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.
目前有资料表明，我国水稻土具有比旱地土壤较高的表土有机碳密度，且近20年来存在着升高的趋势。
Some data indicate that the soil organic carbon density of paddy soil is higher than that of dry cropland soil in China, and has an increasing tendency over the last 20 years.
国内研究表明，目前耕地的地力不稳，土壤有机碳密度较低，农田土壤固碳的潜力较大。
All research results showed that the cultivated land fertility was unstable; density soil organic carbon was lower.
土地利用、耕作、作物类型、种植密度、灌溉、施肥以及其他人为活动等，对农田生态系统土壤有机碳库的变化均能产生影响。
Land use, cultivation, crop selection, planting density, irrigation, fertilization, and other anthropogenic activities all affect the dynamics of SOC pool.
对毛竹土壤有机碳密度影响最大的为有机碳含量，对土壤有机碳密度的影响次之的为土壤全氮量，土壤有效磷量对其影响程度也较大。
The biggest influence to soil organic carbon density was organic carbon content, the next was total nitrogen, and content of soil available phosphorus was also influenced soil organic carbon density.
结果表明：（1）土壤有机碳密度具有高度的空间变异性。
Result showed:1. The amount of carbon varied significantly at different districts in Shaan'Xi.
结果表明：（1）土壤有机碳密度具有高度的空间变异性。
Result showed:1. The amount of carbon varied significantly at different districts in Shaan'Xi.
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