摘要
为研究植被混凝土磷石膏含量对基材理化性质、植物根系性征及整株抗拔力的影响,进行了不同磷石膏掺量(0%、3%、4.5%、6%、9%)以及不同生长期(90、120、150 d)条件下,基材相关理化指标的测定、狗牙根根系监测和原位整株拉拔试验.结果表明:磷石膏对基材容重、pH 值和土壤磷含量具有显著影响;狗牙根根系网状结构显著增强了抗拔力,整株抗拔力随根系性状的改善而增大,3%掺量下抗拔力 120 d时高出 0%掺量 30.25%;适量磷石膏掺入显著促进了根系生长,3%掺量下根系总根长、根体积和根系生物量增加显著,此种情况下狗牙根根系固土效果最好.
Abstract
In order to study the effect of phosphogypsum content of vegetation concrete on the physicochemical properties of the substrate,plant root characteristics and the pull-out resistance of the whole plant,the determination of the physical and chemical indexes of the substrate,the root monitoring of bermudagrass and the in situ whole-plant pull-out test were carried out under different phosphogypsum content(0%,3%,4.5%,6%,9%)and different growth periods(90,120,150d).The results showed that phosphogypsum had a significant effect on bulk density,p H value and soil phosphorus content.The pull-out resistance was significantly enhanced by root reticulation of the bermudagrass,increasing with the improvement of root traits.The pull-out resistance at 3%phosphogypsum mixing dosage was 30.25%higher than that at 0%dosage at 120d.Appropriate amount of phosphogypsum significantly promoted the growth of root.The total root length,root volume and root biomass of the root system increased significantly at the 3%dosage,thus the root system of bermudagrass had the best soil consolidation effect in this case.
万方数据