Soil moisture recorder analysis of the role of urban greening technology
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Set up gravel, lawn (grass tadpoles), wheat straw, and sawdust to cover the tree trays. Control (CK) was not covered (open field), and 3 plants were treated. In the selected plant tree disk 50-V80c. The diameter range is coverage area, covering thickness is gravel thickness 7~8cm, wheat straw and sawdust cover thickness is 8~10cm. The test starts from mid-June 2007, and it measures 0~5cm every 5 days. Soil layer, 18~20cm. The soil temperature of the soil (recorded in the afternoon at 18'00) was measured simultaneously with 18-}-20c. Soil moisture soil moisture recorder determination . In the month of 2008, samples were taken to determine soil organic matter content (0~10cm). Soil samples were made from soil samples and potassium dichromate method.
Different cover treatments, different growing tree discs 18^-20c. Soil humidity varies, ranging from 3% to 22%. The average soil moisture under crushed stone is smaller than that of the control. The average humidity under the turf cover is slightly lower than that of the control, which may be related to water consumption of turfgrass growth. The soil moisture covered by sawdust and straw is significantly higher than that of the control. Can play a significant moisturizing effect.
Organic cover can improve soil physical and chemical properties, prevent surface dust, regulate soil temperature and humidity, increase soil organic matter content, maintain soil moisture, control weeds, and increase crop yields. In agricultural production, there are applications. However, different covering materials and methods have different effects. The results of this experiment show that the cover changes the heat exchange of the soil; among them, wood chip coverage, wheat straw mulching, and turf cover treatment have a strong ability to adjust the soil temperature: in the higher surface temperature period, the cover can block the hot mouth. To avoid the continuous increase of soil temperature, but also to a certain extent, reduce the soil temperature. During periods of low surface temperature, the cover can also slow down the temperature drop of the soil and even increase the soil temperature, reducing the damage of the extreme soil temperature to the roots of the trees. Under the cover of wood chips and wheat straw, the soil water retention effect is better. The cover has the ability to accumulate rainwater, and can prevent moisture from being transported along the soil capillary to the ground to be evaporated, which can save water and retain water. Wood chips and wheat straw cover can increase soil organic matter content, and then increase soil fertility.
The comprehensive analysis of the results of soil moisture measurement by soil moisture recorders shows that straw mulching and wood chips cover well, the ability to adjust soil temperature and maintain soil moisture is strong, and soil organic matter content can be significantly increased, and the cost is low. , environmental protection, it is recommended to apply in production.