from 2000 to 2009. Inter-annual water quality analysis showed that Baiyangdian Lake was seriously polluted in 2006, and the water quality in 2009 was the best in recent decade. (3) The water quality in the west of the lake was worse than that in eastern section, which caused by the point source pollution. In addition, nitrogen and phosphorus from non-point source might enter the lake through domestic sewage, the wastes and animal husbandry from the villages in the lake. ( 4) Variations of water level were influenced by both precipitation and water recharges. Total phosphorus concentrations in the lake were negatively correlated with water levels for most years, inferring that the dilution effects of water recharges could relieve water pollution in Baiyangdian Lake. This study suggested that the integrated management of water resources should focus on both pollution source control and water recharge regulations.

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The LTAR Cropland Common Experiment at the Texas Gulf

Yost,

Smith,

Adhikari

et al. 2024

J of Env Quality

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Texas Gulf is one of the 18 regional sites that is part of the USDA‐ARS Long‐Term Agroecosystem Research (LTAR) Network and focuses on cropland and integrated grazing land research in Central Texas, addressing challenges posed by soil characteristics, climate variability, and urbanization. This paper provides brief site descriptions of the two Cropland Common Experiments being conducted in the Texas Gulf LTAR region, emphasizing conservation tillage practices and precision agriculture techniques. The plot‐scale study is located in Temple, TX, at the USDA‐ARS Grassland, Soil and Water Research Laboratory and examines conventional tillage, strip tillage, and no tillage practices. The field‐scale study, located in Riesel, TX, at the USDA‐ARS Riesel Watersheds, assesses the impact of no tillage, cover crops, fertility management, adaptive management, and precision conservation on crop yield, profitability, and environmental footprint. Key measurements include soil and plant analyses, greenhouse gas fluxes, runoff water quantity and quality, and field operations recorded with precision agriculture equipment. Despite challenges posed by urban encroachment, future research aims to incorporate new technologies, such as unmanned ground vehicles, to enhance sustainability and productivity of the agricultural landscape. These experiments provide valuable insights for stakeholders, contributing to the development of sustainable agricultural practices tailored to the unique challenges within the Texas Gulf LTAR region.

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Loading of phosphorus and nitrogen to Lake Waco, Texas

Cited by 9 publications

References 18 publications

Effects of Damming on River Nitrogen Fluxes: A Global Analysis

Effects of Damming on River Nitrogen Fluxes: A Global Analysis

Temporal and spatial variations of nutrients in Baiyangdian Lake, North China

The LTAR Cropland Common Experiment at the Texas Gulf

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