氮素可限制植物光合、有机质分解、同化产物的分配以及生态系统对大气co2浓度升高的响应。
Nitrogen has great effects on the plant photosynthesis, organic matter decomposition, carbon allocation and the responses of ecosystem when the atmospheric CO2 concentration increases.
土壤有机质是微生物分解植物和动物残体的产物。
Soil organic matter is the product of microbial decomposition of plant and animal residues.
分析结果表明，除硒元素外，随着钼元素和锆元素的加入，褐煤有机质气态产物的生成量显著提高。
The results indicated that the trace elements molybdenum and zirconium increased considerably the gas yields of the lignitic organic matter while selenium did not.
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