渭-库河绿洲植棉土壤有机质及盐分之间的相关性分析

Correlation Analysis Between Soil Organic Matter and Salinity of Cotton Planted Areas in Ugan-Kuqa River Delta Oasis

[目的]为了实现提高施肥的精度,减少浪费和保护农业资源和环境质量。[方法]在野外取样、GPS定位、样品分析的基础上,获取土壤样品的理化性质等监测数据。在SPSS和GS＋的支持下,运用统计分析、相关分析等方法,以渭-库河绿洲植棉土研究对象,分析耕层土壤有机质现状及其与盐分之间的相关特性。[结果]渭-库河绿洲植棉土有机质平均含量为15.8117.65 g/kg,盐分为3.173.42 g/kg;有机质的变异系数介于13.87%16.19%,盐分的变异系数介于57.10%61.99%;有机质与盐分离子在各个土层中相关特征不一,其在中层土壤中与Mg2＋具有显著性负相关;空间自相关分析表明,有机质的空间结构优于全盐,且二者不论在哪个土层,各自的空间相关性差异不大。[结论]研究区植棉土壤不同土层有机质含量在表层、中层、底层其变异系数依次为16.19%、13.87%、14.28%,表层有机质变异强度最大,底层次之,中层有机质变异最小。盐离子在各个土层变异系数有差异,没有明显特征规律。有机质与HCO3-、Cl-、SO2-4、Ca2＋、K＋＋Na＋等盐离子在表层、中层均具有不同程度的相关特征,但相关性不明显。在表层、中层、底层土壤中有机质含量依次为8.58%、6.29%、6.09%,具有递减趋势特征;盐分在土壤表层、中层、底层的含量依次为3.32、3.42、3.21 g/k,各土层盐分的含量相差甚小,与土壤层次的相关性不明显。有机质的分维数大小排列为中层〉底层〉表层。不同土壤层级中全盐的空间分维数依次是底层〉表层〉中层。

[Objective]The research aimed to improve the accuracy of fertilization,reduce waste and protect agricultural resources and environmental quality. [Method] Based on the field sampling,GPS positioning and sample analysis,the data of physical and chemical properties of soil samples was obtained. By the support of SPSS and GS ＋,the methods of statistical analysis and correlation analysis were used. UganKuqa river delta oasis cotton soil was study objects,and the correlation analysis was made between soil organic matter and salinity,spatial correlation. [Result] The average content of soil organic matter in the study area was 15. 81- 17. 65 g / kg,and salt was 3. 17- 3. 42 g / kg. The coefficient of variation of organic matter was 13. 87%- 16. 19%,and the coefficient of variation of salt was 57. 10%- 61. 99%. Relevant characteristics of organic matter and soil salt ions in each soil lay was different,and in the middle of its soil and Mg2 ＋had a significant negative correlation. Spatial auto correlation analysis showed that the spatial structure of organic matter was better than the whole salt. And they in any soil layer had little differences. [Conclusion]The organic matter variation coefficient of different soil layers in surface layer of research area was 16. 19%,middle layer was 13. 87% and bottom layer was14. 28%. The variation of surface organic matter was the biggest,followed by bottom layer,and middle layer was the smallest. the variation coefficient of salt ions in different soil layers had the difference,and characteristic rule weren＇t obvious. Organic matter and HCO3-,Cl-,SO2-4,Ca2 ＋and K＋＋ Na＋salt ions had different degrees of correlation in the surface and middle layer,but it wasn＇t obvious. The contents of organic matter in the surface,middle and bottom soil were 8. 58%,6. 29%and 6. 09%,showing the decreasing trend. The content of salt in the soil surface,middle,and bottom was 3. 32,3. 42 and 3. 21 g / kg. The content was very little. The order of fractal dimension of organic matter was middle layer bottom layer surface layer. The order of spatial fractal dimension of total salt in different soil levels was bottom layer surface layer middle layer.