小流域尺度下土壤有机碳和全氮空间变异特征  

Spatial variability of soil organic carbon and total nitrogen based on small watershed scale

作　　者：李海东[1,2] 林杰[1] 张金池[1] 张小庆[1] 张莉[3] 王圳[1] 

机构地区：[1]南京林业大学,江苏省高校林业生态工程重点实验室,江苏南京210037 [2]环境保护部南京环境科学研究所,江苏南京210042 [3]天津市环境影响评价中心,天津300191

出　　处：《南京林业大学学报（自然科学版）》2008年第4期38-42,共5页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：国家“十一五”科技支撑课题(2006BAD03A16);国家自然科学基金重点项目(30471375)

摘　　要：以小流域为尺度,通过Kriging插值用Surfer8.0软件绘制南京邓下小流域土壤有机碳(SOC)和全氮(TN)等值线图,研究了土壤有机碳和全氮空间变异特征。结果表明:(1)研究区土壤有机碳和全氮平均值分别为1.60%和0.15%,变异系数分别为44.43%和30.73%,属于中等强度变异,有机碳的变异性较强。经Kolmogorov-Sm irnov检验,土壤有机碳和全氮都符合正态分布。(2)选择球状模型、指数模型分别为土壤有机碳和全氮的半方差函数理论模型,土壤有机碳和全氮的Co/(Co+C)值均小于25%,表明在变程内具有强烈的空间相关性;以小流域尺度进行土壤有机碳和全氮空间分布研究能得到较准确的结果。(3)研究区土壤有机碳和全氮分布规律是有机碳在北部较高,东南部较低,呈自北部向东南递减趋势,最低处以岛状分布在中南部,全氮空间分布和有机碳的空间分布趋势大致相同。The spatial variability characteristics of soil organic carbon （SOC） and total nitrogen （TN） were studied based on watershed scale, The data were analyzed by the Kriging interpolation method in the SUFER software. The results showed that the means of SOC and TN were 1.60 % and 0. 15 % , and the variance coefficients were 44.43 % and 30. 73 % respectively. Both of them belong to medium spatial variability. SOC and TN presented normal distribution with Kolmogorov-Smirnov test value 0. 123 and 0. 043. The theoretical semi-variogram models of SOC and TN were spherical and exponential respectively. The C0/（ C0 ＋ C） of SOC and TN were 24.12 % and 3.57 % respectively. It also indicated that the SOC and TN had strongly spatial self-relativity in this area. The geo-statistics precision of spatial variability of SOC and TN was significant based on watershed scale, with lag 0. 500 km and range 7. 408 3 km. The whole distribution tendency of SOC in this area was higher in the north part than that in the southeast part, but there was the lowest value existing in the middle part just as small block. The TN spatial distribution was similar with the distribution of SOC.

关 键 词：小流域尺度 GIS 有机碳 全氮 空间变异 南京 

分 类 号：S718[农业科学—林学]