Effects of Urban Green Infrastructure Designs on Soil Bacterial Community Composition and Function
Effects of Urban Green Infrastructure Designs on Soil Bacterial Community Composition and Function
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DOI：
10.1007/s10021-022-00797-y
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发表时间：
2022-10
期刊：
影响因子：
3.7
通讯作者：
Liqing Li;Shun Li;Xue-ying Ma;Yuqing Yan
中科院分区：
文献类型：
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作者：
Liqing Li;Shun Li;Xue-ying Ma;Yuqing Yan
绿色基础设施是主要用于处理城市雨水径流污染的环境设计。绿色基础设施设计的影响与其土壤中的细菌组成和多样性有关。中国，本研究评估了地理信息系统设计对武汉城市土壤细菌群落组成和功能的影响。GI设计分为五种不同的类型：工程设计(道路生物步行道、雨水花园和下沉式绿地)和非工程设计(传统道路绿地和城市草坪)。工程土壤与GI设计与城市径流的连通性相结合，可以对细菌群落的组成和功能产生强烈的影响。在五种GI设计类型中，我们发现细菌群落的组成在门水平上由变形杆菌、酸性细菌、拟杆菌和放线菌主导。工程设计中变形杆菌和类杆菌的相对丰度显著高于非工程设计，在道路生物沟中最高。我们发现了9个与碳(3类)和氮(6类)循环有关的主要生态功能类群，它们在工程土壤中的相对丰度显著高于非工程土壤，特别是在道路生物沟和下沉式绿地中。与城市街道径流直接相关的道路生物沟具有最高的反硝化酶活性(DEA)。绿色基础设施的DEA与土壤有机碳、水分和全氮高度相关。与其他GI设计相比，道路生物沟似乎具有反硝化热点的功能，并具有更高的反硝化潜力。
Green infrastructures (GIs) are environmental designs mainly used to treat urban stormwater runoff pollution. The influences of green infrastructure designs are associated with the bacteria composition and diversity in their soils. This study evaluated the effects of GI design on the composition and function of urban soil bacterial communities in Wuhan, China. GI designs were divided into five different types: engineered (road bioswales, rain gardens, and sunken green spaces) and non-engineered (conventional road greenbelts and urban lawns) designs. The engineered soil combined with the connectivity to urban runoff of the GI design can have strong influences on bacterial community composition and function. Across the five GI design types, we found that the composition of bacterial communities was dominated byProteobacteria,Acidobacteria,BacteroidetesandActinobacteriaat the phylum level. The relative abundance ofProteobacteriaandBacteroidetesin the engineered designs was significantly higher than the non-engineered designs and was highest in road bioswales. We detected nine predominant ecological function groups related to the carbon (3 groups) and nitrogen (6 groups) cyclings, with their relative abundance in engineered soils significantly higher than those in non-engineered soils, especially in road bioswales and sunken green spaces. Road bioswales (RBS), with direct connection to urban runoff from street, had the highest denitrification enzyme activity (DEA). DEA of green infrastructures was highly correlated with soil organic carbon, moisture and total nitrogen. Road bioswales appear to function as denitrification hotspots and have higher potential denitrification than other GI designs.