Studies On The Mechanism Of Soil And Water Conservation And Its Benefit Of Eulaliopsis Binata

of biomass for below ground was higher than that of overground, and the ratio of overground and below ground biomass decreased. Just because of its great biomass, lash stems and leaves, great degree of land coverage and thick grass layer, Eulaliopsis binata prevented the direct scour of raindrop to soil and decreased the soil erosion; in the meantime, it adjusted microclimate environment of grassland. The distribution range of root system of Eulaliopsis binata is wide, and its flourishing fibrous roots interlocked into a net shape; the distribution of root system in upper soil layer is very intensive, and more than 90% of fibrous root was distributed in soil layer from 0 cm to 30 cm, so the ability of soil-fixation of Eulaliopsis binata is very strong, which reduced the dispersal degree of soil, enhanced stability and anti-scourability of soil body, furthermore, the interlock of root system improved soil physical and chemical properties, enhanced porosity and intensified soil permeability and water-retaining capacity.4. The effects that Eulaliopsis binata intercepted rainfall, decreased surface runoff, prevented and controlled soil erosion were quite obvious. The effects of Eulaliopsis binata planted on slope land of 20?,30?and 40?on preventing and controlling water loss and soil erosion were observed. The results showed that, compared with the bare land of the same gradient, three different slope gradients conditions decreased the surface runoff amount for 81.64%, 80.97%, 78.80% respectively, and decreased the soil erosion amount for 92.9%, 92.6%, 92.1% receptively, when the rainfall intensity was about 3.0mm/min and rainfall amount was 50mm. The study results came from three experiment places indicated that, compared with bare land, water-holding amount of Eulaliopsis binata land increased more than 14.92%; amplitude of soil-fixation amount per hectare Eulaliopsis binata was 0.105-0.246 ten thousand m3.