Soil health and carbon storage in community gardens in the Perth metropolitan area, Australia

IF 5 3区 农林科学 Q1 SOIL SCIENCE Soil Use and Management Pub Date : 2024-03-07 DOI:10.1111/sum.13033
Haochen Zhao, James O'Connor, Sarah Zou, Zakaria M. Solaiman, Bede S. Mickan, Nanthi Bolan
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Abstract

Community gardens, as common spaces where people gather to grow food, help foster public health, greener urban environments, life-long learning and vibrant communities. However, despite being promoted as sustainable horticulture and conservation agriculture, their soil health and carbon (C) sequestration potential, with implication for climate change mitigation, remains underexplored. This study assessed soil samples collected from raised beds (gardening area) and adjacent bare ground (control) at six community gardens in the Perth metropolitan area, Australia. These sites covered three soil mapping units (SMUs): calcareous deep sands, coloured sand and pale sands The soil in raised beds exhibited superior characteristics than surrounding urban soil including lower bulk density, higher pH buffering capacity, available nutrients including nitrogen (N), phosphorus (P) and potassium (K), cation exchange capacity (CEC), total C and microbial biomass. Notably, we estimated that raised bed soils accumulated significant levels of C in the top 10 cm layer (0.55 kg/m2 or 5.5 T/ha). Our findings also indicate no significant heavy metal contamination in any of the community garden soils. Although the global area of community gardens is marginally small, these results suggest they hold potential for carbon sequestration, especially in urban and peri-urban environments. The improved soil health and C storage potential in community garden soil are largely attributed to the regular application of compost produced within the community gardens.
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澳大利亚珀斯大都市区社区菜园的土壤健康与碳储存
社区菜园作为人们聚集在一起种植食物的公共空间,有助于促进公共卫生、营造更绿色的城市环境、终身学习和充满活力的社区。然而,尽管社区菜园被宣传为可持续园艺和保护性农业,其土壤健康和碳(C)固存潜力以及对减缓气候变化的影响仍未得到充分探索。本研究评估了从澳大利亚珀斯大都会区六个社区花园的高架花坛(园艺区)和邻近裸地(对照区)采集的土壤样本。与周围的城市土壤相比,高床土壤具有更优越的特性,包括更低的容重、更高的 pH 缓冲能力、包括氮(N)、磷(P)和钾(K)在内的可用养分、阳离子交换容量(CEC)、总碳和微生物生物量。值得注意的是,我们估计高床土壤在顶部 10 厘米层积累了大量的 C(0.55 千克/平方米或 5.5 吨/公顷)。我们的研究结果还表明,所有社区菜园土壤中都没有明显的重金属污染。虽然全球社区菜园的面积很小,但这些结果表明它们具有固碳的潜力,尤其是在城市和城郊环境中。社区菜园土壤健康状况的改善和碳储存潜力的提高主要归功于定期施用社区菜园生产的堆肥。
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来源期刊
Soil Use and Management
Soil Use and Management 农林科学-土壤科学
CiteScore
7.70
自引率
13.20%
发文量
78
审稿时长
3 months
期刊介绍: Soil Use and Management publishes in soil science, earth and environmental science, agricultural science, and engineering fields. The submitted papers should consider the underlying mechanisms governing the natural and anthropogenic processes which affect soil systems, and should inform policy makers and/or practitioners on the sustainable use and management of soil resources. Interdisciplinary studies, e.g. linking soil with climate change, biodiversity, global health, and the UN’s sustainable development goals, with strong novelty, wide implications, and unexpected outcomes are welcomed.
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