Ecosystem respiration in two Mediterranean evergreen Holm Oak forests: drought effects and decomposition dynamics

Reichstein, Markus; Tenhunen, John; Roupsard, Olivier; Ourcival, Jean‐Marc; Rambal, Serge; Dore, Sabina; Валентини, Р.

doi:10.1046/j.0269-8463.2001.00597.x

Cited by 294 publications

(226 citation statements)

References 62 publications

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“…Moreover, such kinds of function relationship failed when air temperature was higher than 28 • C, accompanying with relatively lower soil moisture. The average of soil water content was 0.125 m 3 m −3 when air temperature was above 28 • C. Similarly, RE is an exponential function of air or soil temperature, with rates further modulated by soil moisture (Reichstein et al, 2002;Powell et al, 2008). In addition, the response of monthly GEP, RE and NEP to vapor pressure deficit was similar to that of air temperature (data are not shown).…”

Section: Seasonality and Interannual Variability Of Gep Re And Nepmentioning

confidence: 66%

“…The variation of NEP is complex, because NEP integrates two interactive processes, GEP and RE, both of which respond independently to climate (e.g. Reichstein et al, 2002;Barr et al, 2007). RE is controlled by temperature, soil water content and substrate availability (including recent photosynthetic assimilates; it is coupled to GEP), while GEP is mainly controlled by radiation, air temperature, water vapor deficit, the water amount of root uptake, the amount of leaves in the canopy (leaf area index) and the distribution and function of these leaves in different parts of the canopy (e.g.…”

Section: Effects Of Drought On Gep Re and Nepmentioning

confidence: 99%

“…The nighttime NEP was defined as nighttime ecosystem respiration (RE night , mg CO 2 m −2 s −1 ). The missing RE night were estimated as a function of soil temperature and soil moisture with a yearly interval (Reichstein et al, 2002),…”

Section: Gap Filling and Flux Partitioningmentioning

confidence: 99%

“…Although not as commonly recognized, it is evident that ecosystem water balances are changing due to altered rainfall and evaporation patterns (Rambal and Debussche, 1995; Correspondence to: X.-M. Sun (sunxm@igsnrr.ac.cn) Waple and Lawrimore, 2003;Reichstein et al, 2007). Enhanced drought may not only result from low annual rainfall, but more likely from a different rainfall distribution (Rambal and Debussche, 1995).…”

Section: Introductionmentioning

confidence: 99%

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Ecosystem carbon exchanges of a subtropical evergreen coniferous plantation subjected to seasonal drought, 2003–2007

et al. 2010

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Abstract. The behavior of whole ecosystems in humid climate zone in response to drought is less well documented. Continuous measurements of carbon dioxide and water vapor exchange using the eddy covariance technique during 2003-2007 were made above a subtropical evergreen coniferous plantation in Southeast China. Seasonal distribution of precipitation and temperature was inconsistent during the summer, which resulted in droughts frequently. Gross ecosystem photosynthesis (GEP), ecosystem respiration (RE) and net ecosystem production (NEP) showed clear seasonality, with low rates during droughts and in winter. With statistical significance, the monthly GEP and RE increased exponentially with air temperature, but the monthly NEP was less sensitive and only increased linearly with air temperature. However, the function response of monthly NEP and its components (GEP and RE) disappeared under high temperature and low soil moisture. Monthly and yearly RE showed a statistically linear and positive dependence on the corresponding GEP. Annual NEP varied among years from 306 to 430 g C m −2 (mean 395, SD 50). Interannual variability in NEP was controlled primarily by air temperature and the ratio of precipitation and evapotranspiration that affected the RE/GEP ratio, which varied between 0.76 and 0.81 (mean 0.78, SD 0.02).

