Soil water availability strongly modulates soil CO2 efflux in different Mediterranean ecosystems: Model calibration using the Bayesian approach

Correia, Alexandra; Minunno, Francesco; Caldeira, María C.; Banza, J.; Mateus, João; Carneiro, M.; Wingate, Lisa; Shvaleva, Alla; Ramos, Alzira; Jongen, Marjan; Bugalho, Miguel N.; Nogueira, Carla; Lecomte, Xavier; Pereira, J. S.

doi:10.1016/j.agee.2012.07.025

Cited by 32 publications

(17 citation statements)

References 55 publications

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“…Comparing the literature, it appears that soil CO 2 efflux (soil respiration) in karst region is weaker than in the non-karst region. Our results show that temperature and soil moisture have large effects on soil CO 2 efflux, and drought significantly reduces soil respiration as was observed by other investigators (Fang and Mocrieff 2001;Xu and Qi 2001;Pingintha et al 2010;Correiaa et al 2012), Seasonal variation in soil CO 2 concentration and respiration can be largely explained by soil temperature. In a barerocky-karst ecosystem, ground surface may consist of soil, rock flats, rock crevices and rock gullies.…”

Section: Discussionsupporting

confidence: 70%

CO2 emission response to different water conditions under simulated karst environment

Huang

et al. 2015

Environ Earth Sci

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Habitat degradation has been proven to result associated with drought in karst region in south China. However, how this drought condition relates to CO 2 efflux is not clear. In this study, we designed a simulated epikarst water-rock (limestone)-soil-plant columns, under varying water levels (treatment), and monitored CO 2 concentration and efflux in soil in different seasons during 2011. The results showed that increased soil water greatly enhanced CO 2 concentrations. With which treatment with epikarst water (WEW) had higher CO 2 concentration than without epikarst water (WOEW). This was particularly high in low soil water treatment and during high temperature in the summer season. Under 30-40 % relative soil water content (RSWC), CO 2 concentration in WEW treatment was 1.44 times of WOEW; however, under 90-100 % RSWC, this value was smaller. Comparatively, soil surface CO 2 efflux (soil respiration) was 1.29-1.94 lmol m -2 s -1 in WEW and 1.35-2.04 lmol m -2 s -1 in WOEW treatment, respectively. CO 2 efflux increased with increasing RSWC, but it was not as sensitive to epikarst water supply as CO 2 concentration. WEW tended to weakly influence CO 2 efflux under very dry or very wet soil condition and under low temperature. High CO 2 efflux in WEW occurred under 50-80 % RSWC during summer. Both CO 2 concentrations and CO 2 efflux were very sensitive to temperature increase. As a result, at degraded karst environment, increased temperature may enhance CO 2 concentration and CO 2 emission; meanwhile, the loss of epikarst and soil water deficiency may decrease soil CO 2 concentration and CO 2 emission, which in turn may decrease karst corrosion.

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Section: Discussionsupporting

confidence: 70%

CO2 emission response to different water conditions under simulated karst environment

Huang

et al. 2015

Environ Earth Sci

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“…In addition, in order to fill respiration gaps and to assess the total respiration over the monitored period, the air temperature was used as an environmental variable for CO 2 modeling. In fact, although some authors have modeled soil respiration using environmental parameters, such as soil water content and water table depth (Almagro et al, 2009;Correia et al, 2012;Rowson et al, 2013), most authors have found a highly significant relationship between soil or air temperature and soil respiration (Luo and Zhou, 2006;Richardson et al, 2006;Subke et al, 2006). On the basis of three different criteria, we thus selected the LT model in terms of the Q10 and the simplified RothC, in agreement also with Davidson et al (2006) and Luo and Zhou (2006).…”

Section: Soil Co 2 Flux Measurements and Cumulated Valuesmentioning

confidence: 56%

“…In addition to such factors, the not limiting soil water content could have determined larger fluxes compared to those commonly registered in mineral soils in Mediterranean areas (from 3.19 to 25.09 g CO 2 m À2 day À1 ) (Almagro et al, 2009;Mancinelli et al, 2010;Correia et al, 2012).…”

Section: Soil Co 2 Flux Measurements and Cumulated Valuesmentioning

confidence: 95%

Agricultural abandonment in Mediterranean reclaimed peaty soils: long-term effects on soil chemical properties, arbuscular mycorrhizas and CO2 flux

Pellegrino

Bosco

Ciccolini

et al. 2015

Agriculture, Ecosystems & Environment

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“…In Mediterranean ecosystems, summer drought is the main driver of carbon assimilation and partitioning [29], and induces strong ecophysiological adjustments such as reduced stem growth [30], reduced leaf area and the subsequent effects on litterfall [31], and an increased root/shoot ratio [32]. Several studies have dealt with soil respiration in Mediterranean ecosystems submitted to prolonged summer droughts [33][34][35][36] and growing on the most frequently observed shallow and rocky soils. Few, if any, forest soil respiration studies have been conducted on fertile warm and humid conditions within the Mediterranean, as these favorable environments are mostly used for agriculture, so the range of study cases hardly cover the full panel of climatic/edaphic conditions.…”

Section: Introductionmentioning

confidence: 99%

Warm and Fertile Sub-Humid Conditions Enhance Litterfall to Sustain High Soil Respiration Fluxes in a Mediterranean Cork Oak Forest

Zribi

Mouillot

Gharbi

et al. 2015

Forests

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Soil respiration is a major component of the global carbon budget and Mediterranean ecosystems have usually been studied in locations with shallow soils, mild temperatures, and a prolonged dry season. This study investigates seasonal soil respiration rates and underlying mechanisms under wetter, warmer, and more fertile conditions in a Mediterranean cork oak forest of Northern Tunisia (Africa), acknowledged as one of the most productive forests in the Mediterranean basin. We applied a soil respiration model based on soil temperature and relative water content and investigated how ecosystem functioning under these favorable conditions affected soil carbon storage through carbon inputs to the soil litter. Annual soil respiration rates varied between 1774 gC m −2 year −1 and 2227 gC m −2 year −1 , which is on the highest range of observations under Mediterranean climate conditions. We attributed this high soil carbon flux as a response to favorable temperatures and soil water content, but this could be sustained only by a small carbon allocation to roots (root/shoot ratio = 0.31-0.41) leading to a large allocation to leaves OPEN ACCESSForests 2015, 6 2919 with a multiannual leaf production, enhanced annual twig elongation (11.5-28.5 cm) with a reduced leaf life span (<1 year) maintaining a low LAI (1.68-1.88) and generating a high litterfall (386-636 gC m −2 year −1 ). Thus, the favorable climatic and edaphic conditions experienced by these Mediterranean cork oak forests drove high soil respiration fluxes which balanced the high carbon assimilation leading to a relatively small overall contribution (10.96-14.79 kgC m −2 ) to soil carbon storage.

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Soil water availability strongly modulates soil CO2 efflux in different Mediterranean ecosystems: Model calibration using the Bayesian approach

Cited by 32 publications

References 55 publications

CO2 emission response to different water conditions under simulated karst environment

CO2 emission response to different water conditions under simulated karst environment

Agricultural abandonment in Mediterranean reclaimed peaty soils: long-term effects on soil chemical properties, arbuscular mycorrhizas and CO2 flux

Warm and Fertile Sub-Humid Conditions Enhance Litterfall to Sustain High Soil Respiration Fluxes in a Mediterranean Cork Oak Forest

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