Stair-Step Slope Restoration with Coir Geotextile and Plant Synusia
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Solution Overview
Problem
Abandoned ion-absorbed rare earth mining areas in South China face severe soil erosion and ecological degradation due to poor soil structure, high salt content, and lack of vegetation, with existing restoration technologies being ineffective in rainy regions.
Innovation Solution
A three-dimensional restoration method involving a stair-step shaped slope structure with ecological water-harvesting ponds, intercepting ditches, and an improved soil layer embedded with a soil restoration ecological network, utilizing a combined plant synusia system and biological soil-fixing materials to enhance soil fixation and plant growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional plant restoration methods are used in abandoned rare earth mining areas, then vegetation coverage may be improved, but soil erosion control fails due to poor soil structure and water retention capacity
Solution Approach 1:
The restoration method segments the soil structure into multiple functional layers: protective layer (straw/wood chips for erosion control), water retention layer (coir geotextile for moisture conservation), and soil layer (amended with organic fertilizer). This layered segmentation addresses both erosion control and water retention issues that single-layer methods fail to solve.
Solution Approach 2:
The method uses composite materials combining natural fibers (straw, wood chips, coir geotextile) with chemical amendments (lime, organic fertilizer) to create a multi-functional restoration system. The coir geotextile serves as both structural support and water retention medium, while the straw layer provides both protection and organic matter, solving the contradiction between simple application and effective erosion control.
2Quantity of substance
If soil amendment with organic fertilizer is applied, then soil fertility improves, but water retention capacity remains insufficient in the degraded soil
Solution Approach 1:
The coir geotextile acts as an intermediary material between the soil and the protective layer. It has high water retention capacity while allowing water infiltration and root penetration. This intermediary layer captures and holds water that would otherwise drain quickly through the degraded soil, directly addressing the water retention deficiency while working synergistically with the organic fertilizer-amended soil.
Solution Approach 2:
The method employs porous materials including the coir geotextile with its network of pores and channels, and the loose straw/wood chip protective layer. These porous structures create capillary action to retain water while allowing air and water movement, solving the water retention problem without compromising soil aeration or creating waterlogging.
3Duration of action of stationary object
If slope restoration is attempted in rainy regions, then ecological recovery may occur, but soil erosion intensifies during rainstorm season
Solution Approach 1:
The method applies preliminary anti-action by installing the protective layer (straw and wood chips) and water retention layer (coir geotextile) before vegetation establishment. These pre-installed layers provide immediate erosion protection during rainstorms before plants take root, preventing soil loss that would occur during the vulnerable early restoration period. The protective layer absorbs raindrop impact and reduces surface runoff velocity, countering the harmful erosive forces of rainstorms in advance.
4Productivity
If vegetation is planted directly on degraded soil, then plant growth may occur, but survival rate is low due to soil acidification and salt residues
Solution Approach 1:
The method performs preliminary soil preparation actions before planting: applying lime to neutralize acidification, adding organic fertilizer to improve soil structure and fertility, and installing protective and water retention layers. These preliminary actions create a favorable soil environment that reduces plant stress from acidification and salt residues, thereby improving survival rates while supporting healthy growth.
Solution Approach 2:
The method changes key soil parameters through amendment: pH is adjusted by lime application to counteract acidification, organic matter content is increased through fertilizer addition to improve structure and water retention, and salinity is diluted through water management by the coir geotextile. These parameter changes transform the degraded soil into a more suitable medium for plant establishment, improving both survival and growth.
Data Source
AI summary
A structure and method for three-dimensional restoration of slope soil in an abandoned ion-absorbed rare earth mining area, belonging to the field of ecological restoration technologies. The structure for three-dimensional restoration of slope soil in an abandoned ion-absorbed rare earth mining area provided by the present invention includes an ecological water-harvesting pond, ecological intercepting ditches, an improved soil layer laid on the surface of a to-be-restored slope region and a soil restoration ecological network disposed on the improved soil layer. The improved soil layer, the ecological water-harvesting pond and the ecological intercepting ditches are each provided with a combined plant synusia system. The restoration structure provided by the present invention can effectively improve an extremely degraded ecological environment of the abandoned ion-absorbed rare earth mining area caused by tailings waste land and restore the degraded or polluted mining area soil and environment caused by mine destruction during rare earth mining.