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Section: Seasonality and Interannual Variability Of Gep Re And Nepmentioning

confidence: 66%

Section: Effects Of Drought On Gep Re and Nepmentioning

confidence: 99%

Section: Gap Filling and Flux Partitioningmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ecosystem carbon exchanges of a subtropical evergreen coniferous plantation subjected to seasonal drought, 2003–2007

et al. 2010

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“…Since soil moisture was reported to limit the rate of respiration at drought or severe drought regions through affecting the accessibility of respiratory substrate and the activity of relevant biological enzymes (Reichstein et al, 2002;Rey et al, 2002;Davidson and Janssens, 2006;Matías et al, 2012), we developed a variant of Eq. (8) with W s multiplying the R EOM part.…”

Section: Description Of the Rersmmentioning

confidence: 99%

A remote sensing model to estimate ecosystem respiration in Northern China and the Tibetan Plateau

Gao

et al. 2015

Ecological Modelling

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a b s t r a c tEcosystem respiration (R e ) is rarely quantified from remote sensing data because satellite technique is incapable of observing the key processes associated with soil respiration. In this study, we develop a Remote Sensing Model for R e (ReRSM) by assuming that one part of R e is derived from current photosynthate with the respiratory rate coupling closely with gross primary production (GPP), and the other part of R e is derived from reserved ecosystem organic matter (including plant biomass, plant residues and soil organic matter) with the respiratory rate responding strongly to temperature change. The ReRSM is solely driven by the Enhanced Vegetation Index (EVI), the Land Surface Water Index (LSWI) and the Land Surface Temperature (LST) from MODIS data. Multi-year eddy CO 2 flux data of five vegetation types in Northern China and the Tibetan Plateau (including temperate mixed forest, temperate steppe, alpine shrubland, alpine marsh and alpine meadow-steppe) were used for model parameterization and validation. In most cases, the simulated R e agreed well with the observed R e in terms of seasonal and interannual variation irrespective of vegetation types. The ReRSM could explain approximately 93% of the variation in the observed R e across five vegetation types, with the root mean square error (RMSE) of 0.04 mol C m −2 d −1 and the modeling efficiency (EF) of 0.93. Model comparison showed that the performance of the ReRSM was comparable with that of the RECO in the studied five vegetation types, while the former had much fewer parameters than the latter. The ReRSM parameters showed good linear relationships with the mean annual satellite indices. With these linear functions, the ReRSM could explain approximately 90% of the variation in the observed R e across five vegetation types, with the RMSE of 0.05 mol C m −2 d −1 and the EF of 0.89. These analyses indicated that the ReRSM is a simple and alternative approach in R e estimation and has the potential of estimating spatial R e . However, the performance of ReRSM in other vegetation types or regions still needs a further study.

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The effect of water table fluctuation on soil respiration in a lower coastal plain forested wetland in the southeastern U.S.

et al. 2013

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[1] Anthropogenic and environmental pressures on wetland hydrology may trigger changes in carbon (C) cycling, potentially exposing vast amounts of soil C to rapid decomposition. We measured soil CO 2 efflux (R s ) continuously from 2009 to 2010 in a lower coastal plain forested wetland in North Carolina, U.S., to characterize its main environmental drivers. To understand and quantify the spatial variation due to microtopography and associated differences in hydrology, measurements were conducted at three microsites along a microtopographic gradient. The seasonal hysteresis in R s differed by microtopographic location and was caused by the transitions between flooded and nonflooded conditions. Because flooded R s was small, we reported R s dynamics mainly during nonflooded periods. A nested model, modified from conventional Q 10 (temperature sensitivity) model with dynamic parameters, provided a significantly better simulation on the observed variation of R s . The model performed better with daily data, indicating that soil temperature (T s ) and water table depth (WTD) were the primary drivers for seasonal variation. The diel variation of R s was high and independent of T s and WTD, which both had small diel variations, suggesting the likely association with plant activity. Overall, the site-average soil CO 2 efflux was approximately 960-1103 g C m À2 yr À1 in 2010, of which 93% was released during nonflooded periods. Our study indicates that R s is highly linked to hydroperiod and microtopography in forested wetlands and droughts in wetlands will accelerate soil C loss.

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Ecosystem respiration in two Mediterranean evergreen Holm Oak forests: drought effects and decomposition dynamics

Cited by 294 publications

References 62 publications

Ecosystem carbon exchanges of a subtropical evergreen coniferous plantation subjected to seasonal drought, 2003–2007

Ecosystem carbon exchanges of a subtropical evergreen coniferous plantation subjected to seasonal drought, 2003–2007

A remote sensing model to estimate ecosystem respiration in Northern China and the Tibetan Plateau

The effect of water table fluctuation on soil respiration in a lower coastal plain forested wetland in the southeastern U.S.

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