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采取田间定位试验与室内分析相结合的方法,研究了有机稻蟹、常规稻蟹与单作水稻生产模式对土壤腐殖质组成及胡敏酸光学性质的影响。结果表明,与常规稻蟹和单作水稻模式相比,有机稻蟹模式易氧化有机碳含量分别提高30.13%(P<0.05)和55.85%(P<0.01),有机质氧化稳定性(Kos值)分别降低14.77%(P<0.05)和21.05%(P<0.01);有机稻蟹模式能提高可浸提腐殖质碳(HEC)、胡敏酸碳(HAC)含量和HAC/HEC,降低富里酸碳(FAC)及FAC/HEC,使其胡富比(H/F)上升(P<0.01);三种模式胡敏酸的E4/E6值与△log k的变化趋势相同,均表现为有机稻蟹>常规稻蟹>单作水稻。因此,有机稻蟹生产模式可以增加土壤总有机碳(TOC)的数量,改善其品质,提高土壤肥力,促进了水稻和蟹的生长,最终提高了稻谷和蟹的产量。
The effects of organic rice crab, conventional rice crab and monoculture rice on the composition of humus and the optical properties of humic acid were studied by field experiments and laboratory analysis. The results showed that the organic carbon content increased by 30.13% (P <0.05) and 55.85% (P <0.01), and the organic matter oxidation stability (Kos value) Decreased by 14.77% (P <0.05) and 21.05% (P <0.01), respectively. Compared with the control, the organic rice and crab mode increased the content of HEC, HAC and HAC / HEC, (FAC) and FAC / HEC increased the Hf ratio (P <0.01). The E4 / E6 values of the three models showed the same trend as △ log k Crab> conventional rice crab> single for rice. Therefore, organic rice and crab production mode can increase the amount of soil total organic carbon (TOC), improve its quality, improve soil fertility, promote the growth of rice and crab, and ultimately increase the yield of rice and crab.