Soil Respiration Behaviour in a Mediterranean Aleppo Pine Forest in North Tunisia

Rezgui, F.; Gharbi, Fatma; Zribi, Lobna; Mouillot, Florent; Ourcival, Jean‐Marc; Hanchi, Belgacem

doi:10.15666/aeer/1404_343356

Cited by 5 publications

(6 citation statements)

References 46 publications

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“…Quercus suber L. covers 70,000 ha on the northern part of the country where mean annual precipitation is 800 mm, varying between 700 mm and 1500 mm, and mean temperature is 16 • C [21]. Pinus halepensis Miller covers 361,000 ha in the central part of the country where mean annual precipitation is 400 mm [22]. Mediterranean shrublands cover 328,000 ha and they are composed of Arbutus unedo L., Erica arborea L. Cistus spp.…”

Section: Study Areamentioning

confidence: 99%

“…In Tunisia, fuel moisture conditions can be regionally variable in the forested wettest northern part of the country according to the climate gradient and topographical features [21,30,31]. In addition, shallow-rooted shrubland species and the herbaceous litter fuel at the surface layer comprise a large part of natural vegetation, and may be even more susceptible to frequent summer droughts [22,23,32]. Over the whole country, long-term drought reconstructions that are based on tree-rings revealed that recent decades appear as among the driest [33], and confirmed recurrent droughts in the studied period.…”

Section: Heat Waves and Fire Events In The Mediterranean Basinmentioning

confidence: 99%

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Saharan Hot and Dry Sirocco Winds Drive Extreme Fire Events in Mediterranean Tunisia (North Africa)

2020

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With hot and dry summers, the Mediterranean basin is affected by recurrent fires. While drought is the major driver of the seasonal and inter-annual fire distribution in its northern and mildest climate conditions, some extreme fire events are also linked to extreme winds or heat waves. The southern part of the Mediterranean basin is located at the driest range of the Mediterranean bioclimate and is influenced by Saharan atmospheric circulations, leading to extreme hot and dry episodes, called Sirocco, and potentially acting as a major contributor to fire hazard. The recently created fire database for Tunisia was used to investigate the ±10-day pre- and post-fire timeframe of daily weather conditions associated with fire events over the 1985–2006 period. Positive anomalies in minimum and maximum temperatures, negative anomalies in air relative humidity, and a preferential south-eastern wind during fire events were identified, which were characteristic of Sirocco winds. +7 °C anomalies in air temperature and −30% in relative air humidity were the critical thresholds for the most extreme fire conditions. In addition, meteorological anomalies started two days before fire events and lasted for three days after for large fires >400 ha, which suggests that the duration of the Sirocco event is linked with fire duration and final fire size. Lastly, the yearly number of intense Sirocco events better explained the inter-annual variability of burned area over the 1950–2006 period than summer drought based on Standardized Precipitation Evaporation Index (SPEI) indices.

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Section: Study Areamentioning

confidence: 99%

Section: Heat Waves and Fire Events In The Mediterranean Basinmentioning

confidence: 99%

Saharan Hot and Dry Sirocco Winds Drive Extreme Fire Events in Mediterranean Tunisia (North Africa)

2020

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“…Quercus suber L. covers 70,000 ha on the northern part of the country where mean annual precipitation is 800 mm varying between 700 m and 1500 m, and mean temperature is 16 • C [42,43]. Pinus halepensis Miller covers 361,000 ha in the southern part of the country where mean annual precipitation is 400 mm [44]. Mediterranean shrublands cover 328,000 ha and are composed of Arbutus unedo L., Erica arborea L., Cistus spp.…”

Section: Study Areamentioning

confidence: 99%

A Revised Historical Fire Regime Analysis in Tunisia (1985–2010) from a Critical Analysis of the National Fire Database and Remote Sensing

