不同磷石膏掺量对植被混凝土基材肥力和狗牙根生长的影响研究

Effects of Different Phosphogypsum Dosages on the Fertility of Vegetation-compatible Concrete Substrate and the Growth of Bermudagrass

探究不同磷石膏掺量对植被混凝土基材肥力和狗牙根生长的影响,以为植被混凝土基材配方的改良提供借鉴.以磷石膏为原料进行室外种植试验,对植被混凝土基材掺入不同比例的磷石膏,对比分析各处理的基材肥力和植物生物量的变化特征.结果表明:不同磷石膏掺量对植被混凝土基材肥力有不同程度的影响.其中以S1(1∶1)处理时,基材容重、pH减小,基材有机质、碱解氮、速效磷和速效钾含量增加,植物生物量提高.以S2(1∶2)和S3(0∶1)处理会恶化土壤结构、降低土壤肥力,减小植物生物量.植物生物量与基材养分之间存在不同的相关性关系,不同的基材肥力条件对植物生物量的主要影响因子也有所不同.综合考虑,合适的磷石膏掺量可以显著优化基材肥力,提高植物生物量,建议掺入磷石膏的比例为润智生态改良剂:磷石膏为1∶1.

The effects of different phosphogypsum content on the fertility of vegetation concrete and the growth of bermudagrass were studied to provide reference for the improvement of vegetation concrete substrate formula.In this study,phosphogypsum was used as the raw material in the outdoor planting experiment,and different proportions of phosphogypsum were added to the vegetation concrete substrate.The variation characteristics of substrate fertility and plant biomass of each treatment were compared and analyzed.The results showed that different dosage of phosphogypsum had different effects on the fertility of vegetation concrete substrate.When treated with S1(1∶1),the bulk density and pH of the substrate decreased,the contents of organic matter,alkaline hydrolysis nitrogen nitrogen,available phosphorus and available potassium in the substrate increased,and the plant biomass increased.S2(1∶2)and S3(0∶1)treatments could deteriorate soil structure,reducing soil fertility and plant biomass.There were different correlations between plant biomass and substrate nutrients,and the main influencing factors of different substrate fertility conditions on plant biomass are also different.Overall,this study suggested that the appropriate phosphogypsum content could significantly optimize the base material fertility and improve plant biomass.It was suggested that the proportion of phosphogypsum added is Runzhi ecological modifier∶phosphogypsum=1∶1.