| 环渤海低平原水土盐分与水位埋深的空间变异及协同克立格估值 |
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| 引用本文：周在明,张光辉,王金哲,严明疆.2011.环渤海低平原水土盐分与水位埋深的空间变异及协同克立格估值[J].地球学报,32(4):493-499. |
| DOI：10.3975/cagsb.2011.04.14 |
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| 基金项目:国家科技支撑计划项目(编号: 2007BAD69B02; 2009BADA3B05); 河北省科技厅重点基础研究项目(编号: 08966711D) |
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| 中文摘要:针对环渤海低平原水土盐分和水位埋深, 通过选取0~20 cm深度内的127个代表性土样进行土壤全盐量测定, 并对130个水井的水位埋深及128个地下水样的矿化度进行测定。综合运用普通克立格(Ordinary Kriging)与协同克立格(CoKriging)方法与GIS技术研究水土盐分及水位埋深的空间分布状况。结果表明, 土壤盐分和地下水矿化度的变异系数分别为0.91和0.87, 属于中等空间变异强度, 而水位埋深的变异系数为1.06, 属于强变异强度。单变量空间相关程度均属于中等, 交互变量的空间相关性较强, 其空间自相距离(135.6~223.2 km)高于单变量(40.6~144.8 km)。Kriging与CoKriging分析表明, 环渤海低平原土壤盐分与地下水矿化度分布规律基本一致, 而与水位埋深相反。即土壤盐分和地下水矿化度自内陆平原向东部滨海平原逐渐增加, 不同地面高程上存在分布差异, 并随着高程的降低呈增加的趋势。盐分含量以唐山—天津—沧州—东营—滨州一线较高, 矿化度以天津、沧州部分地区居高, 水位在黄河三角洲较浅。通过CoKriging插值的均方根误差与Kriging相比减少了0.29%~4.78%, 而预测值与实测值的相关系数提高了2.03%~20.58%。 |
| 中文关键词:环渤海低平原 土壤盐分 地下水矿化度 水位埋深 协同克立格 |
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| Spatial Variability of Soil Salinity, Total Dissolved Solid and Groundwater Depth Based on Cokriging in the Low Plain around the Bohai Sea |
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| Abstract:Taking into account the problem of soil salinity, total dissolved solid (TDS) of groundwater and groundwater level (GWL) existient in the low plain around the Bohai Sea, the authors collected soil samples at the depths of 0~20 cm from 127 sites in the plain, determined the soil salinity, and measured shallow groundwater depth in 130 sites and TDS of water samples in 128 sites. Classical statistical and geostatistical methods combined with GIS technique were used to analyze spatial variability of soil salinity, TDS and GWL. The results show that spatial variability of soil salinity and TDS belongs to the moderate degree while GWL belongs to the strong degree with Cv being 0.91, Cv being 0.87, and Cv being 1.06. The semivariogram and cross-semivariogram of soil salinity, TDS and GWL were fitted by the spherical and the exponential model respectively. Spatial correlation of single variables belongs to the moderate degree, while cross variable belongs to the strong degree, with spatial correlation distance 135.6 km to 223.2 km longer than 40.6 km to 144.8 km. Ordinary Kriging and CoKriging maps show that soil salinity and TDS spatial distribution are almost the same, increasing from the inland plain to the east coastal plain, spatial distribution difference exists in different altitudes, and the soil salinity and TDS rise with the decrease of the altitude; nevertheless, things are just the opposite for GWL. Soil salinity is high in Tangshan-Tianjin-Cangzhou-Dongying-Binzhou, TDS is high in some areas of Tianjin and Cangzhou, and GWL is low in the Yellow River Delta. In comparison with the ordinary Kriging with the same sampling numbers, the root-mean-square error produced by CoKriging decreases by 0.29%~4.78%, while the correlation coefficient between the predicted value and the measured value increases by 2.03%~20.58%. |
| keywords:low plain around the Bohai Sea soil salinity total dissolved solid groundwater level CoKriging |
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