ISSN 0235-7224
ISSN 2029-0586 (online)
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2009 m. Nr. 2
Impacts of long-term intensive organic inputs on carbon index correlations in meadow ecosystems
Saulius MARCINKONIS, Sigitas LAZAUSKAS, Virmantas POVILAITIS, Colin A. BOOTH
Carbon (C) accumulation and distribution in an organic fertilized meadow ecosystem are presented, with the aim of assessing the impact of farm waste applications on spatial C dynamics and CO2 emissions. C distribution in intensively manured soils (long-term slurry application) from the Lake Lapoja basin and in vegetation were determined in-situ and by laboratory analyses which revealed large variations of C in both soil organics (0.7–6.8%) and vegetation (17–41%). CO2 concentrations in soil surface (74%) with the vegetation removed, in a mowed vegetation surface (62%) and above the vegetation canopy (43%) have been determined relative to the soil arable layer. This is perceived to be a consequence of natural variability and anthropogenic impact. Therefore, for land use simulation, geostatistical approaches were developed to assess the impacts on CO2 concentrations in situ. However, they have also revealed a variety of spatial C index patterns and as such were deemed unsuitable for CO2 emission modelling.
Keywords: meadow ecosystem, gas exchange indexes, contour maps, landuse
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