Effects of Several Special Soil Types on Root Production of Trees
In agricultural production, soil plays a crucial role in the production of tree roots. Adequate soil nutrients, good ventilation conditions, changes in underground structures, and trace element composition all affect the development and production of crop roots. . In practice, we can use the root analyzer to accurately measure and analyze the roots of the trees. The root analyzer can automatically measure the length, projected area, surface area, volume, etc., of each diameter, and their distribution parameters.
As mentioned above, different conditions of the soil play an important role in root production. Then the following analysis will be conducted to analyze the effect of several specific soil types on the root production of the trees.
1 River seawall soil
The compact seawall soil has to some extent limited the growth and development of the roots of the trees, resulting in the particularity of the roots of the seawall trees. Lu Yishan et al. (1994) found that the root system of tree roots has unique distribution characteristics on seawalls. The horizontal root system consists of two or three major lateral roots, and the coastal bank stretches toward the roots. About 2m in width, there are few lateral roots extending vertically to the center of the seawall, mainly consisting of several medium-thick root systems that strive for balanced development.
Ji Yonghua et al. (1998) found that the roots of the trees in the river bank are affected by small terrain and have unique morphological features: they are generally distributed in the upper part of the bank, and the lower part is less. In addition to the constraints imposed by the competition of adjacent roots on both sides, the extension is More freedom. That is to say, the chicken/claw shape is distributed along the slope surface; Robinia pseudoacacia and Cypress are the roots with drooping roots, Metasequoia, Chinese fir and eucalyptus are the roots with oblique roots, and Willow, Cypress and Peach are horizontal root systems. Compared with the root system of forest trees, the roots of the tree bank of the river bank have the characteristics of central root system and shallow average root system. Therefore, it is recommended to use afforestation with high root system and strong clay-holding abilities such as Metasequoia and eucalyptus trees on slopes of riverbanks where soil and water loss is easy, and use peach trees and cypresses which have economic value and beautifying effect on the green ridges of river banks. Tree species such as afforestation.
2 compaction of soil
The texture and structure of the soil play an important role in root growth. In the vast literature on the influence of wild tourism on forest ecological environment, many scholars commented on the growth and distribution of soil structure damage and roots. Hildebrand (1986) in Germany studied the effect of soil structure degradation on the root development of the 2a seedlings of Norway spruce. It was found that with the deterioration of soil structure, the fine root development became worse and the roots were unevenly distributed in the soil. He believes that the root development is obviously related to the aeration conditions of the soil.
KopoTae BA (1992) pointed out that the root growth rate of trees is inversely proportional to the soil density; the critical solidity of the root growth of trees varies from species to species: Siberian larch, European red pine, and European spruce are 1184g#cm-3 and 1172g1cm respectively. 3 and 1161g 1cm-3. He also confirmed that the absorption of phosphorus and potassium in seedlings grown on compact soils is also reduced. In view of the adverse effects of degraded soil structure on the growth of tree roots, afforestation sites with hard disks are often dealt with in afforestation practices to promote the extension of roots to deeper soils.
3 Urban street soil
Li Jiale believes that the ground and underground conditions of street trees and ancient trees in famous areas in many cities in China are detrimental to the growth of trees.
Li Wanqiao et al. (2003) analyzed the causes of yellowing of ginkgo trees in some streets of Shenyang City. It was found that poor soil conditions and damaged roots were the underlying causes of the yellowing of Ginkgo biloba. After investigation, it was found that the content of sand and gravel in the rhizosphere soil of the yellow plants was very high, and even the planting site was originally an asphalt road. The planting pits dug on the asphalt road surface were small and the amount of soil exchanged was small. Due to the poor rhizosphere soil conditions, low fertility, and weak soil conservation, the plant roots are poorly developed and the growth potential is weak, which reduces the resistance to adverse climatic conditions.
4 Barren and desolation soil
Wang Wenquan et al. (1994) found that the roots of peat-pulverized coal recovered from the fields of Yang, Liu, Cang and Robinia pseudoacacia on plowed ground were found to have a distribution as compared with the same type of trees grown on shajiang black soil. The characteristics of deep, large quantity, and high density are also deeper than the dense distribution of roots of similar trees growing on sandy land. The root systems of Europe, America, Salix miltiorrhiza, Bletilla striata, and Robinia pseudoacacia were able to adapt to the condition of pulverized coal to restore field conditions. The roots grew and developed normally in fly ash with the characteristics of straight growth and bending. According to division criteria for the root type by Shi Qing et al., under the site conditions and cultivation conditions, the genus Salix is ​​obliquely rooted in the compound root type, and the remaining three tree species are horizontal root types.
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