Lai, Roberto (2011) Dinamica spazio-temporale della respirazione eterotrofa del suolo in un sistema agrario mediterraneo. Doctoral Thesis.
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For the understanding the dynamics of soil carbon budget is important to evaluate the impact of land-use change on long period on soil heterotrophic respiration. This study focuses the relationship between land use and soil heterotrophic respiration in a Mediterranean agro-ecosystem, where there are four different managements established more than twenty years ago. The agrarian system contained two vineyards with different management systems, the rotation hayland-pasture contains trees of Quercus suber L.. Soil heterotrophic respiration monitoring was performed for one year; measurements were made with a portable, closed, chamber connected to an IR gas analyser; root autotrophic respiration was excluded by the trenching method. Soil respiration was measured coupled at soil temperature and soil moisture. The results showed for all land use two picks of soil respiration activity: one on spring and one on autumn. Annual mains showed lower values for tilled vineyard and higher values on grass cover vineyard. Soil respiration was related to water content and soil temperature except on the picks. On these periods soil respiration was related to soil organic matter content.
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