Research on the Reduction Function of Ecological Ditches on Runoff Pollution from Rice Field in the Pearl River Delta

doi:10.16258/j.cnki.1674-5906.2022.09.016

Ecology and Environment ›› 2022, Vol. 31 ›› Issue (9): 1856-1864.DOI: 10.16258/j.cnki.1674-5906.2022.09.016

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Research on the Reduction Function of Ecological Ditches on Runoff Pollution from Rice Field in the Pearl River Delta

HAO Beibei¹^,²(), WANG Nan¹^,², WU Haoping³, ZHOU Zhixin⁴, ZHANG Siyi¹^,², HE Bin¹^,²^,^*()

1. Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management/Institute of Eco-environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, P. R. China
2. National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangzhou 510650, P. R. China
3. Guangdong Key Laboratory of Ornamental Plant Germplasm Innovation and Utilization/Environmental Horticulture Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, P. R. China
4. Zhongkai University of Agriculture and Engineering, College of Resource and Environment, Guangzhou 510225, P. R. China

Received:2022-05-07 Online:2022-09-18 Published:2022-11-07
Contact: HE Bin

生态沟渠对珠三角稻田径流污染的削减功能研究

郝贝贝¹^,²(), 王楠¹^,², 吴昊平³, 周智鑫⁴, 张思毅¹^,², 贺斌¹^,²^,^*()

1.广东省科学院生态环境与土壤研究所/广东省农业环境综合治理重点实验室,广东广州 510650
2.华南土壤污染控制与修复国家地方联合工程研究中心,广东广州 510650
3.广东省农业科学院环境园艺研究所/广东省园林花卉种质创新综合利用重点实验室,广东广州 510640
4.仲恺农业工程学院资源与环境学院,广东广州 510225

通讯作者: 贺斌
作者简介:郝贝贝（1985年生）,女,副研究员,博士,研究方向为面源污染防治与水环境修复。E-mail: bbhao@soil.gd.cn
基金资助:
国家自然科学基金项目(42177065);国家自然科学基金项目(52000041);国家自然科学基金项目(41977010);广东省重点研发计划(2020B1111530001);广东省科技计划项目(2020B1212060048)

Abstract

Abstract:

It is of great significance for the prevention and control of agricultural non-point source pollution to study the nitrogen and phosphorus interception effects of different types of ecological ditches in practical applications. In this study, four ecological ditches with different tectonic types and plant configurations were selected to study their purification effects on the drainage of rice fields. These ecological ditches were transformed from conventional agricultural unlined earthen ditches and cement ditches, located in an ecological agriculture base in Guangzhou. Results showed that, due to the influence of rainfall events, water quality of different monitoring sections of ecological ditch changed significantly before and after rainfall. The contents of NH₄⁺ and NO₃^- in different sections of the ditch increased slightly along the flow direction during the rainfall period, but decreased along the direction of water flow after rain. The results of one-way ANOVA showed that the purification effects of ecological ditches on NH₄⁺ and DO in runoff water were significantly different among the four ecological ditches with different tectonic types and plant configurations (P<0.05). In addition, two ecological ditches with the same plant configuration and different tectonic types (with and without perforated bricks on slope) were selected to further compare their purification effects on non-point source runoff pollutants such as nitrogen, phosphorus and COD. Results showed that the contents of NH₄⁺, NO₃^-, TN, TP and COD in the two ecological ditches decreased gradually from the inlet to the outlet. By comparing the reduction rates of runoff pollutant in the two ecological ditches, it was found that the average reduction rates of NH₄⁺, NO₃^-, TN, TP and COD in the ecological ditch with perforated bricks (28%, 50%, 30%, 54% and 41%) were higher than those in the ecological ditch without perforated bricks (26%, 25%, 23%, 33% and 27%). In conclusion, compared with the ecological ditch without perforated bricks, the ecological ditch with perforated bricks in this study had a better purification effect on non-point source pollutants. Therefore, selecting the appropriate type of ecological ditches in the process of ecological transformation of ditches will effectively improve their ability to intercept agricultural non-point source pollution.

Key words: ecological ditch, farmland drainage, non-point source pollutants, removal efficiency

摘要：

探讨不同类型生态沟渠在实际应用中的径流氮磷拦截效应,对农业面源污染防治具有重要意义。以广州增城生态农业基地内生态化改造后的4条沟渠为研究对象,分析比较不同构造类型和植物配置方式对稻田排水截留净化效果的影响。结果表明：受降雨事件影响,生态沟渠不同监测断面的水质变化特征在降雨前后发生显著变化。沟渠不同断面水体NH₄⁺和NO₃^-含量,在降雨发生期间沿水流方向略有增加;而降雨结束后沿水流方向呈现降低趋势,表现出一定的污染物削减效果。单因素方差分析结果表明,构造类型和植物配置方式不同的4条生态沟渠对径流水体NH₄⁺和DO的净化效果存在显著差异（P<0.05）。进一步选择植物配置方式相同但构造类型不同的两种生态沟渠（素土生态沟渠和多孔砖生态沟渠）,深入比较其对氮、磷和COD等面源径流污染物的削减效果发现：由入口到出口断面,素土生态沟渠和多孔砖生态沟渠水体氮、磷和COD含量均呈逐步下降趋势,多孔砖生态沟渠对水体NH₄⁺、NO₃^-、TN、TP和COD的平均削减率（28%、50%、30%、54%和41%）均高于素土生态沟渠（26%、25%、23%、33%和27%）。综上,相比素土生态沟渠而言,该研究中多孔砖生态沟渠对面源污染物净化效果更佳。因此在进行农田沟渠生态化改造时,因地制宜选择合适的生态沟渠类型,可有效提高其对面源径流污染物的拦截净化效果。

