Temporal and spatial variability of soil chemical and biological variables in a Mediterranean shrubland

Monokrousos, Nikolaos; Papatheodorou, Efimia M.; Diamantopoulos, J.; Stamou, George P.

doi:10.1016/j.foreco.2004.07.039

Cited by 37 publications

(25 citation statements)

References 22 publications

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“…Concerning the values of the studied parameters, the amounts of organic N, MBC, MBN, microbial activity and inorganic nitrogen recorded in all three treatments were comparable with values recorded in the soil of other Mediterranean grasslands in Northern Greece (Monokrousos et al, 2004;Papatheodorou et al, 2004). Further, the results of this paper showed that an average increase in soil T max in the range from 5 to It is well documented (Esteban-Parra et al, 1998;Pinol et al, 1998) that in Mediterranean areas, high summer temperatures along with low or absent precipitation generate a deep water stress.…”

Section: Discussionsupporting

confidence: 76%

Under climatic change, soil microbial community and variables relating to N-cycle are modulated by changes in the upper limit temperature

2013

Global NEST Journal

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The effect of temperature increase and more specifically its upper and low level correlates on soil microbial biomass, activity and N-cycle variables was studied in a Mediterranean shrubland. Experimental manipulation succeeded in establishing three treatments which, in comparison with the monthly ambient temperature, displayed an increase in mean monthly temperature by 2.1, 4.9 and 7.4 o C respectively. Also the upper limit temperature values (T max ), but not the low limit counterparts (T min ), differed significantly among the three treatments. T max changes seemed to affect directly only the microbial biomass, while it exerted an indirect effect on the majority of the other soil variables. With increased T max the values of the estimated soil microbial variables (microbial biomass and activity) increased, while other soil chemical variables, such as the inorganic forms of N, were found reducing. Organic N was the only variable remaining independent from changing T max at any treatment. The results of this paper indicate that the level of T max increase could be crucial for the structure of the microbial community. A T max increase up to 7 o C induced by climate change could favour the dominance of the soil bacterial populations, while larger increases could be in favour of the fungal populations.

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Section: Discussionsupporting

confidence: 76%

Under climatic change, soil microbial community and variables relating to N-cycle are modulated by changes in the upper limit temperature

2013

Global NEST Journal

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“…Soils of Mediterranean woodlands normally contain considerable amounts of SOC, with moder the main frequent type of humus (Vacca 2000;van Wesemael and Verstraten 1993;Sevink et al 1989), although mull humus is also widely represented (Peltier et al 2001;Sadaka and Ponge 2003;Andreetta et al 2011 and. The constraints and feedback processes resulting from the long and highly variable summer droughts have large effects on humus properties (Sevink et al 1989;van Wesemael and Verstraten 1993;Vacca 2000;Peltier et al 2001;Ponge 2003;Andreetta et al 2011) and microbial communities (Monokrousos et al 2004;Goberna et al 2006;Aponte et al 2010) in Mediterranean areas. Amounts of SOM in Mediterranean ecosystems depend on levels of precipitation (Boix-Fayos et al 1998;Gómez-Rey et al 2010) and type of plant community (LucasBorja et al 2010).…”

Section: Mediterranean Soilsmentioning

confidence: 99%

Plant-soil interactions in Mediterranean forest and shrublands: impacts of climatic change

2013

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Background In the Mediterranean climate, plants have evolved under conditions of low soil-water and nutrient availabilities and have acquired a series of adaptive traits that, in turn exert strong feedback on soil fertility, structure, and protection. As a result, plant-soil systems constitute complex interactive webs where these adaptive traits allow plants to maximize the use of scarce resources.

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“…Data are especially sparse for Mediterranean forest ecosystems (Sadaka and Ponge 2003;Tagger et al 2008), where both humus (Sevink et al 1989;van Wesemael and Verstraten 1993;Vacca 2000;Peltier et al 2001;Ponge 2003;Andreetta et al 2011) and microbial communities (e.g. Monokrousos et al 2004;Goberna et al 2005;Aponte et al 2010) have been found to be valuable indicators of responses of soil to the ecological constraints represented by long and variable summer droughts.…”

Section: Introductionmentioning

confidence: 99%

Microbial dynamics in Mediterranean Moder humus

et al. 2011

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There is a growing interest in the links between humus forms and soil biota, and little is known about these links in Mediterranean ecosystems. Culture-independent techniques, such as DNA extraction followed by DGGE and enzyme activities, allowed us to compare microbial communities in two horizons of a forest soil in different seasonal conditions. Direct in situ lysis was applied for extraction of DNA from soil; intracellular DNA was separated from extracellular and used to represent the composition of microflora. The aims were to describe how biochemical and microbiological parameters correlate with topsoil properties in typical Mediterranean Moder humus. Changes in bacterial and fungal community composition were evident from DGGE profiles. Degrees of similarity and clustering correlation coefficients showed that the seasonal conditions may affect the composition and activity of bacterial and fungal communities in the OH horizon, while in the E horizon the two communities were hardly modified. In the same season, OH and E horizons showed a different composition of bacterial and fungal communities and different enzyme activities, suggesting similar behaviour of eubacteria and fungi relatively to all the variables analysed. Evidently, different organic carbon content in soil horizons influenced microflora composition and microbial activities involved in the P and N cycles.

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Temporal and spatial variability of soil chemical and biological variables in a Mediterranean shrubland

Cited by 37 publications

References 22 publications

Under climatic change, soil microbial community and variables relating to N-cycle are modulated by changes in the upper limit temperature

Under climatic change, soil microbial community and variables relating to N-cycle are modulated by changes in the upper limit temperature

Plant-soil interactions in Mediterranean forest and shrublands: impacts of climatic change

Microbial dynamics in Mediterranean Moder humus

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