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通过室内培养试验,研究在施用有机物条件下接种蚯蚓对土壤团聚体的分布、团聚体的水稳性以及不同粒径的水稳性团聚体中有机碳含量的影响。干筛结果表明,不同秸秆施用方式下,蚯蚓接种能显著促进各个处理中>2mm团聚体含量的增加,且在秸秆混施的处理中表现得尤为明显,团聚体含量增加了2.95倍;湿筛结果表明,蚯蚓在不施和混施秸秆的处理中能显著降低土壤黏砂粒含量,即增加土壤中水稳性团聚体的含量,但是在表施秸秆的处理中显著降低了0.25~0.053mm粒级团聚体含量,使之分散为黏砂粒。蚯蚓和秸秆对土壤团聚体分布和水稳性的影响都达到显著水平。蚯蚓对水稳性微团聚体的影响极显著,而秸秆的作用更多地表现在水稳性大团聚体上。在秸秆表施和秸秆混施条件下,接种蚯蚓均显著促进了微团聚体碳含量的增加,分别为相应对照的2.1和1.2倍。蚯蚓作用能显著降低黏砂粒有机碳在全碳中含量,增加团聚体有机碳含量,主要是由于蚯蚓的作用能促进黏砂粒黏结为团聚体。
The effects of earthworm inoculation on the distribution of soil aggregates, the water stability of aggregates and the organic carbon content in water-stable aggregates of different particle sizes were investigated by laboratory culture experiments. The results of dry sieving showed that earthworm inoculation significantly promoted the increase of aggregates> 2 mm in each treatment under different straw application modes, especially in the treatment of straw mixed treatment, the content of aggregates increased 2.95 times; The results showed that earthworm could significantly reduce the content of soil aggregates, that is, increase the content of water-stable aggregates in the soil without applying and mixing straw, but significantly decreased the content of 0.25 ~ 0.053mm particles Level aggregate content, so dispersed as sticky sand particles. The effects of earthworm and straw on the distribution of soil aggregates and water stability all reached significant levels. The effects of earthworms on water-stable microaggregates were significant, while the effects of straw on water-stable macroaggregates were more pronounced. Earthworm inoculation significantly promoted the increase of carbon content of microaggregates under the condition of straw table dressing and straw mulching, which were respectively 2.1 and 1.2 times of the corresponding control. Earthworm effect can significantly reduce the content of organic carbon in the grit and increase the content of organic carbon in the aggregates, mainly because the earthworm can promote the cohesion of the grit sand aggregates.