The Quantitative Relationship between Soil Structure and Moisture Content during Soil Dehydration Process

Based on the tracking test data of the soil bulk density and moisture contents of nine kinds of soils during soil dehydration process,the changes of soil bulk density with time were revealed in the process,and the quantitative relationship between soil bulk density and moisture content was analyzed.The results showed that there was a relatively close quadratic function correlation relationship between soil bulk density and moisture content;when moisture was above a certain value,soil bulk density increased gradually with the decreasing moisture content;however,when moisture was below the value,soil bulk density became smaller gradually with the decreasing moisture content,but the range of decreasing was less than that of increasing,and it was that under the combined effect of factors of irrigation and dehydration,soil bulk density increased.