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通过田间试验,研究不同耕作模式对东北黑土腐殖质结合形态的影响。采用熊毅-傅积平改进的结合态腐殖质分组法提取土壤中腐殖质,再分别进行有机碳含量测定。试验结果表明:不同耕作模式下黑土腐殖质含量不同,其中松结态、联结态腐殖质含量变化均很小,稳结态、紧结态腐殖质含量则出现较大的变化。二者含量均以C(地膜覆盖+常规播种)处理值最高;对胡富比(H/F)的影响则表现为对松结态的影响较小,只有C(地膜覆盖+常规播种)、D(覆膜滴灌+常规播种)处理与F(覆膜滴灌+秸秆鸡粪)处理之间有显著差异,对联结态和稳结态的影响较大,差异显著;不同耕作模式对黑土E4/E6的影响不大,其中松结态和稳结态E4/E6无明显变化,只有联结态E4/E6中E、F处理与A(常规耕作+常规播种)处理之间有显著差异。耕作模式不同,腐殖质各形态的含量不同。其中C处理整体表现最优,提高了各结合形态腐殖质含量。
Field experiments were conducted to study the effects of different tillage patterns on the humus-bound morphology of black soil in Northeast China. The soil humic substances were extracted by the combined humus grouping method modified by Xiong Yi and Fu Jiping. The contents of organic carbon were determined respectively. The results showed that the humus contents of black soil were different under different tillage modes, and the contents of loosely-bound and bound humus were very small. The steady-state and tight-junction humus content changed greatly. The content of both was the highest in C (mulching + conventional sowing), while the effect on the ratio of H / F was slightly less than that of pine knot, except for C (mulching + conventional sowing) D (film drip irrigation + conventional sowing) treatment and F (mulching drip irrigation + straw manure) were significantly different, which had a great influence on the state of association and steady state. The effects of different tillage models on E4 / E6 had little effect on E4 / E6, but there was no significant difference between E4 / E6 in E4 / E6 and A (conventional tillage + conventional sowing). Different farming patterns, the content of humus various forms. Among them, C treatment showed the best overall performance and increased the content of humus in each combination form.