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Fast-growing trees provide opportunities for carbon (C) sequestration. This study compared the C sequestration potential and cost benefit of four cultivation systems in southern Quebec, Canada. The systems studied included two hybrid poplar cultivation systems, a hybrid poplar and hay intercropping system (111 trees ha−1) and a hybrid poplar plantation (1,111 trees ha−1), and two agricultural systems,...
Among factors controlling decomposition and retention of residue C in soil, effect of initial soil organic C (SOC) concentration remains unclear. We evaluated, under controlled conditions, short-term retention of corn residue C and total soil CO2 production in C-rich topsoil and C-poor subsoil samples of heavy clay. Topsoil (0–20 cm deep, 31.3 g SOC kg−1 soil) and subsoil (30–70 cm deep, 4.5 g SOC...
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