The palces of Shanghai were obliously lower, whose value was 5.05-14.28 g·kg~(-1). Overall, the soil carbon density and soil organ content of central business district was lower than other places.3.
总体上看,中心商业区土壤碳密度和有机碳含量普遍偏低。
参考来源 - 上海城市绿地土壤碳储量格局与理化性质研究·2,447,543篇论文数据，部分数据来源于NoteExpress
对不同土壤类型碳密度随时间的变化，用回归分析的方法，建立土壤碳密度变化模型。
The soil carbon density change model is based on regression analysis of the carbon densities of different soils.
结果表明，总体上我国实测点位（或区域）耕作土壤平均有机碳密度在此期间略有增加。
The results show that the average organic carbon density in cultivated soils has experienced a carbon gain during the period.
区域草地土壤有机碳密度及储量呈明显的水平和垂直分异规律。
The very cold environment results in the higher value of soil organic carbon density in the study area.
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