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以宁陕县寨沟流域不同退耕年限地为研究对象,并以坡耕地作为对照,分层采集土样,测定土壤有机碳(SOC)含量、pH值、全氮(TN)含量、容重。借助spss软件和统计分析技术,探讨了土地利用方式改变后SOC的分布规律及其与pH值、TN、容重的相关关系。研究结果表明:随着退耕年限的增长,SOC和TN含量不断增大,且在垂直剖面上变化趋势基本一致,二者呈显著的正相关,相关系数均(r2)在0.867以上;退耕地SOC含量与pH值呈负相关,而坡耕地SOC与pH值呈正相关。
Taking Zhaigou watershed of Ningshan County as an example, the soil samples were collected in different strata. Soil organic carbon (SOC), pH, total nitrogen (TN) content and bulk density were measured with slope farmland as control. With the help of spss software and statistical analysis techniques, the distribution of SOC after land use change and its relationship with pH, TN and bulk density were discussed. The results show that: with the increase of returning farmland, the contents of SOC and TN increase continuously, and the variation trends in the vertical section are basically the same, the two are positively correlated, the correlation coefficient (r2) is above 0.867; Content and pH value was negatively correlated, while slope farmland SOC and pH value was positively correlated.