Study On Sponge Benefits Of Different Plants And Their Substrates

The international term of "sponge city" is"construction of low impact development rainwater system",abbreviated to "LID",which is a hot topic at present.Jiaxing City in Zhejiang Province ranks among the first batch of national sponge city construction pilot cities,providing a reliable test platform for in-depth exploration of sponge city.At present,the research on sponge city is still in a broad level.In this paper,five kinds of plants are selected from the early sponge city of Jiaxing City,Zhejiang Province,which are Agapanthus africanus Hoffmgg.Vetiveria zizanioides(L.).NashIris ensata Thunb.Miscanthus sinensis Andress 'Zebrinus'.Ilex cornuta var fortune,and three common soil allocation modes(40%sand+20%peat soil+current planting soil,mixed with net)in sponge city Water plant sludge particles 40%+peat soil 20%+current planting soil,mixed with ceramsite 40%+peat soil 20%+current planting soil)through penetration test,root scanning,nutrition classification,biomass measurement,relevant experimental data are obtained,and through SPSS data analysis software(variance test,correlation test,linear regression equation),data indicators of five plants are obtained,which is to build a sponge city.The main research results are as follows:(1)Permeability of three kinds of matrix:the relationship of infiltration velocity of three kinds of matrix under unsaturated condition is:sample plot 3?sample plot 1?sample plot 2,among which sample plot 1 and sample plot 3,sample plot 2 and sample plot 3 have obvious differences There are no significant differences in the permeability of the three matrixes under saturation.There is "peak cutting and valley filling" in the soil permeability of plants(different plants have different effects on soil permeability,some soil dense plants play the role of dredging to speed up plant permeability;when the soil loose plants play the role of soil fixation.Among them,the change of planting soil plants in sample plot 1 is less obvious,sample plot 2 plants dredge the soil,and sample plot 3 plants fix the soil.)Phenomenon.(2)Different plant permeability:the blank control has significant differences in the white lotus,jade Chan flower,mottled awn,vetiver and Acanthus,and the blank control permeability is respectively higher than the single permeability of five plants.Plants have influence on the infiltration of sponge city.(3)There were significant differences in nutrient contents of different substrates:total nitrogen,total phosphorus and organic carbon.There are no significant differences in the contents of three nutrients between the substrate plants and the blank control.(4)There are significant differences among different plants in the same substrate.The results show that the above ground and underground parts of the white lotus have the highest nutrient content,and the vetiver is the lowest.(5)The above ground and underground parts of plant biomass are correlated.The above ground and underground parts of white lotus meet the linear regression equation y=1.3x+0.51(R2?0.7529),and the binary equation y=3.74x2+0.27x+0.035(R2=0.7692).The linear equation y?0.686x+0.114(R2?0.756)and quadratic equation y=0.316x2+0.209x-0.005(R2=0.770)are satisfied for Yuchan flower.The linear equation y?-3.173x+0.741(R2=0.817)and the quadratic equation y=2.67x2+0.19x+0.006(R2=0.858)are satisfied for the above and underground of Xianggen grassland.In the future experiments,the three plants only need to measure any value of X and y,which greatly improves the efficiency of the experiment.