广西大学 林学院 广西森林生态与保育重点实验室广西高校亚热带人工林培育与利用重点实验室, 广西 南宁 530004
于芳(1997—),女(瑶族),广西壮族自治区河池市人,硕士研究生,研究方向为自然保护地管理与生态修复技术。Email:yfang97626@163.com。
杨钙仁(1976—),男(汉族),广西壮族自治区贵港市人,博士,教授,主要从事森林生态水文与水质效应、面源污染生态修复、生态农业等方面的研究。Email:yanggr@gxu.edu.cn。
收稿:2024-12-04,
修回:2025-01-26,
纸质出版:2025-06-10
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于芳, 杨钙仁, 邓汶, 等.城市公园海绵型绿地土壤有机碳含量特征及其影响因素[J].水土保持通报,2025,45(3):268-277.
Yu Fang, Yang Gairen, Deng Wen, et al. Characteristics of soil organic carbon content and influencing factors in sponge green spaces of urban parks [J]. Bulletin of Soil and Water Conservation,2025,45(3):268-277.
于芳, 杨钙仁, 邓汶, 等.城市公园海绵型绿地土壤有机碳含量特征及其影响因素[J].水土保持通报,2025,45(3):268-277. DOI: 10.13961/j.cnki.stbctb.2025.03.026. CSTR: 32312.14.stbctb. 2025.03.026..
Yu Fang, Yang Gairen, Deng Wen, et al. Characteristics of soil organic carbon content and influencing factors in sponge green spaces of urban parks [J]. Bulletin of Soil and Water Conservation,2025,45(3):268-277. DOI: 10.13961/j.cnki.stbctb.2025.03.026. CSTR: 32312.14.stbctb. 2025.03.026..
目的
2
研究城市海绵型绿地土壤固碳特征及其影响因素,为城市绿地规划与管理提供科学依据。
方法
2
以南宁市3个公园的海绵型(雨水花园、净水梯田、植草沟3种样式)与常规型(常规乔灌草复层绿地、常规草坪2种样式)绿地为对象,分析两大类型各种汇集径流碳氮磷含量、绿地凋落物现存量以及0—20 cm土层土壤有机碳含量。
结果
2
①海绵型绿地的汇水面积/绿地面积比值以及源自径流输入的有机碳和氮磷量均大于常规型绿地;海绵型与常规型绿地间凋落物现存量无显著差异。 ②除雨水花园0—5 cm土层土壤自然含水量显著高于其他样式绿地外,海绵型各样式绿地0—5 cm土层土壤的自然含水量、容重和孔隙度与常规型绿地的差异未达到显著水平。 ③雨水花园、植草沟0—20 cm土层土壤有机碳平均含量分别为7.73和10.69 g/kg,分别为常规型乔灌草复层绿地和草坪的1.33和2.20倍;净水梯田的土壤有机碳含量与常规型乔灌草复层绿地无显著差异;海绵型绿地土壤有机碳含量随建成年限增长呈不断增加趋势,汇水面积/绿地面积、径流碳磷含量、凋落物有机碳含量等是海绵型绿地土壤有机碳含量的主要影响因子。
结论
2
海绵化改造有利于城市绿地土壤固碳,通过外部径流输入汇集更多有机碳是海绵型绿地土壤碳增汇的主要机制。
Objective
2
The characteristics of soil carbon sequestration and its influencing factors of urban sponge green space were analyzed to provide a scientific basis to urban green spaces and urban green space planning and management.
Methods
2
Three parks in Nanning City were selected as study sites, focusing on sponge-type green spaces (rain gardens, water purification terraces, and grass swales) and conventional green spaces (multilayered tree-shrub-grass green spaces and conventional lawns). The carbon, nitrogen, and phosphorus contents in runoff collected from the green spaces, the existing litter stock, and the soil organic carbon content in the 0—20 cm soil layer were analyzed.
Results
2
① The ratio of catchment area to green space area and the amounts of organic carbon, nitrogen, and phosphorus inputs from runoff were greater in sponge-type green spaces than in conventional green spaces. However, there was no significant difference in litter stocks between sponge-type and conventional green spaces. There were no statistically significant differences in the natural water content, bulk density, or porosity in the 0—5 cm soil layer between sponge-type and conventional green spaces. ② Except for the natural water content in the 0—5 cm soil layer of rain gardens, which was significantly higher than that of other types of green space. ③ The average soil organic carbon content in the 0—20 cm soil layer of rain gardens and grass swales was 7.73 g/kg and 10.69 g/kg, respectively, which was 1.33 and 2.20 times that of conventional multilayered tree-shrub-grass green spaces and lawns, respectively. The soil organic carbon content of water purification terraces showed no significant difference from that of conventional multilayered green spaces. The soil organic carbon content of sponge-type green spaces increased with age of the green space. The ratio of catchment area to green space area, carbon and phosphorus content in runoff, and organic carbon content in litter were the main factors influencing soil organic carbon content in sponge-type green spaces.
Conclusion
2
Sponge-type transformation was beneficial for soil carbon sequestration in urban green spaces. The primary mechanism for increased soil carbon sequestration in sponge-type green spaces is the collection of more organic carbon through external runoff.
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