Study On Adaptability Of Seven Ground Covers In The Special Base Material Of Green Slope

The ecology compatibility of plants used in green slope is directly related to the display of landscape function and ecology function of virescence projects, which is an important attribute of restoring the side slope ecosystem and improving ecological environment. Taking Festuca arundinace, Medicago sativa, Zoysia japonica, Lolium perenne, Trifolium repens, Sedum spurium and Hemerocallis fuava as the research objects, the growth characteristic, drought resistance and anti-rain wash ability of the senen ground covers were studied in the special base material of green slope. Choosing the main evaluating indexes and establishing the compatibility evaluation system of side slope plants, the compatibility evaluation of the plants was carried on with analytic hierarchy process determining weight. The results were as follow:Firstly, the germinative capacity of the seven plant was as follows: Sedum spurium'Coccineum'> Hemerocallis fuava> Medicago sativa> Lolium perenne> Trifolium repens> Zoysia japonica> Festuca arundinacea. The length of green time in a vegetative cycle was as follows: Sedum spurium'Coccineum'> Festuca arundinacea> Lolium perenne> Medicago sativa> Hemerocallis fuava> Trifolium repens > Zoysia japonica.Secondly, the average aboveground biomass of Medicago sativa on summer solstice (June 21st) was particularly higher than other plants, and the following was that of Festuca arundinacea and Trifolium repens. But there was no significant diference between Zoysia japonica, Sedum spurium'Coccineum', Hemerocallis fuava, and their average aboveground biomass was far lower than that of the other three. On autumnal equinox (September 23rd), the average aboveground biomass of Medicago sativa was particularly higher than other plants, and the following was that of Festuca arundinacea and Zoysia japonica.During the time from summer solstice to autumnal equinox, the transverse increase of aboveground biomass in unit area of Zoysia japonica was the most,while that of Trifolium repens was the least. On summer solstice, the underground biomass of Festuca arundinacea, Medicago sativa, Hemerocallis fuava was significantly higher than other plants. On autumnal equinox, the underground biomass of Hemerocallis fuava was significantly higher than other plants, and the following was that of Festuca arundinacea and Medicago sativa. Compared with the time of summer solstice, the underground biomass of the seven plants had great increase than on autumnal equinox.Thirdly, the drought resistance was as follows: Sedum spurium'Coccineum'> Zoysia japonica > Festuca arundinacea > Hemerocallis fuava> Medicago sativa > Lolium perenne > Trifolium repens.Fourthly, the anti-rain wash ability under the same degree of coverage was as follows: Zoysia japonica> Trifolium repens> Sedum spurium'Coccineum'> Lolium perenne > Festuca arundinacea> Medicago sativa > Hemerocallis fuava.Fifth, taking plant emergence rate, drought resistance, cover speed, winter hardiness,ground biomass,underground biomass, ages, landscape effect, green time, construction cost and maintenance cost as variables, compatibility evaluation system of side slope plants was established, through which the adaptability evaluation and quality grades division of the seven ground covers were carried on. The results suggested that the quality grade of Zoysia japonica was good with the highest score of 7.6, while that of Medicago sativa, Festuca arundinacea, Sedum spurium'Coccineum'and Hemerocallis fuava was moderate. However, the quality grade of Trifolium repens was worst with the lowest score.