坪床质地对杂交狗牙根草坪恢复能力的影响

Effect of Different Soil Texture of Turf-bed on the Recovery Capability of Hybrid Burmudagrass Turf after Trample

以长江水洗沙（粗沙和细沙）与田园土组合为坪床，杂交狗牙根百慕大T一419品种建植草坪，采用模拟践踏器对草坪进行破坏性践踏，通过测定土壤和草坪指标，研究不同坪床质地处理对草坪的恢复能力的影响。结果表明：践踏后，随着沙含量的增加土壤通透性得到改善，75％～100％粗沙及50％～100％细沙处理土壤总孔隙度均大于40％；含沙量为50％～100％处理株高增长率明显高于全土处理；50％～100％的粗沙处理和75％的细沙处理在恢复1个月后，分蘖数明显高于全土处理；全土处理的修剪量明显低于其他8个处理；综合考虑各因素，75％、i00％的粗沙处理、75％的细沙处理在高强度践踏后表现出很好的恢复能力，长江水洗沙按照该比例配比，适合于南京及周边地区应用。

The hybrid bermudagrass T 419 turf was established on the turf bed consisting of different proportions of Yangtze River washed sand （ including coarse sand and fine sand） and the local garden soil in 2007. The recovery capability of hybrid burmudagrass turf and the physical property of turf bed were studied through measuring soil bulk density, total porosity, growth rate of plant height, turf density and pruning biomass after it was devastatingly trampled by turf trampler. The results showed that under tram- ple stress, the bulk densities of 25~ fine sand and the treatment only with the soil increased significantly while the total porosity decreased significantly. The soil permeability was improved with the sand content increasing. The soil total porosities of 75%--100% coarse sand and75%fine sand treatments were greater than 40~, which was suitable for the growth of turf grasses. The hybrid bermudagrass of the treatments of the 50 %- 100 % coarse sand and 75%fine sand grew rapidly, and height growth rates were significantly higher than that of the treatment only with the soil. When the recovery stage reached over 30 days, the hybrid bermudagrass of the treatments of 50~70~ coarse sand and the 25% fine sand produced tillers quickly, and the turf density and the tiller number were significantly higher than that of the treatment only with the soil. The pruning biomasses of treatments containing sand were all significantly higher than that of the treatment only with the soil. Generally speaking, the hybrid bermudagrass of the treatments of 75%-100%coarse sand and 75% fine sand showed good recovery capability after heavy trample stress, which was suitable for application in Nanjing and the neighboring regions.