然而当前的生产管理方式尽管有利于土壤有机质积累，但是也带来了一系列的生态环境问题。
Although the SOM content was improved, the current agricultural practices brought on a series of ecological problems as well.
土壤有机质是影响重金属积累的主要因素。
Soil organic matter is the major factor to influence the accumulation of heavy-metal elements.
试验结果表明，长期施用有机肥料和秸秆还田可明显促进土壤有机质和易氧化有机质的积累，而难氧化有机质和KOS值降低。
The research showed that the organic matters and active organic matters increased obviously, but the inactive organic matters and KOS value decreased with long-term application of organic fertilizer.
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