The effect of land use type on net nitrogen mineralization on abandoned agricultural land : Silver birch stand versus grassland

摘要: Abstract The effect of land use type on the dynamics and annual rate net nitrogen mineralization (NNM) in a naturally generated silver birch stand grassland, both abandoned agricultural land, was assessed situ upper 0–20 cm soil layer using method buried polyethylene bags. Annual NNM (156 kg N ha−1 year−1) higher than grassland (102 kg N ha−1 year−1); cases covered major part plants demand. 0–10 cm (99 kg N ha−1 year−1) exceeded respective (51 kg N ha−1 year−1) roughly two times. In rates 0–10 10–20 cm layers were equal; 1.7 times deeper layer. intensity daily highest June May, 776 528 mg kg−1 N day−1, respectively. our study no significant correlation found between environmental factors monthly mean temperature, moisture content pH. share nitrification similar, 60% 63%, topsoil (10–20 cm) made up significantly proportion stand, 58% 35%, respectively; this may increase leaching from layers. Most probably, more intensive did not lead to N or emission losses ecosystems compared with because an essential amount is retained tree biomass.