A Preliminary Study on the Community Structureof Tropical Cultured Grassland

A study was conducted on the influence of grazing and non-grazing on the community structure of cultured quadrennial tropical grassland. The result shows that the cultured grassland with Stylosanthes guianensis cv.Reyan 2 and Brachiaria brizantha as the dominant species boasts higher yield of biomass and nutrient value. The annual hay yield of the non-grazing cultured grassland is 8096 kg/hm~2,and that of the grazing cultured grassland,6324.5 kg/hm~2;the former is 116.04% higher and the latter 68.77% higher than that of the non-grazing and grazing natural grassland.The yield ascends with the changing seasons, reaching the highest in October. The herbage output rises among grasses of 11～40 cm height. Grazing decreases herbage output and frequency of S.guianensis cv. Reyan 2, yet increases those of B.brizantha cv.Reyan 6 and S.hmata . Tropical cultured grassland consititutes a reasonable structure and distribution of forage species.