Old-growth Ficus trees provide soil water and carbon storage to urban greenspaces in a Brazilian metropolis

IF 3.9 Q2 ENVIRONMENTAL SCIENCES
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Abstract

Urban flooding has been considered one of the most severe natural disasters around the world, and urban greenspaces can provide important flood regulation ecosystem services. In Belo Horizonte (Brazil), the woody vegetation, especially the old-growth Ficus trees, appears to protect an urban park against the flooding of the Arrudas river. Thus, we compared the soil water content, soil water-holding capacity, soil aggregation and porosity among a highly permeable urban park planted with herbaceous and woody species, including Ficus, a semi-permeable parking lot with only Ficus and an impermeable site without trees (Disturbed Site-DS). The soil water content and water holding capacity of the urban park did not differ from that of the Ficus site, but it was lower than DS. These results were correlated with soil organic matter (SOM) content, soil aggregation and porosity, suggesting that Ficus trees play an important role in the hydrological cycle. To understand how the Fiscus species provide such soil permeability, we compared the aboveground plant biomass, soil fertility and soil carbon sequestration (total soil carbon, soil organic matter, humic and fulvic acids and soil isotopic δ13 C) in plots with Ficus and without this species within the park as well as in a preserved urban forest and a disturbed square. The outstanding plant biomass produced by Ficus species explained the high soil carbon sequestration, particularly in humic organic matter, favouring soil aggregation, porosity and water retention. Therefore, Ficus species may be considered an exceptional C-sequestering species, contributing for soil stabilization and the hydrological cycle in urban greenspaces.
古老的榕树为巴西大都市的城市绿地提供土壤水分和碳储存
城市洪水一直被认为是全球最严重的自然灾害之一,而城市绿地可以提供重要的洪水调节生态系统服务。在巴西贝洛奥里藏特,木本植被,尤其是古老的榕树,似乎可以保护城市公园免受 Arrudas 河洪水的侵袭。因此,我们比较了一个种植了草本和木本植物(包括榕树)的高渗透性城市公园、一个只种植了榕树的半渗透性停车场和一个没有树木的不渗透场地(扰动场地-DS)的土壤含水量、土壤持水量、土壤团聚度和孔隙度。城市公园的土壤含水量和持水能力与种植榕树的场地没有差别,但低于 DS。这些结果与土壤有机质(SOM)含量、土壤团聚度和孔隙度相关,表明榕树在水文循环中发挥着重要作用。为了了解榕树是如何提供这种土壤渗透性的,我们比较了公园内有榕树和没有榕树的地块以及受保护的城市森林和受干扰的广场上的地上植物生物量、土壤肥力和土壤固碳量(土壤总碳量、土壤有机质、腐殖酸和富勒酸以及土壤同位素δ13 C)。榕树物种产生的出色植物生物量解释了土壤固碳量高的原因,特别是腐殖质有机物,有利于土壤聚合、多孔性和保水性。因此,榕树可被视为一种特殊的固碳树种,有助于城市绿地的土壤稳定和水文循环。
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来源期刊
City and Environment Interactions
City and Environment Interactions Social Sciences-Urban Studies
CiteScore
6.00
自引率
3.00%
发文量
15
审稿时长
27 days
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