不同沙土配比根系层土壤的持水特性研究

因地制宜地配置不同沙土比例的根系层是运动场草坪场地建造中最为关键的技术之一。试验将沙土配比设为11个处理,即沙/(沙+土)从0～100kg100kg-1,每10kg100kg-1为一个梯度,并采用压力膜法研究了不同沙土配比土壤的持水特性。结果表明,公式θ=AS-B能较好地拟合不同沙土配比土壤的水分曲线,所得方程均达到了极显著(0.001)水平;随含沙量增加,土壤脱湿曲线逐渐下移,表明同一土壤吸力条件下,土壤含水量随含沙量增加逐渐降低;根据土壤比水容量出现10-2级的先后顺序,11个配比土壤的供水能力可归结为三类。水分有效性受配比土壤的颗粒组成影响呈现出不同的变化规律,且与颗粒粒级的相关性显著。

Effect of Different Sand/soil Ratio on Soil Water-holding Characteristic of Sports Turf Rootzone

Selecting a reasonable rootzone is one of crucial technology for construction of sport turf.The experiment designed 11 sand/soil ratioes,from 0 to 100kg 100kg-1 sand/(sand+soil).The plots were constructed within 1×1×0.5m3 polyethylene boxes supported by legged,metal framework.The soil water-holding characteristics were researched though pressure-membrane mothed.The results showed that water characteristic curves of different sand/soil ratio rootzones could be regressed evidently by power function θ=AS-B(P=0.001).With sand content increasing,soil water content reduced and water characteristic curves droped gradually at same soil suction.According to the appearing sequence of 10-2 level of Cθ,the water supplying capability of 11 treatments were divided three groups.Validity of soil water were affected remarkably by mechanical composition of mixing rootzone and showed different changes rule.