Soil respiration variation along an altitudinal gradient in the Italian Alps: Disentangling forest structure and temperature effects
نویسندگان
چکیده
On the mountains, along an elevation gradient, we generally observe ample variation in temperature, with associated difference vegetation structure and composition soil properties. With aim of quantifying relative importance edaphic properties on respiration (SR), investigated changes SR gradient (404 to 2101 m a.s.l) southern slopes Alps Northern Italy. We also analysed physicochemical properties, including organic carbon (SOC) nitrogen (N) stocks, fine root C N, litter bulk densities pH at five forest sites, stand structural height, age basal area. Our results indicated that rates increased temperature all 55–76% variability was explained by temperature. Annual cumulative SR, ranging between 0.65–1.40 kg -2 yr -1 , decreased while sensitivity (Q10) elevation. However, a high rate (1.27 ) low Q10 were recorded mature conifer 1731 a.s.l., characterized uneven-aged dominant tree resulting nonlinear relationship Reference 10°C (SR ref unrelated elevation, but related height. A significant negative linear found density Conversely, SOC, N stock, pH, mass best fitted relationships these parameters not significantly correlated when effect removed ). These demonstrate main factor affecting ecosystems this Alpine is its regulating role can be strongly influenced site biological characteristics, particularly type structure, quality microclimate. This study confirms sites are rich SOC more sensitive climate change, being prone losses as CO 2 . Furthermore, our data indicate positive suggesting uneven-age moderate Q10, may resilient.
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ژورنال
عنوان ژورنال: PLOS ONE
سال: 2021
ISSN: ['1932-6203']
DOI: https://doi.org/10.1371/journal.pone.0247893