Variation in Peak Growing Season Net Ecosystem Production Across the Canadian Arctic

In order to understand the effect of phytotoxic tropospheric ozone (O3) on terrestrial vegetation, we quantified the impact of current O3 concentration ([O3]) on net ecosystem production (NEP) when compared to the conditions of the pre-industrial era. We compared and tested linear mixed-effects models based on [O3] and stomatal O3 flux (Fsto). The managed ryegrass–clover (Lolium perenne and Trifolium pratense) mixture was grown on arable land in the Czech Republic, Central Europe. Values of [O3] and Fsto were measured and calculated based on resistance analogy, respectively, while NEP was calculated from eddy covariance CO2 fluxes. We found the Fsto-based model more precise when compared to measured NEP. High Fsto was found even at low [O3], while broad summer maximum of [O3] was not necessarily followed by significant NEP decline, due to low soil water content leading to a low stomatal conductivity and Fsto. Comparing to low pre-industrial O3 conditions, current levels of O3 resulted in the reduction of cumulative NEP over the entire growing season, up to 29.7 and 13.5% when the [O3]-based and Fsto-based model was applied, respectively. During the growing season, an O3-induced reduction of NEP ranged between 13.1% in May and 26.2% in July when compared to pre-industrial Fsto levels. Looking to the future, high [O3] and Fsto may lead to the reduction of current NEP by approximately 13.3% on average during the growing season, but may increase by up to 61–86.6% in autumn, indicating further O3-induced acceleration of the senescence. These findings indicate the importance of Fsto and its inclusion into the models estimating O3 effects on terrestrial vegetation. The interaction between environmental factors and stomatal conductance is therefore discussed in detail.

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Analyzing the Effects of Growing Season Length on the Net Ecosystem Production of an Alpine Grassland Using Model–Data Fusion

Ecosystems ◽

10.1007/s10021-017-0201-5 ◽

2017 ◽

Vol 21 (5) ◽

pp. 982-999 ◽

Cited By ~ 8

Author(s):

Katharina Scholz ◽

Albin Hammerle ◽

Erika Hiltbrunner ◽

Georg Wohlfahrt

Keyword(s):

Data Fusion ◽

Growing Season ◽

Net Ecosystem Production ◽

Alpine Grassland ◽

Season Length ◽

Model Data ◽

Growing Season Length ◽

Ecosystem Production

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Forest Ecosystem as a Source of Co2 During Growing Season: Relation to Weather Conditions

International Agrophysics ◽

10.2478/intag-2014-0013 ◽

2014 ◽

Vol 28 (2) ◽

pp. 239-249 ◽

Cited By ~ 2

Author(s):

Klára Taufarová ◽

Kateřina Havránková ◽

Alice Dvorská ◽

Marian Pavelka ◽

Marek Urbaniak ◽

...

Keyword(s):

Weather Conditions ◽

Growing Season ◽

Net Ecosystem Production ◽

Weather Extremes ◽

Eddy Covariance Method ◽

Growing Seasons ◽

Ecosystem Production ◽

Hot Days ◽

Carbon Balances ◽

Co2 Release

Abstract Net ecosystem production reflects the potential of the ecosystem to sequestrate atmospheric CO2. Daily net ecosystem production of a mountain Norway spruce forest of the temperate zone (Czech Republic) was determined using the eddy covariance method. Growing season days when the ecosystem was a CO2 source were examined with respect to current weather conditions. During the 2005, 2006, and 2007 growing seasons, there were 44, 65, and 39 days, respectively, when the forest was a net CO2 source. The current weather conditions associated with CO2 release during the growing seasons were: cool and overcast conditions at the beginning or end of the growing seasons characterized by a 3-year mean net ecosystem production of -7.2 kg C ha-1 day-1; overcast or/and rainy days (-23.1 kg C ha-1 day-1); partly cloudy and hot days (-11.8 kg C ha-1 day-1); and overcast and hot days (-13.5 kg C ha-1 day-1). CO2 release was the highest during the overcast or/and rainy conditions (84%, average from all years), which had the greatest impact during the major production periods. As forests are important CO2 sinks and more frequent weather extremes are expected due to climate change, it is important to predict future forest carbon balances to study the influence of heightened variability in climatic variables.

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Reevaluating growing season length controls on net ecosystem production in evergreen conifer forests

Scientific Reports ◽

10.1038/s41598-018-36065-0 ◽

2018 ◽

Vol 8 (1) ◽

Cited By ~ 6

Author(s):

David M. Barnard ◽

John F. Knowles ◽

Holly R. Barnard ◽

Michael L. Goulden ◽

Jia Hu ◽

...

Keyword(s):

Growing Season ◽

Net Ecosystem Production ◽

Conifer Forests ◽

Season Length ◽

Growing Season Length ◽

Ecosystem Production ◽

Evergreen Conifer

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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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