Study On Components Proportion And Physical And Chemical Properties Of Sand-based Turf Bed Of Sports Field

The sports turf is a kind of special function lawn constructed in the ball games and athletics field. In order to meet the needs of sports, it must withstand high strength trampling frequently. This requests the turf bed of sports field with strong surface firmness, good water permeability, high draining speed and compaction resistance ability, so as to provide the good playing quality, and meet the needs of turfgrass growth.Currently there are several sports turf construction methods such as the USGA (United States Golf Association) construction method, the PAT (Prescription Athletic Turf System) construction methods, the New Pennsylvania design method, are used internationally, which the sand is used as the main material. Compared with the traditional field soil based sports field, the sand-based sports field provides the better drainage and compaction resistance performance. Because of the large particle size, broad particle size distribution, different shapes of sand particles, the sand-based sports field usually has poor water retention ability and nutrient holding capacity. Therefore certain proportion of other matter such as peat or zeolite is mixed to the sand-based turf bed in order to adjust its physical and chemical properties. There are many differences in bed thickness, profiles, structure, and particle size distribution with the construction methods above. All of them have their advantages and disadvantages. At present, researches on components, physical and chemical properties of sand-based turf bed are not well documented in our country. A standard sports turf construction method, which is suitable to the domestic actual situation, is urgently needed. In this research, the water characteristics of four sand-based profiles with different particle size distribution and the influences of different clay content, different peat or zeolite contents on the physical and chemical properties of sand-based turf bed, as well as the influence of these changes on the turfgrass quality were studied. The result shows:(1) Water characteristics of sand-based profile are important factors that affect sports turf quality, the more fines, the better water holding capacity in the same height of profile, especially coarse sand (1.0mm～0.5mm)and medium sand (0.5mm～0.25mm)which influenced on turf bed moisture release curve and the water characteristics greatly. A stable perched water table (PWT) at the middle of sand-based profile was maintained and...