有机物料循环对红壤稻田系统有机质积累的贡献研究

Contribution of organic residue cycling to the soil organic matter in red paddy system.

中长期定位试验研究有机物料循环再利用对红壤稻田系统土壤有机质积累的贡献结果表明,红壤稻田系统有机物料自然归还量可达6 16 2kg/hm2 ,人为归还量可达13480kg/hm2 ;仅依靠系统内有机物料的自然归还,其土壤有机质亏缺为5 0 %左右,呈下降趋势;系统内可循环再利用的有机物料全部还田,土壤有机质盈余率可达80 %以上;预测结果显示有机物料循环再利用5 0年内可提高土壤有机质19.4～32 .6 g/kg ,增长率达83.6 %～14 0 .5 %

Based on a medium or long term located experiment, t he contributions of organic residue cycling to the soil organic matter in red pa ddy system are studied. The results show that the self ret urned amount and art ificial returned amount of organic residue are up to 6162kg /hm 2 and 13480kg/hm 2, respectively; the soil organic matter shows a decreasing trend merely depending on the self returned organic residuce,and the deficit of soil organic matter is up to 50% or so; surplus of soil organic matter is up to 80% while all organic residues are returned. The simulation result shows that the content of soi l organic matter can increase by 19.4～32.6g/ kg and the increasing ratio is up to 83.6%～140.5% after 50 years with organic residue cycling.