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A method for rapid desalination and alkali reduction of coastal heavy clay saline soil
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A saline soil and heavy sticky technology, applied in the field of soil science, can solve problems such as poor soil quality and restrictions on the sustainable development of greening, and achieve the effects of convenient operation, low improvement cost and high efficiency
Active Publication Date: 2019-07-16
TIANJIN TEDA GREEN GRP CO LTD
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[0005] To improve heavy clay soil into greening planting soil, it is first necessary to improve its permeability and increase its infiltration capacity in order to quickly desalinize and reduce alkalinity, which limits the sustainable development of greening in this area due to poor soil quality
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Embodiment 1
[0025] In 2015, this method of desalination and alkali reduction was applied in the "Binhai New Area Duliujian River and Yongding Xinhe Raw Soil Improvement Project". This project is a raw soil improvement project. The resulting saline soil has high salt content, heavy soil quality and poor structure, as shown in Table 1. The specific implementation steps are as follows:
[0026] Table 1: Soil physical and chemical indicators on March 23 before construction in 2015
[0027]
[0028] The inventive method comprises the steps of:
[0029] 1).Salt drainage in the project: According to the design, lay reverse planing grooves and bury salt drainage pipes. The distance between the pipes is 4 meters, and the buried depth of the pipes is 1.0 meters.
[0030] 2) Add improvement reagents: the first step is to mix solid aluminum sulfate in the soil body, add and mix by 0.8% of the soil weight of the planting layer (according to the depth of 100cm), and use mechanical mixing to mix eve...
Embodiment 2
[0037] 1. Improved leaching experiment: We used plastic pots to fill saline soil, each pot weighed 900 grams, selected coastal saline soil, with a salt content of 2.14%, pH8.37, and set CK (the control was saline soil), and the concentration of aluminum sulfate was 0.8 %, 1.0%, polymaleic acid 0.6%, Hekang improver concentration 1.0%, 1.2%, a total of 5 treatments, each treatment repeated 5 times. The amount of reagents according to different treatments was evenly mixed with the soil and then filled into pots, with 900g of soil in each pot. After the soil sample is filled, the aluminum sulfate is solid and mixed according to the above dosage, and the other is liquid, weighed according to the dosage, diluted with water to 600mL and added to each pot to make the reagent fully react with the soil. After 12 hours of water drenching, measure the soil index and meet the requirements, see the table below.
[0038]2. Lawn sowing experiment: Sow 1g of ryegrass seeds per pot and observ...
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Abstract
The invention relates to a method for quick desalting and alkalinity reducing of coastal heavy-viscidity saline soil. The method includes following steps: 1), underground desalting: arranging a concealed pipe desalting system underground of the coastal saline soil according to design conventional requirements; 2), adding a modifying reagent: doping solid aluminum sulfate into soil, using water to dilute polymaleic acid to prepare a solution, adding the solution from a water inlet of irrigation water, and combining with flood leaching to slowly pour into the soil; 3), performing flood leaching; 4), applying organic matter and / or organic fertilizer. The method is convenient to operate and reduce alkalinity while desalting, so that requirements on greening planting soil are met; the method is high in efficiency and is performed during engineering construction, so that no delay is caused to construction period; modifying cost is low, the saline soil can be modified into greening planting soil the same year, so that acting the same year is realized while modifying the same year, and engineering cost of the method is not higher than that of a mode of borrowed soil replacement for coastal saline-alkaline land.
Description
technical field [0001] The invention belongs to the field of soil science, and relates to a technique for repairing soil, in particular to a method for improving heavy clay saline soil in coastal saline-alkali areas into green planting soil. Background technique [0002] Urban green space is an important symbol reflecting modern urban civilization and a good living environment. Increasing the coverage rate of urban green space, improving the structure of urban green space, scientifically operating and maintaining urban green space, and making it exert greater ecological and landscape benefits are important goals of modern city construction and management. Due to the poor soil quality and poor ventilation and water permeability of the green space in coastal saline-alkaline areas, the growth of plants is weak and dead, which seriously affects the sustainable development of green space construction and the maintenance of green space landscape. [0003] The characteristics of s...
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