Belhadj-Khedher

Koutsias

Karamitsou

et al. 2018

Forests

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Long-term fire history reconstructions provide fruitful information in the context of global change. Global remotely-sensed burned areas offer a uniform estimate of fire regimes worldwide, but hardly capture small fire events and cover only the last 20 years. Burned areas from national statistics often lack credibility due to discrepancies in fire report protocols between countries, partial data records and uncertain burned area estimates from field observations. However, they constitute a unique and valuable alternative long-term key source of information. We provide here a detailed critical analysis of the fire database in Tunisia, on the southern boundary of the Mediterranean basin and with a contrasted socio-economic environment compared to the more studied European side. We analyzed the fire record database with a quality checking protocol, combined with remote sensing burned area characterization from Landsat images. The high uncertainties in fire numbers could not lead to any conclusion for an accurate trend estimate. The corrected burned area lead to an average yearly burned area of 1799 ha year −1 compared to previous estimates of 1017 ha year −1 , leading to a fraction of burnable land affected by fires of 0.19%, on the lowest range of observations in the Mediterranean basin. From this corrected database, we revised the usually assumed burned area decrease in this region, with no significant trend detected over the 1985-2010 period. We conclude on the need for thorough assessment of data quality in fire history reconstruction from national statistics to prevent misleading conclusions, and for an increased credibility, in order to be further used in fire models benchmarking or fire weather analysis. Our results can contribute to the under-represented fire regime analysis on the southern boundary of the Mediterranean basin.

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“…5 a,b). The root respiration and microbial decomposition contributed to the high value of the total ST (Tang et al 2005) and were most common in the growing period of the pine-dominated forest (Rezgui et al 2016). In some pine forests of central California (Carbone et al 2011), the conifer forest of San Rossore (Matteucci et al 2015) and the Tunisian Aleppo pine forest (Rezgui et al 2016) reported that autotrophic SR peaks after the precipitation events.…”

Section: Discussionmentioning

confidence: 98%

Soil Carbon Fluxes and Sensitivity Analysis – A Study in Pinus roxburghii Forest

Dhital

Gosain

Maharjan

2022

Nepal Journal of Science and Technology

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The predicted increasing atmospheric carbon dioxide (CO2) level is responsive to altering the future climate, and a small change in the soil carbon may significantly affect the forest carbon cycle and climate system. Soil respiration (SR) and its influencing factors like soil temperature (ST), soil water content (SWC) and surface litter-fall were measured monthly over one year in a sub-tropical Pine (Pinus roxburghii) forest of Bhaktapur district located in central Nepal to determine the SR of the forest and, its variations and sensitivity. The results showed that SR varied to the changes in ST by an exponential significant positive correlation between them. The optimum SR was observed between 10 and 22ºC, and the highest SR were obtained above ST at 20ºC. The temperature sensitivity value of SR (Q10) was estimated at Q10 = 2.13. The significant exponential curve represented the effect of SWC on SR. The higher SR rate was mostly measured between 10 and 25% SWC. The monthly and seasonal variations of the SR rate were consistent with the ST, SWC and litter-fall variations. The study showed that the combined effect of temperature and precipitation might be the major cause of SR variations; however, ST is adequate for increasing SR. Hence, the warming further enhances carbon emission from the forest floor and inversely increases carbon to contribute to climatic change through this pine-dominated forest stand structure.

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Soil Respiration Behaviour in a Mediterranean Aleppo Pine Forest in North Tunisia

Cited by 5 publications

References 46 publications

Saharan Hot and Dry Sirocco Winds Drive Extreme Fire Events in Mediterranean Tunisia (North Africa)

Saharan Hot and Dry Sirocco Winds Drive Extreme Fire Events in Mediterranean Tunisia (North Africa)

A Revised Historical Fire Regime Analysis in Tunisia (1985–2010) from a Critical Analysis of the National Fire Database and Remote Sensing

Soil Carbon Fluxes and Sensitivity Analysis – A Study in Pinus roxburghii Forest

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