北京市北部城区公路绿化带土壤易氧化碳的研究

Soil Readily Oxidizable Carbon of Roadside Greenbelts in Northern Beijing

土壤易氧化碳对外界环境变化反应敏感,是评价土壤质量的重要依据。文章以北京市公路绿化带土壤为研究对象,测定了土壤有机碳及易氧化碳的含量。研究表明,公路绿化带草地土壤有机碳和易氧化碳平均含量分别为11.99 g/kg和0.51 g/kg,而空地上相应的指标分别为11.00 g/kg和0.41 g/kg;各个环路之间草地和空地土壤易氧化碳含量不存在显著性差异;土壤易氧化碳在有机碳中所占的比例为3.23%～5.34%,其中二环路上土壤易氧化碳所占比例显著低于四环路和五环路。总的来看,草地可以增加土壤的活性有机碳含量。

Soil readily oxidizable carbon, as an important basis for evaluation of soil health, is sensitive to external conditions. Soil active organic carbon and soil readily oxidizable carbon of the road greenbelts located in Northern Beijing were analyzed. The research showed that the average content of grassland soil active organic carbon and readily oxidizable carbon were 11.99g ·kg^-1 and 0.51g · kg^-1, and that of the open space soils were 11.00g · kg^-1 and 0.41g · kg^-1 respectivly. There was no significant difference about the soil readily oxidizable carbon content between grassland and open space among the greenbelts. The proportion of soil easily dioxizable carbon in the organic carbon was from 3.23% to 5.34%. The proportion of the second ring road was significantly lower than the forth ring road and the fifth road. In one word, the grassland can increase the activity of organic carbon content of the soil.