Ground cover plant community construction method applicable to bioretention facility

[0053] Example 1:

[0054] Example 1 is located at the intersection of the main road and the auxiliary road in a residential area. The biological retention facility belonging to Example 1 is part of the green separation belt, with an area of ​​about 80m 2 , Sunshine habitat type is Yangsheng (6h and above). The soil medium in the water storage area and buffer zone of the biological retention facility is a medium soil formed by mixing native soil, sandy soil and coconut bran (ratio 4:4:2), and the soil medium in the marginal area is native soil. Example 1 The site mainly collects direct precipitation and rainwater runoff from the main and auxiliary roads. The pollution situation is relatively serious. The main pollutants are: ammonium nitrogen compounds and phosphate compounds. Comprehensive assessment of the biological retention facility in Example 1 is a function-oriented type.

[0055] Water storage area 1 is planted with runoff pollution control dominant ground cover plant community, the layout is: rush (60%) + pennisetum (30%) + yellow calamus (20%) + iris (20%).

[0056] Buffer 2 is planted with runoff and rainwater interception and infiltration-promoting dominant ground cover plant communities. The layout is: Ligustrum lucidum (40%) + Pampas (30%) + Lythrum chinensis (30%) + Sedge grass (20%) ).

[0057] The marginal zone 3 is planted with landscape-dominant ground cover plant communities. The layout is: Dianthus (20%) + Scallion (20%) + Ophiopogon (20%) + Cypress (10%) + Douban boxwood (10%) %) + Nan Tianzhu (10%).

[0058] The plants are designed in layers. The first layer (ground cover): Laoyu grass, carnation, scallion, Ophiopogon japonicus; the second layer (seasonal theme layer): yellow calamus, iris, lythrum; third layer ( Structure layer): Nantian bamboo, watercress boxwood, Ligustrum lucidum, pampas grass, pennisetum, rush, paving cypress;

[0059] From March to October 2019, under laboratory conditions, the habitat conditions of the biological retention facility were simulated, and the fabricating method described in Example 1 was implemented in a small area. The TPY-6A soil nutrient rapid tester (Zhejiang Top Yunnong Technology Co., Ltd.) was used to test the ammonium nitrogen and available phosphorus content in the soil. By artificially simulating rainfall, the weight ratio of the above-ground parts of plants before and after the rainfall is measured, and the rainwater interception rate in the canopy is calculated. Through observation, the relative abundance, relative frequency, and relative significance of plants are recorded, and after certain data processing, the stability of plants can be obtained. The results showed that compared with the blank control (outside the community), Example 1 increased the reduction rate of ammonium nitrogen content in the soil by 41.08%, and the reduction rate of available phosphorus content by 24.31%; the canopy rainwater interception rate increased by 6.86%; community stability Increase by 0.023.

[0060]

[0061] Example 2:

[0062] Example 2 is located near the main road of a certain city. The biological retention facility belonging to Example 2 is part of the road green space, with an area of ​​about 100m 2 , Sunshine habitat type is Yangsheng (6h and above). The soil medium in the water storage area and buffer zone of the biological retention facility is a medium soil formed by mixing native soil, sandy soil and coconut bran (ratio 4:4:2), and the soil medium in the marginal area is native soil. Example 2 The site mainly collects direct precipitation and rainwater runoff from surrounding roads and green spaces, and the pollution is slight. The biological retention facility to which Example 2 of the comprehensive assessment belongs is a landscape-oriented type.

[0063] Water storage area 1 planting landscape-dominant ground cover plant communities: Stipa tenuifolia (40%) + coreopsis (50%) + pennisetum (20%) + wintergreen (10%);

[0064] Buffer 2 is planted with landscape-dominant ground cover plant communities: sky blue sage (40%) + iris (20%) + skyren chrysanthemum (20%) + echinacea (20%) + Ganxi sage ( 20%);

[0065] The marginal zone 3 is planted with landscape-dominant ground cover plant communities: Prunus sibiricum (40%) + Scleros vulgaris (20%) + Ligustrum lucidum (20%) + Photinia (20%) + Holly (10%);

[0066] Design the plants in layers, the first layer (ground cover): Laoyu grass, Stipa tenuifolia; the second layer (seasonal theme layer): echinacea, coreopsis, sky blue sage, Ganxi sage , Ma Lin, Gaillardia, Peach grass; three layers (structure layer): Pennisetum, Holly, Ligustrum lucidum, Photinia

[0067] From March to October 2019, under laboratory conditions, the habitat conditions of the biological retention facility were simulated, and the fabricating method described in Example 2 was implemented in a small area. By artificially simulating rainfall, the weight ratio of the above-ground parts of plants before and after the rainfall is measured, and the rainwater interception rate in the canopy is calculated. Through observation, the relative abundance, relative frequency, and relative significance of plants are recorded, and after certain data processing, the stability of plants can be obtained. The results showed that compared with the blank control (outside the community), Example 2 increased the canopy rainwater interception rate by 9.82%; the community stability decreased by 0.004.

[0068] project Canopy rainwater interception rate (%) Community stability Example 2 31.03 0.929 Blank control 21.21 0.933