【摘 要】
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A long-term experiment set up in 1980 compared the effects of applying manures and chemical fertilizers on a paddy soil in the Taihu Lake region, China. Of the
【机 构】
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Institute of Soil Science,Institute of Agricultural Sciences fin Taihu Lake Region,College of Enviro
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A long-term experiment set up in 1980 compared the effects of applying manures and chemical fertilizers on a paddy soil in the Taihu Lake region, China. Of the fourteen randomly distributed treatments consisting of different combinations of organic manure, inorganic nitrogen(N), phosphorus(P), and potassium(K), and rice straw, eight were selected for the present study in 2007. Application of organic manure plus straw significantly increased soil organic carbon(SOC)content of the topsoil(0-10 cm)compared to that of chemical fertilizers alone. The content of SOC was relatively stable in the 10-30 cm layer in the chemical fertilizer treatments and in the 20-40 cm layer in the manure treatments. The stable carbon isotope ratio(δ13C)ranged from-24‰ to-28‰ and increased gradually with depth. The content of SOC was significantly(P
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