Study On The Slope Protection Of Turf Grass

Aiming at the current problems of soil erosion and slope protection system imperfect,this research took Cynodon dactylon and Zoysia matrella which are common used in Hunan area as study object. This research made a systematic study on the hydrological effect of stems and leaves and the mechanics effect of the roots. In order to provide a reference for eco-tea garden, this research evaluates the effect of slope protection from ecological adaptability, landscape and solid earth effects. The main research results are as follows:1 The hydro-ecological effects of stems and leavesFrom turning green since late March, all the turf grass keeping rapid growth until reaches their stead maximum. The height and above-ground biomass of Cynodon dactylon in every treatment were bigger than Zoysia matrella, and the whole treatments were better than grid treatments. All the turf grass could significantly reduce the surface temperature and conserve the soil moisture, especially the whole treatments. Late July, the interception rates of the stems and leaves among every reatment were similar. But the Cynodon dactylon's interception amounts was bigger than Zoysia matrella, the whole treatment was superior to the grid treatment. The effective retaining-water rate of Zoysia matrella was bigger than Cynodon dactylon but the effective retaining-water amount was on the contrary which shows that Cynodon dactylon was bigger than Zoysia matrella, the whole treatment was bigger than the grid treatment.2 Biological characteristics and mechanical effect of rootsThe deepest roots of Cynodon dactylon are more than 31.28cm, the average roots diameter are more than 0.76mm, both of the characters of Cynodon dactylon are better than Zoysia matrella. The root weight of Cynodon dactylon was thicker than the same treatment of Zoysia matrella in 0～40cm soil. The proportion of effective root (≤1.00mm) of all the treatment was B>D>A>C. It shows that the two sorts of turf grass can effectively improve the stability of soil structure and increase soil water infiltration in the same time to increase soil erosion resistance. The average roots max. Tensile stress of Cynodon dactylon was 8.78N, the average roots tensile strength was 27.10MPa, Zoysia matrella were 8.31N; 22.75MPa. When the root diameter was same, the average roots max. Tensile stress and the tensile strength between the two sorts has slightly difference, but not significant. This discussion shows that the relation between the average root max. Tensile stress and the diameter was linear and positive, the formulas were as follows:Cynodon dactylon:Fr=10.033D+1.3832 (R2=0.9613) and Zoysia matrella:Fr= 9.2670D+1.4802 (R2=0.9454).The relationship between the roots tensile strength and roots diameter was index and negative. The formulas were as follows:Cynodon dactylon:Tr=88.270e-1.8151D (R2=0.9070),Zoysia matrella:Tr=65.238e-1.6154D (R2=0.8996)...