Effects of Soil Bulk Density on Root Composition The statistics of the root composition at a distance of 40 cm from the trunk indicate that the smaller value measured by the Soil Bulk Density Analyzer is conducive to the occurrence and growth of fine Cabernet Sauvignon, while the soil bulk density increases (1.25 g/cm3). ) Increase the number of coarse roots and coarse roots. The number of fine roots in the soil layer below 40 cm in Liugou Base is still relatively large, and the proportion of fine roots in the total soil layer is 81.5%, which is 1.2% and 9.2% higher than that of Magezhuang Base and Kangda Base respectively. The total gross root ratio was 17.7%, which was 2% lower than that of Magezhuang Base (19.7%) and 10% lower than that of Kangda Base (27.7%).
The density of the Liugou base is within the appropriate range. Therefore, the horizontal distribution of the roots is the widest. There are still 109 root distributions at 80 cm from the base, which are three times that of the Magezhuang base and 3.7 times that of the Kangda base. The Kangda base has the largest bulk density. There is a sticky layer below 40cm, the roots can not be tied down, forcing the root system to be distributed in more than 40cm soil layer. The soil bulk density tester showed a range of 1.05 to 1.25 g/cm3. There was a large amount of root distribution both horizontally and vertically. As the soil bulk density increased, the lateral extension of the roots became less, and the root volume reached 1.47 g/cm3. The amount was sharply reduced, and there was almost no root system after exceeding 1.65 g/cm3.
Soil bulk density has a significant effect on soil physical properties such as soil aeration, water holding capacity, and compactness. The experiments conducted by the Soil Bulk Densitometer showed that there was a positive correlation between the porosity of the soil and the bulk density, and a negative correlation between the porosity and the bulk density. Under low-consistency soil conditions, the roots were uniformly distributed in the longitudinal direction with a large number and the roots were thin and long; whereas in the high-concentration soils, the root system was short and the density was small.
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