Respiration rate of arctic plants as related to the production process

Semikhatova, O. A.; Иванова, Т. И.; Kirpichnikova, O. V.

doi:10.1134/s1021443709030029

Cited by 11 publications

(3 citation statements)

References 10 publications

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“…It remains unclear what might cause this uptake in winter. Some studies (e.g., Semikhatova et al., 2009; Starr & Oberbauer, 2003) have linked CO 2 uptake in the non‐growing season with the photosynthetic activities of evergreen plants and soil crust plants (Starr & Oberbauer, 2003). In this study, we have taken a conservative approach and consider the CO 2 uptake in winter to be negligible.…”

Section: Discussionmentioning

confidence: 99%

Warming and Increased Respiration Have Transformed an Alpine Steppe Ecosystem on the Tibetan Plateau From a Carbon Dioxide Sink Into a Source

et al. 2021

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Cold region ecosystems store vast amounts of soil organic carbon (C), which upon warming and decomposition can affect the C balance and potentially change these ecosystems from C sinks to carbon dioxide (CO 2 ) sources. We quantified the decadal year-round CO 2 flux from an alpine steppe-ecosystem on the Tibetan Plateau using eddy covariance and automatic chamber approaches during a period of significant warming (0.13°C per 10 years; and 0.18°C in the non-growing season alone: 1st October to next 30th April). The results showed that ongoing climate change, mainly warming within the topsoil layers, is the main reason for the site's change from a sink for to a source of CO 2 in the atmosphere. Non-growing-season ecosystem respiration accounted for 51% of the annual ecosystem respiration and has increased significantly. The growing seasons (1st May to 30th September) were consistent CO 2 sink periods without significant changes over the study period. Observations revealed high-emission events from the end of the non-growing season to early in the growing season (1st March to fifteenth May), which significantly (p < 0.01) increased at a rate of 22.6 g C m −2 decade −1 , ranging from 14.6 ± 10.7 g C m −2 yr −1 in 2012 to 35.3 ± 12.1 g C m −2 yr −1 in 2017. Structural equation modeling suggested that active layer warming was the key factor in explaining changes in ecosystem respiration, leading to significant changes in net ecosystem exchange over the period 2011-2020 and indicated that these changes have already transformed the ecosystem from a CO 2 sink into a source. These results can be used to improve our understanding of the sensitivity of ecosystem respiration to increased warming during the non-growing period.Plain Language Summary Cold region ecosystems store vast amounts of soil organic carbon (SOC), which upon warming and decomposition can affect the net carbon balance and potentially change these ecosystems to become a source of carbon dioxide (CO 2 ) to the atmosphere. We have measured year-round CO 2 fluxes over 10 years from an alpine steppe-ecosystem on the Tibetan Plateau. The results show that the region has experienced pronounced warming during the study period and that the resulting near-surface soil warming is a key parameter for explain why the ecosystem over 10 years have changed from being a net sink to become a net source of CO 2 to the atmosphere. Measurements year-round demonstrate that the shift in the CO 2 balance is mainly due to a marked increase in decomposition of SOC during the non-growing-season. Furthermore, observations reveal several high-emission events at the end of the non-growing season and early in the growing season, which have increased in importance during the study period. The results are important to improve our understanding of the sensitivity of cold ecosystem respiration to warming and to highlight the importance of winter processes and emissions events on the annual ecosystem carbon budget. YUN ET AL.

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Section: Discussionmentioning

confidence: 99%

Warming and Increased Respiration Have Transformed an Alpine Steppe Ecosystem on the Tibetan Plateau From a Carbon Dioxide Sink Into a Source

et al. 2021

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“…It is known that in fast growing tissues only 20% of respiratory energy is stored in new biomass. The other part of energy is lost as heat, but 90% of that heat is a result of energy produced by catabolism (Semikhatova 1990). If electrons are transferred to the alternative pathway, no protons are pumped and the energy of the reductants is converted to heat.…”

