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利用地统计学和地理信息系统(GIS)相结合的方法研究了沈阳市城区土壤(0～10cm)有机碳(总有机碳、颗粒态有机碳、易氧化态碳和碳黑)含量的空间变异性特征,绘制了有机碳含量的空间分布图。结果表明:土壤有机碳各项指标均符合偏态分布,经过对数转换后符合正态分布,变异函数的最佳理论模型都为线性模型,总有机碳、颗粒态有机碳、易氧化态有机碳和碳黑都具有强烈的空间变异性(C0与C0+C的比值分别为98.1%、100%、97.1%、99.0%),空间自相关距离分别为16.861km、21.805km,15.010km,18.735km。其中颗粒态碳表现出纯块金效应,不具有空间相关性。土壤有机碳空间变异性主要是由随机性因素(人类活动等)引起。所得结果可为城郊土壤的合理利用以及保护城市环境提供依据。
The spatial variability of soil organic carbon (total organic carbon, particulate organic carbon, readily oxidizable carbon and carbon black) in urban soils (0 ~ 10cm) in Shenyang City was studied by means of geostatistics and geographic information system (GIS) Sexual characteristics, draw the spatial distribution of organic carbon content. The results show that all the indexes of soil organic carbon are in accordance with the skewed distribution. After logarithmic transformation, they are in normal distribution. The best theoretical models of the variation function are linear models. The total organic carbon, particulate organic carbon, Both carbon and carbon black had strong spatial variability (the ratio of C0 to C0 + C was 98.1%, 100%, 97.1% and 99.0%, respectively). The spatial autocorrelation distances were 16.861km, 21.805km, 15.010km and 18.735 respectively km. Among them, the granular carbon shows a pure gold effect and does not have the spatial correlation. Spatial variability of soil organic carbon is mainly caused by random factors (human activities, etc.). The results can provide the basis for the reasonable utilization of suburban soil and the protection of urban environment.