scholarly journals Hypolimnetic oxygen depletion rates in deep lakes: Effects of trophic state and organic matter accumulation

2020 ◽  
Vol 65 (12) ◽  
pp. 3128-3138
Author(s):  
Thomas Steinsberger ◽  
Robert Schwefel ◽  
Alfred Wüest ◽  
Beat Müller
Keyword(s):  
Organic Matter ◽  
Trophic State ◽  
Oxygen Depletion ◽  
Deep Lakes ◽  
Organic Matter Accumulation ◽  
Hypolimnetic Oxygen

scholarly journals Relationship between areal hypolimnetic oxygen depletion rate and the trophic state of five lakes in northern Poland

2011 ◽  
Vol 11 (4) ◽  
pp. 135-142 ◽  
Author(s):  
Dariusz Borowiak ◽  
Kamil Nowiński ◽  
Jacek Barańczuk ◽  
Włodzimierz Marszelewski ◽  
Rajmund Skowron ◽  
...  
Keyword(s):  
Total Nitrogen ◽  
Trophic State ◽  
Oxygen Depletion ◽  
Water Transparency ◽  
Morphological Data ◽  
Lake Productivity ◽  
Stratified Lakes ◽  
Northern Poland ◽  
Hypolimnetic Oxygen ◽  
Depletion Rate

Relationship between areal hypolimnetic oxygen depletion rate and the trophic state of five lakes in northern PolandThe oxygen content in a lake is a fundamental factor in lake ecology. In stratified lakes, deep waters are isolated from the atmosphere for several months during the summer; therefore, oxygen (substantially consumed by biological and chemical processes at this time) cannot be replaced before the autumnal mixing period. Hypolimnetic oxygen depletion has been considered an indicator of lake productivity since the early twentieth century. Many recent studies have been in opposition to this view by showing that the areal hypolimnetic oxygen depletion rate (AHOD) is poorly correlated with seston biomass and/or phosphorus concentration. The objective of this study is to show relationships between the mean values of total phosphorus (TP), total nitrogen (TN), chlorophyll a, and water transparency (Secchi disk depth, SDD) during the thermal stratification formation period and the AHOD rate. Hypolimnetic oxygen conditions in five dimictic lakes in northern Poland were examined in 2009 and 2010. Two of them were studied in the previous year. Monthly oxygen profiles taken from April to August, midsummer temperature profiles, and morphological data of the lakes were used to determine the AHOD rate. Standard water quality parameters such as concentrations of chlorophyll a, TP, and TN, as well as water transparency measured at the same time were used to calculate the trophic state indices (TSI) according to the Carlson-type formulas. On the basis of the collected data it is shown that AHOD is highly correlated with the TSI value for chlorophyll a, and poorly correlated with the TSI values for water transparency and phosphorus content. The best correlation between AHOD and TSI has been found for chlorophyll a (r2=0.702; p<0.001), as well as for overall TSI, determined by averaging separate component indices (r2=0.826; p<0.000). No correlation was found between AHOD and total nitrogen concentration. The research also confirmed previous observations, which pointed to a significant role of the hypolimnion depth in increasing oxygen deficits.

Oxygen Depletion in the Central and Eastern Basins of Lake Erie, 1970

1976 ◽  
Vol 33 (3) ◽  
pp. 512-519 ◽  
Author(s):  
N. M. Burns
Keyword(s):  
Hydrodynamic Model ◽  
Lake Erie ◽  
Trophic State ◽  
Oxygen Depletion ◽  
Eastern Basin ◽  
Hypolimnetic Oxygen ◽  
Depletion Rate

The hypolimnetic oxygen depletion rate is required to be measured to an accuracy of approximately 3% if major changes in the trophic state of Lake Erie are to be documented within about 5 yr of the change commencing. Depletion rate measurements of this level of accuracy require a knowledge of the reoxygenation of the Central and Eastern basin hypolimnia and the transport of oxygen between the hypolimnia. A model is described here that enables an estimate of the degree of hypolimnetic reoxygenation to be made. The transport of oxygen between the hypolimnia was estimated by means of a hydrodynamic model. The resultant calculations gave areal hypolimnetic depletion rate values of 0.43 and 0.87 g O2 m−2 day−1 for the Central and Eastern basins, respectively, and volumetric depletion rates of 0.13 and 0.057 g O2 m−3 day−1, respectively, for these basins during 1970.

Oxidases and hydrolases mediate soil organic matter accumulation in chernozem of northeastern China

Geoderma ◽  
2021 ◽  
Vol 403 ◽  
pp. 115206
Author(s):  
Guohui Wu ◽  
Zhenhua Chen ◽  
Dongqi Jiang ◽  
Nan Jiang ◽  
Hui Jiang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Northeastern China ◽  
Organic Matter Accumulation
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