植被混凝土基材微生物活性对不同水泥含量的响应

Responses of Microbial Activities in Vegetation-Concrete Substrate to Different Cement Contents

以常用护坡草本生长下的植被混凝土基材作为研究对象,选择脲酶、转化酶、碱性磷酸酶、微生物量碳、微生物量氮做为因子,对样地土壤生物活性指数(SBAI)做了综合计算,研究了不同水泥含量对植被混凝土基材生物活性的影响。结果表明,水泥的添加会降低基材生物活性,低水泥浓度样地土壤生物活性指数相对较高;相同水泥含量梯度下,对照样地比狗牙根样地、紫花苜蓿样地的土壤生物活性指数低。植物在一定程度上能够改善土壤生物的活性水平。

Impacts of cement content on soil biological activities in vegetation-concrete substrate are dis- cussed. By taking vegetation-concrete substrate covered by common revetment herb as the study object, the soil biological activity index（SBAI） is calculated based on experimental data of urease, invertase, alkaline phosphatase, microbial biomass carbon and microbial biomass nitrogen. Results indicate that adding cement can reduce soil biological activities and the SBAI was at a higher level with low cement content. Under the same gradient of cement content, the SBAI of unmanaged samples is obviously lower than managed samples covered by Cynodon dactylon and Medicago sativa L. , which shows that plants can improve the level of soil biological activities to a certain extent.