Section: Discussionmentioning

confidence: 99%

Developmental changes in energy dissipation in etiolated wheat seedlings during the greening process

et al. 2013

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We studied the developmental changes in photosynthetic and respiration rates and thermal dissipation processes connected with chloroplasts and mitochondria activity in etiolated wheat (Triticum aestivum L., var. Irgina) seedlings during the greening process. Etioplasts gradually developed into mature chloroplasts under continuous light [190 µmol(photon) m -2 s -1 ] for 48 h in 5-day-dark-grown seedlings. The net photosynthetic rate of irradiated leaves became positive after 6 h of illumination and increased further. The first two hours of de-etiolation were characterized by low values of maximum (F v /F m ) and actual photochemical efficiency of photosystem II (PSII) and by a coefficient of photochemical quenching in leaves. F v /F m reached 0.8 by the end of 24 h-light period. During greening, energydependent component of nonphotochemical quenching of chlorophyll fluorescence, violaxanthin cycle (VXC) operation, and lipoperoxidation activity changed in a similar way. Values of these parameters were the highest at the later phase of de-etiolation (4-12 h of illumination). The respiration rate increased significantly after 2 h of greening and it was the highest after 4-6 h of illumination. It was caused by an increase in alternative respiration (AP) capacity. The strong, positive linear correlation was revealed between AP capacity and heat production in greening tissues. These results indicated that VXC in chloroplasts and AP in mitochondria were intensified as energy-dissipating systems at the later stage of greening (after 4 h), when most of prolamellar bodies converted into thylakoids, and they showed the greatest activity until the photosynthetic machinery was almost completely developed.

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“…Increase soil temperature can also increase vegetative GPP by increasing the belowground carbon sink of photosynthetic assimilates (Baldocchi et al 2001;Pumpanen et al 2012). Plant and root respiration, which account, a major portion of RE of ecosystems are affected by temperature and growth stage of the plant (Semikhatova et al 2009). The RE accounts about 33% of GPP under high light conditions and this relationship varies over seasons as soil and air temperature as well as change in plant phenology (Bubier et al 1998).…”

Section: In Uence Of Metrological Variables On Neementioning

confidence: 99%

Environmental Control of Inter-annual Variability of Net Ecosystem Exchange in Rice-rice Cropping System

Swain

Nayak

Chatterjee

et al. 2021

Preprint

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Consecutive five-year long eddy covariance measurements in a lowland tropical rice-rice system were used to investigate the impacts of gross primary productivity (GPP), climate drivers and ecosystem responses (i.e. ecosystem respiration, RE) on the inter-annual variability (IAV) of the net ecosystem exchange (NEE), which is directly related to the agricultural productivity and climate change. The IAV of carbon dioxide fluxes in two crop growing phases i.e. dry and wet season along with fallow period were analysed. The respiratory fluxes build up during the non-growing season were lower by net uptake in growing season. Annual cumulative value of NEE was negative (sink) in both the crop growing season. The variability of climate drivers and changes in the ecosystem responses to drivers revealed a large intra-annual as well as inter-annual variability of net ecosystem fluxes. NEE was found to be strongly correlated with GPP and RE and also with other metrological variables such as photosynthetically active radiation (PAR), precipitation, air temperature and soil temperature. The anomalies of NEE, GPP and RE were observed to be less in 2017 and 2018 which may be due to lower temperature anomalies recorded in these years. Further understanding of biological mechanisms is needed which is involved in the variation of climatological variables to improve our ability to predict future IAV of NEE.

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Respiration rate of arctic plants as related to the production process

Cited by 11 publications

References 10 publications

Warming and Increased Respiration Have Transformed an Alpine Steppe Ecosystem on the Tibetan Plateau From a Carbon Dioxide Sink Into a Source

Warming and Increased Respiration Have Transformed an Alpine Steppe Ecosystem on the Tibetan Plateau From a Carbon Dioxide Sink Into a Source

Developmental changes in energy dissipation in etiolated wheat seedlings during the greening process

Environmental Control of Inter-annual Variability of Net Ecosystem Exchange in Rice-rice Cropping System

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