Publication date: 1 February 2016
Source:Geoderma, Volume 263
Author(s): Jianhua Ren, Xiaojie Li, Kai Zhao, Bolin Fu, Tao Jiang
The Songnen plain in China has a typical soda-saline soil that frequently shrinks and cracks under natural conditions during water evaporation. Contrast (CON) is a typical gray level co-occurrence matrix (GLCM) texture feature, which can well represent the cracking degree of dried soil surface and is highly related with the salt content of soda-saline soils. In order to make a quantitative analysis of the effects of salt content on the cracking behavior of soda-saline soils, laboratory controlled and field verification experiments on the soda-saline soil of the Songnen plain were conducted in the present study. The laboratory experiment included 56 samples and was conducted to establish the relationships between the CON values of laboratory-generated crack patterns of soil samples and some primary salt parameters, such as the electrical conductivity (EC), Na+ content, Cl− content, CO3 23 − content and total salinity. The field verification experiment included 48 samples and was conducted to establish the relationships between the CON values of field-generated crack patterns of soil samples and the salt parameters. For both laboratory experimental samples and field samples, the CON values were computed from the binary images of the cracked patterns and were significantly linearly correlated to the EC, Na+ content and salinity (coefficient of determination [R2] >3 23 − content showed very poor prediction accuracy (R2
Source:Geoderma, Volume 263
Author(s): Jianhua Ren, Xiaojie Li, Kai Zhao, Bolin Fu, Tao Jiang