Improvement method for underground soil of urban street trees on coastal saline and alkaline land region

Abstract

The invention relates to an improvement method for underground soil of urban street trees on a coastal saline and alkaline land region, mainly aiming at the improvement of an underground salt elimination system and street tree root growth spaces of a street tree region which is built for many years. The method comprises the following steps that (1) sidewalk saline soil, concrete and sidewalk pavement on the outer sides of the street tree region are removed, and original saline soil is replaced with soil dressing; (2) a dn60PVC (polyvinyl chloride) vent pipe is paved in a plant root system concentrated distribution layer, the paving mode is a horizontal wave mode, two ends of the vent pipe penetrate through the original street trees by a certain angle, the two ends are 2-3cm higher than a greenbelt, a dn60PVC leaky pipe is deeply paved in the original street tree leached layer, non-woven fabric is used for coating the outer side of the leaky pipe, and the leaky pipe is connected with a salt elimination inspection well of the underground salt elimination system of the original street tree region. By using the improvement method, the growth and sustainable development of the street trees can be guaranteed, and the ecological benefits of the street trees can be fully exerted.

Description

technical field [0001] The invention relates to a method for improving soil in saline-alkali land, which is mainly aimed at limiting factors such as soil saline-alkali, high groundwater level, and tight soil quality in coastal muddy saline-alkali areas, as well as the deficiencies of traditional methods. . Background technique [0002] Street trees refer to trees that are planted on both sides of the road to shade vehicles and pedestrians and form a street view. They have certain intervals. Occupying an important position in the urban green space system, the quality of a city street tree directly affects the ecological function and overall image of the city, and is also related to the quality of life of the people. In coastal silty saline-alkali areas, urban street tree greening not only has common characteristics such as soil compaction, human activities, no layers, and reduced biological activity in general urban green spaces, but also is affected by soil salinity, poor s...

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Problems solved by technology

[0003] At present, the common methods of urban greening in coastal saline-alkaline areas mainly include cushion method, blind pipe method, spraying layer plus blind pipe and other forms. The cushion method is more effective in the initial stage, but it does not relieve the impact of street tree soil from groundwater, nor does it solve soil salinity. The problem of the way out, blind pipe or blind pipe + spraying layer can solve the problem of groundwater and soil salinity well, but the problem of nutrient space for the root system of street tree plants has not been well solved, that is, street tree plants often grow in a place with a width of 1 meter and a depth of about 1 meter. In the planting trough, the two sides are either original saline soil with high salt content and high soil compaction, or one side is roadbed treatment and concrete or asphalt pavement for road construction, and the other side is saline soil and a certain layer of composite soil. The limitations of these methods for laying floor tiles mainly include: ① high soil compaction, which leads to difficulty in desalination, and brings salt hazards to the growth of plant roots; ② high soil compactness hinders the interspersed growth of plant roots; ③ concrete, asphalt or floor tiles Reduce the aeration and water infiltration capacity of the soil; ④The use of composite soil can easily lead to alkalization of the soil in the planting tank, etc. These factors make the street trees often have rotten roots, salt damage, poor growth, and even death.

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