关键词: 生态沟渠, 农田排水, 面源径流污染物, 去除效率

CLC Number:

HAO Beibei, WANG Nan, WU Haoping, ZHOU Zhixin, ZHANG Siyi, HE Bin. Research on the Reduction Function of Ecological Ditches on Runoff Pollution from Rice Field in the Pearl River Delta[J]. Ecology and Environment, 2022, 31(9): 1856-1864.

郝贝贝, 王楠, 吴昊平, 周智鑫, 张思毅, 贺斌. 生态沟渠对珠三角稻田径流污染的削减功能研究[J]. 生态环境学报, 2022, 31(9): 1856-1864.

Figures/Tables 8

References 32

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沟渠编号 Ditch number	构造类型 Tectonic types	断面尺寸 Cross-sectional size	沟渠长度 Ditch length/m	沟渠坡面植物配置 Plant configurations on slope	沟渠底部植物配置 Plant configurations on bottom
ED₁	坡面素土夯实, 沟底挖平	底宽2.6 m, 高1.1 m, 坡度1:1.25	88	美人蕉 (C. indica) 和再力花 (T. dealbata), 种植密度16-18 plant∙m^-2	苦草 (V. natans), 种植密度50-60 plant∙m^-2
ED₂	坡面素土夯实, 沟底挖平	底宽2.6 m, 高1.0 m, 坡度1:1.25	120.5	美人蕉 (C. indica)和再力花 (T. dealbata), 种植密度16-18 plant∙m^-2	荷花 (N. nucifera), 种植密度4-5 plant∙m^-2
ED₃	坡面素土夯实后平铺菱形多孔砖, 沟底挖平	底宽2.6 m, 高1.1 m, 坡度1:1.25	92	美人蕉 (C. indica) 和再力花 (T. dealbata), 种植密度16-18 plant∙m^-2	苦草 (V. natans), 种植密度50-60 plant∙m^-2
ED₄	坡面素土夯实后平铺菱形多孔砖, 沟底挖平	底宽2.5 m, 高1.1 m, 坡度1:1.25	140	紫芋 (C. tonoimo) 和再力花 (T. dealbata), 种植密度16 plant∙m^-2	黄花水龙 (J. stipulacea), 种植密度20-25 plant∙m^-2

沟渠编号 Ditch number	构造类型 Tectonic types	断面尺寸 Cross-sectional size	沟渠长度 Ditch length/m	沟渠坡面植物配置 Plant configurations on slope	沟渠底部植物配置 Plant configurations on bottom
ED₁	坡面素土夯实, 沟底挖平	底宽2.6 m, 高1.1 m, 坡度1:1.25	88	美人蕉 (C. indica) 和再力花 (T. dealbata), 种植密度16-18 plant∙m^-2	苦草 (V. natans), 种植密度50-60 plant∙m^-2
ED₂	坡面素土夯实, 沟底挖平	底宽2.6 m, 高1.0 m, 坡度1:1.25	120.5	美人蕉 (C. indica)和再力花 (T. dealbata), 种植密度16-18 plant∙m^-2	荷花 (N. nucifera), 种植密度4-5 plant∙m^-2
ED₃	坡面素土夯实后平铺菱形多孔砖, 沟底挖平	底宽2.6 m, 高1.1 m, 坡度1:1.25	92	美人蕉 (C. indica) 和再力花 (T. dealbata), 种植密度16-18 plant∙m^-2	苦草 (V. natans), 种植密度50-60 plant∙m^-2
ED₄	坡面素土夯实后平铺菱形多孔砖, 沟底挖平	底宽2.5 m, 高1.1 m, 坡度1:1.25	140	紫芋 (C. tonoimo) 和再力花 (T. dealbata), 种植密度16 plant∙m^-2	黄花水龙 (J. stipulacea), 种植密度20-25 plant∙m^-2

指标 Indicators	自由度 d.f.	F值 F value	P值 P value
r_(DO)	3	7.081	0.002
r_(NH4+)	3	25.200	<0.001
r_(NO3-)	3	3.015	0.054
r_(pH)	3	2.712	0.077
r_(EC)	3	0.864	0.479

指标 Indicators	自由度 d.f.	F值 F value	P值 P value
r_(DO)	3	7.081	0.002
r_(NH4+)	3	25.200	<0.001
r_(NO3-)	3	3.015	0.054
r_(pH)	3	2.712	0.077
r_(EC)	3	0.864	0.479

Research on the Reduction Function of Ecological Ditches on Runoff Pollution from Rice Field in the Pearl River Delta

生态沟渠对珠三角稻田径流污染的削减功能研究

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