生态环境学报2024，Vol.33Issue(11)：1727-1736,10.DOI:10.16258/j.cnki.1674-5906.2024.11.007
农田排水沟植物配置对底泥粒度特征及碳氮磷去除效果的影响
Influence of Plant Configuration on Sediment Size and the Removal of Carbon,Nitrogen and Phosphorus in Agricultural Drainage Ditches
摘要
Abstract
Controlling and reducing pollutant concentrations in agricultural runoff is crucial for preventing and mitigating eutrophication in irrigated areas and water bodies.The farmland drainage ditch serves as the primary watercourse for farmland runoff.In order to reveal the validity and efficiency of plant species in purifying water quality in farmland drainage ditches,three plant configuration patterns,including the Phragmites australis pattern(Ditch-1),the Phragmites australis+Typha orientalis pattern(Ditch-2),and the Phragmites australis+Typha orientalis+Nymphaea tetragona,Myriophyllum verticillatum,Scirpus validus pattern(Ditch-3)were set up in three independent farmland drainage ditches in Ningxia Yellow River Diversion Irrigation District of China.The effects of these plant configuration patterns on sediment particle composition,particle size parameters,and carbon(C),nitrogen(N),and phosphorus(P)contents were investigated.The results showed that the sediments in the studied farmland drainage ditches were classified as silt loam,characterized by a high silt content and the lowest proportion of clay particles.The average particle size ranged from 5.20Φ to 6.07Φ,indicating poor sorting performance characterized by nearly symmetrical and positively skewed skewness,moderate and narrow kurtosis,a fractal dimension of 2.19-2.63,and coarse texture.The plant configuration significantly altered the particle composition and size parameters of the sediments.With an increase in the number of plant species and coverage,the volume ratios of silt and clay significantly increased,but the volume ratio of sand significantly decreased.In addition,there was a significant increase in the particle size parameters and fractal dimension with an increase in plant species and coverage.The frequency curve of sediment particle size showed a unimodal pattern in Ditch-1 and Ditch-2,and bimodal pattern in Ditch-3.The grain size probability accumulation curve was predominantly influenced by saltation components,and the cumulative volume proportion of suspended components was significantly higher in Ditch-3 than in Ditch-1 and Ditch-2.The composition of the sediment particles exerted a significant influence on the contents of C,N and P in sediment.Among these factors,fractal dimension and clay were identified as pivotal drivers of variations in C,N,and P contents in the sediment.Plant configuration significantly influenced the adsorption,fixation,and decomposition of C,N,and P in sediments by affecting their particle composition and size parameters.Ditch-2 exhibited the highest levels of C,N,and P adsorption and fixation in the sediment,whereas Ditch-3 showed the most pronounced decomposition and reduction of these elements.This study suggested that multiple-species plant configurations could be employed in farmland drainage ditches to effectively mitigate hydrodynamic conditions,optimize sediment particle composition and size parameters,and bolster the purification capacity of agricultural runoff and sediments.关键词
宁夏引黄灌区/农田排水沟/底泥粒度/植物组成/覆盖度/碳氮磷Key words
Ningxia Yellow River diversion irrigation area/farmland drainage ditch/sediment particle size/planting configuration/coverage/carbon,nitrogen,and phosphorus分类
农业科技引用本文复制引用
何紫琪,方晰,洪瑜..农田排水沟植物配置对底泥粒度特征及碳氮磷去除效果的影响[J].生态环境学报,2024,33(11):1727-1736,10.基金项目
宁夏回族自治区重点研发计划项目(2022BEG02007) （2022BEG02007）
宁夏自然科学基金项目(2022AAC03447) （2022AAC03447）
