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- W2070654839 abstract "Abstract Below-ground biomass might play an important role in the persistence of grasslands. The summertime water stress of Mediterranean grasslands very much accounts for annual plants in their communities. These plants die off in summer, and the soil seed bank ensures the grasslands' recovery every autumn. Temperature decreases with altitude, together with the proportion of annual and perennial herbs. This paper explores the vertical profile of this biomass in grasslands on the Iberian Peninsula along an altitudinal gradient and two geomorphological positions in each site. Both factors were considered to determine the development of below-ground biomass. We also took into consideration the experimental exclusion of livestock, considering that the presence or absence of herbivores may influence the aerial and underground structure of the grasslands. Using an allometric approach, we examined the relative distribution of below-ground biomass with depth and its temporal variation (“construction”). We found that there is a general allometric pattern in the vertical profile of variation of below-ground biomass in which density is inversely proportional to the depth of the stratum raised to the power of 1.8 (at high elevations) and 2.5 (low elevations). The construction process of these grasslands exhibits slight variations within a common pattern. Growth of the plant canopy can be temporally limited by the action of herbivores, a more complex underground structure thereby developing, with more strata and a more even biomass distribution. An adaptive reaction to the notable Mediterranean seasonal change appears to occur but, surprisingly, may depend upon altitude rather than upon the influence of herbivory. Keywords: Altitudinal gradientgeomorphologylivestock grazingroot biomassrural abandonment Acknowledgements This work has been funded by Ministerio de Ciencia y Tecnología (Spain), project no. AMB-1999-0462. We are grateful to the commission and owners of the field sites used for the study (Castillo de Viñuelas owners, J Arribas, Cercedilla and Canencia de la Sierra Municipal Councils and the Marqués de Castejón) for the facilities offered for the study." @default.
- W2070654839 created "2016-06-24" @default.
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- W2070654839 date "2011-09-01" @default.
- W2070654839 modified "2023-10-03" @default.
- W2070654839 title "Allometric patterns of below-ground biomass in Mediterranean grasslands" @default.
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- W2070654839 doi "https://doi.org/10.1080/11263504.2011.578836" @default.
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