不同耕作模式对东北黑土腐殖质结合形态的影响

Effects of Different Cultivated Modes on Combined States of Humus in Black Soil

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。

The aim of the field experiment was to investigate the effects of different cultivated modes on the combined states of humus of phaeozem in northeast China. Soil humus was extracted adopted grouping method of humus combined forms modified by Xiong YiFu Jiping, then the soil organic carbon contents were determined respectively. Experimental results showed that the content of humus of phaeozem in different cultivated modes was different. Among them, there were little variation in the content of loosely-combined humus and unitedly-combined humus, but there were great changes in the content of stably-combined humus and tightly-combined humus. C value was the highest in the content of them. The influence to HA/FA showed little impact on loosely-combined humus arid great impact on unitedly-combined humus and stably-combined humus because of the significant differences between the disposal of C, D and F. Different cultivated modes had little effect on E4/E6 in black soil, and the E4/E6 of loosely- combined humus and stably-combined humus had no obvious change, only in the unitedly-combined humus of E4/E6 were there significant differences between the disposal of E,F and A. The cultivated modes were different, so the contents of various forms of humus were different. Among them, overall performance of C treatment was the best, which improved the content of different combined humus.