Relationship between soil respiration and soil moisture

Orchard, Valerie A.; Cook, F. J.

doi:10.1016/0038-0717(83)90010-x

Cited by 666 publications

(378 citation statements)

References 31 publications

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“…Bacterial respiration is severely restricted below -1.5 MPa, whereas root and saprophytic fungi respiration is less affected. Fungi respiration remains quite constant till -2 MPa [31,50]. Coarse root respiration is not affected by our treatment as the volume of soil submitted to water stress imposed in the experimental plot is much smaller than the volume of soil exploited by these roots.…”

Section: Discussionmentioning

confidence: 84%

The key-role of topsoil moisture on CO₂ efflux from a Mediterranean Quercus ilex forest

et al. 2003

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-CO 2 respiratory losses partly determine net carbon ecosystem exchanges. The main objective of this paper was to understand regulation imposed by soil water content and temperature on soil and ecosystem CO 2 efflux in a holm oak (Quercus ilex L.) Mediterranean forest. Soil CO 2 efflux was monitored monthly during 1999 and 2001. Moreover, experimental water treatments were conducted in 1999 over 9 small plots (0.3 m 2 ) during nine months. Results showed strong decreases of soil CO 2 efflux for a relative soil water content below 0.7. Ecosystem respiration measured by eddy covariance over a 4-year period showed strong sensitivity to soil water content and temperature. Severe limitations of soil and ecosystem efflux imposed by low values of soil water content occurred on about 90 days per year. The best adjustments of soil and ecosystem CO 2 efflux were obtained using regression models where the exponential effect of temperature is linearly related to soil water content (r 2 = 0.68 and 0.79 for soil and ecosystem respectively). Our results highlighted strong differences in respiration sensitivity to topsoil moisture between soil and ecosystem. When the relative water content (RWC) is low (0.4), an increase of 1°C provokes an increase of soil respiration of 5.7% and an increase of ecosystem respiration of 8.6%. For nonlimiting soil water conditions, at RWC = 1, the increases of respiration caused by a 1°C temperature increase are of 8.5% and 16.5% for soil and ecosystem respectively. These results emphasized the probable determinant influences of changes in soil water regime for respiratory fluxes and net carbon exchanges of Mediterranean forest ecosystems.CO 2 efflux / soil water content / soil temperature / ecosystem respiration / Mediterranean ecosystem / Quercus ilex Résumé -Le rôle-clé de l'humidité du sol superficiel sur les efflux de CO 2 d'une forêt méditerranéenne de chêne vert. Les pertes de CO 2 par respiration vont déterminer largement les échanges nets de carbone des écosystèmes. L'objectif principal de cet article est de comprendre les régulations imposées par la teneur en eau et la température du sol sur les efflux de CO 2 du sol et de l'écosystème dans une forêt méditerranéenne de chêne vert (Quercus ilex L.). La respiration du sol a été mesurée mensuellement en 1999 et 2001. Par ailleurs, une expérimentation, mise en place en 1999, comprenant trois régimes hydriques a été suivie pendant 9 mois sur 9 parcelles de 0.3 m 2 . Les résultats mettent en évidence la très forte limitation des efflux lorsque la teneur en eau du sol est inférieure à 70 % de sa capacité de rétention. La respiration de l'écosystème mesurée sur une période de 4 ans par la méthode des fluctuations turbulentes montre la même sensibilité aux deux facteurs. Les conditions de fortes limitations par une faible teneur en eau du sol affectent l'écosystème environ 90 jours par an. Les meilleurs ajustements pour la simulation des flux de CO 2 du sol et de l'écosystème sont obtenus pour un modèle dans lequel l'effet exponentiel d...

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Section: Discussionmentioning

confidence: 84%

The key-role of topsoil moisture on CO₂ efflux from a Mediterranean Quercus ilex forest

et al. 2003

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“…the amount of water that is needed for microbial activity), may be better described as dry soils rather than marine sediments. In such low water potential environments several microorganisms are known to be metabolically--active (Orchard & Cook 1983) and thus their occurrence in DHAB sediments cannot be excluded.…”

