Diel Oxygen Changes in Closed Ecological Systems; Predictive of Lake Metabolism?

Mapping Intimacies ◽

10.1101/2020.07.16.207522 ◽

2020 ◽

Author(s):

Frieda B. Taub ◽

David J. Bridges

Keyword(s):

Laboratory Study ◽

External Source ◽

Ecological Systems ◽

Net Ecosystem Production ◽

Zooplankton Grazing ◽

Aquatic Communities ◽

Lake Metabolism ◽

Metabolic Studies ◽

Natural Lakes ◽

Ecosystem Production

AbstractThe net oxygen change over a 24-hour day/night cycle in a laboratory study showed strong consistent patterns of (1) gain, when nutrients and light were available; (2) maintain, with daytime gains being matched by nighttime losses; and (3) loss, over brief periods of time during intense zooplankton grazing on previously grown phytoplankton or over long durations without an external source of nutrients. These were simplified aquatic communities closed to the atmosphere, Closed Ecological Systems (CES). Natural lakes are much more complex. While temperate lakes, having a winter accumulation of nutrients followed by sequential algal and zooplankton blooms, may show similar patterns, tropical and flood lakes may exhibit different patterns. Examination of archived lake metabolic studies could yield new insights while looking for these patterns by examining net ecosystem production (NEP), often measured as changes in oxygen concentrations.

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Influence of thermal stratification on seasonal net ecosystem production and dissolved inorganic carbon in a shallow subtropical lake

10.1002/essoar.10503432.1 ◽

2020 ◽

Author(s):

Hao-Chi Lin ◽

Chih-Yu Chiu ◽

Jeng-Wei Tsai ◽

Wen-Cheng Liu ◽

Kazufumi Tada ◽

...

Keyword(s):

Thermal Stratification ◽

Inorganic Carbon ◽

Dissolved Inorganic Carbon ◽

Net Ecosystem Production ◽

Subtropical Lake ◽

Ecosystem Production

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Net ecosystem production in a Spanish black pine forest after a low burn-severity fire: Significance of different modelling approaches for estimating gross primary production

Agricultural and Forest Meteorology ◽

10.1016/j.agrformet.2017.06.017 ◽

2017 ◽

Vol 246 ◽

pp. 178-193 ◽

Cited By ~ 3

Author(s):

E. Martínez-García ◽

E. Rubio ◽

F.A. García-Morote ◽

M. Andrés-Abellán ◽

H. Miettinen ◽

...

Keyword(s):

Primary Production ◽

Gross Primary Production ◽

Net Ecosystem Production ◽

Pine Forest ◽

Burn Severity ◽

Black Pine ◽

Ecosystem Production ◽

Modelling Approaches

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Consistent Effects of Canopy vs. Understory Nitrogen Addition on Soil Respiration and Net Ecosystem Production in Moso Bamboo Forests

Forests ◽

10.3390/f12101427 ◽

2021 ◽

Vol 12 (10) ◽

pp. 1427

Author(s):

Chunju Cai ◽

Zhihan Yang ◽

Liang Liu ◽

Yunsen Lai ◽

Junjie Lei ◽

...

Keyword(s):

Soil Respiration ◽

Carbon Cycling ◽

Forest Canopy ◽

Carbon Sink ◽

N Deposition ◽

Net Ecosystem Production ◽

Moso Bamboo ◽

Atmospheric N Deposition ◽

Ecosystem Carbon ◽

Ecosystem Production

Nitrogen (N) deposition has been well documented to cause substantial impacts on ecosystem carbon cycling. However, the majority studies of stimulating N deposition by direct N addition to forest floor have neglected some key ecological processes in forest canopy (e.g., N retention and absorption) and might not fully represent realistic atmospheric N deposition and its effects on ecosystem carbon cycling. In this study, we stimulated both canopy and understory N deposition (50 and 100 kg N ha−1 year−1) with a local atmospheric NHx:NOy ratio of 2.08:1, aiming to assess whether canopy and understory N deposition had similar effects on soil respiration (RS) and net ecosystem production (NEP) in Moso bamboo forests. Results showed that RS, soil autotrophic (RA), and heterotrophic respiration (RH) were 2971 ± 597, 1472 ± 579, and 1499 ± 56 g CO2 m−2 year−1 for sites without N deposition (CN0), respectively. Canopy and understory N deposition did not significantly affect RS, RA, and RH, and the effects of canopy and understory N deposition on these soil fluxes were similar. NEP was 1940 ± 826 g CO2 m−2 year−1 for CN0, which was a carbon sink, indicating that Moso bamboo forest the potential to play an important role alleviating global climate change. Meanwhile, the effects of canopy and understory N deposition on NEP were similar. These findings did not support the previous predictions postulating that understory N deposition would overestimate the effects of N deposition on carbon cycling. However, due to the limitation of short duration of N deposition, an increase in the duration of N deposition manipulation is urgent and essential to enhance our understanding of the role of canopy processes in ecosystem carbon fluxes in the future.

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