Section: Methodsmentioning

confidence: 99%

Inter-comparison of the potentially active prokaryotic communities in the halocline sediments of Mediterranean deep-sea hypersaline basins

et al. 2015

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The sediment microbiota of the Mediterranean deep--sea anoxic hypersaline basins (DHABs) are understudied relative to communities in the brines and halocline waters. In this study, the active fraction of the prokaryotic community in the halocline sediments of L' Atalante, Urania and Discovery DHABs was investigated based on extracted total RNA and 454 pyrosequencing of the 16S rRNA gene. Bacterial and archaeal communities were different in the sediments underlying the halocline waters of the three habitats, reflecting the unique chemical settings of each basin. The relative abundance of unique operational taxonomic units (OTUs) was also different between deep--sea control sediments and sediments underlying DHAB haloclines, suggesting adaptation to the steep DHAB chemical gradients. Only a few OTUs were affiliated to known bacterial halophilic and/or aerobic groups. Many OTUs, including some of the dominant ones, were related to aerobic taxa. Archaea were detected only in few halocline samples, with lower OTU richness relative to Bacteria, and were dominated by taxa associated with methane cycling. This study suggests that while metabolically active prokaryotic communities appear to be present in sediments underlying the three DHABs investigated, their diversity and activity are likely to be more reduced in sediments underlying the brines.3

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“…The sustained rates of respiration after rain were not due to prolonged physical displacement of air by the rain. Both laboratory experiments (Birch, 1958; Griffiths and Birch, 1961;Orchard and Cook, 1983) and field measurements (Liu et al, 2002;Rey et al, 2002) show that microbial respiration is able to turn on quickly (within hours) with the addition of water, and respiration rate ceases as soon as the soil layer dries. Fig.…”

Section: Influence Of Rain Events On R Ecomentioning

confidence: 99%

Seasonal variation in carbon dioxide exchange over a Mediterranean annual grassland in California

Baldocchi

2004

Agricultural and Forest Meteorology

540

350

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Understanding how environmental variables affect the processes that regulate the carbon flux over grassland is critical for large-scale modeling research, since grasslands comprise almost one-third of the earth's natural vegetation. To address this issue, fluxes of CO 2 (F c , flux toward the surface is negative) were measured over a Mediterranean, annual grassland in California, USA for 2 years with the eddy covariance method.To interpret the biotic and abiotic factors that modulate F c over the course of a year we decomposed net ecosystem CO 2 exchange into its constituent components, ecosystem respiration (R eco ) and gross primary production (GPP). Daytime R eco was extrapolated from the relationship between temperature and nighttime F c under high turbulent conditions. Then, GPP was estimated by subtracting daytime values of F c from daytime estimates of R eco .Results show that most of carbon exchange, both photosynthesis and respiration, was limited to the wet season (typically from October to mid-May). Seasonal variations in GPP followed closely to changes in leaf area index, which in turn was governed by soil moisture, available sunlight and the timing of the last frost. In general, R eco was an exponential function of soil temperature, but with season-dependent values of Q 10 . The temperature-dependent respiration model failed immediately after rain events, when large pulses of R eco were observed. Respiration pulses were especially notable during the dry season when the grass was dead and were the consequence of quickly stimulated microbial activity.Integrated values of GPP, R eco , and net ecosystem exchange (NEE) were 867, 735, and −132 g C m −2 , respectively, for the 2000-2001 season, and 729, 758, and 29 g C m −2 for the 2001-2002 season. Thus, the grassland was a moderate carbon sink during the first season and a weak carbon source during the second season. In contrast to a well-accepted view that annual production of grass is linearly correlated to precipitation, the large difference in GPP between the two seasons were not caused by the annual precipitation. Instead, a shorter growing season, due to late start of the rainy season, was mainly responsible for the lower GPP in the second season. Furthermore, relatively higher R eco during the non-growing season occurred after a late spring rain. Thus, for this Mediterranean grassland, the timing of rain events had more impact than the total amount of precipitation on ecosystem GPP and NEE. This is because its growing season is in the cool and wet season when carbon uptake and respiration are usually limited by low temperature and sometimes frost, not by soil moisture.

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Relationship between soil respiration and soil moisture

Cited by 666 publications

References 31 publications

The key-role of topsoil moisture on CO₂ efflux from a Mediterranean Quercus ilex forest

The key-role of topsoil moisture on CO₂ efflux from a Mediterranean Quercus ilex forest

Inter-comparison of the potentially active prokaryotic communities in the halocline sediments of Mediterranean deep-sea hypersaline basins

Seasonal variation in carbon dioxide exchange over a Mediterranean annual grassland in California

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Relationship between soil respiration and soil moisture

Cited by 666 publications

References 31 publications

The key-role of topsoil moisture on CO2 efflux from a Mediterranean Quercus ilex forest

The key-role of topsoil moisture on CO2 efflux from a Mediterranean Quercus ilex forest

Inter-comparison of the potentially active prokaryotic communities in the halocline sediments of Mediterranean deep-sea hypersaline basins

Seasonal variation in carbon dioxide exchange over a Mediterranean annual grassland in California

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The key-role of topsoil moisture on CO₂ efflux from a Mediterranean Quercus ilex forest

The key-role of topsoil moisture on CO₂ efflux from a Mediterranean Quercus ilex forest