农业工程学报Issue(3)：213-224,12.DOI:10.3969/j.issn.1002-6819.2013.03.029
海南省南渡江新坡河塘底泥养分状况及重金属污染评价
Characteristic of nutrients and evaluation of heavy metal contamination on sediments among Xinpo pond, Nandu river in Hainan province
摘要
Abstract
Sediment, the major reservoir of contaminants in a lake, contains not only hazardous matter, but also nutrients like nitrogen, phosphorus, and organic matter. So the detoxification, recycling and reuse of sediment has been widely studied. Agricultural land use of sediment is a potentially feasible approach for contaminated site remediation and can achieve good economic and environmental benefits. The key concept is to control the pollutant content and soil burden according to the related environmental standards. Heavy metals reserved in agricultural soil would greatly affect the grain yield and quality, as well as food safety, and are one of the major environmental pollution sources threatening human health. In this article, the sediment content in Xinpo Pond of the Nandu River Valley was;total phosphorus content was in the range of 0.1097 to 2.3108 g / kg with a mean of 1.1824 g/kg;total potassium content fell in the range of 2.3000 ~ 16.8000g/ kg with a mean of 9.3000 g/kg;and the organic matter content fell in the range of 22.7195 to 167.8769 g / kg with a mean of 92.9408 g/kg. Mean values of total nitrogen and total phosphorus at the lower reach outweighed those at the upper reach by 32.45% and 11.88%, respectively, while total potassium and organic matter content at the lower reach were lower than those at the upper reach by 14.64% and 14.62%, respectively. The variation coefficient of nutrient data from the upper reach sediment were generally higher than those from the lower reach sediment, resulting from the flow rate, ambient natural environment and farming activities. Total nitrogen, total phosphorus, and organic matter reached level 1 (abundant), and the total potassium content was in level 5 (scarce). From evaluation of sediment nutrient based on t;their exceeding magnitudes were 58.45%, 104.58%, 6.06%, and 68.48%. Heavy metal contamination resulted from the fact that the soil parent materials are mafic volcanic rocks, which caused high background values of the metals in the soil. Heavy metals in the soil were flushed by acid rain into the pond through surface runoff. From the Nemerow Index evaluation, the sediment was mainly slightly polluted (46.15%of the samples) to moderately polluted (28.21% of the samples). Contamination of the sediment was also spatially distributed, among which 62.05% of the site was at the slightly contaminated level (level 3) and 25.80% of the site was at the moderately contaminated level (level 4). The watercourse at the lower reach was wider and the flow rate was slow, increasing the rate of sediment de关键词
底泥/养分/重金属/空间格局/污染评价Key words
sediments/nutrients/heavy metals/spatial distribution/contamination evaluation分类
资源环境引用本文复制引用
刘永兵,贾斌,李翔,吴军,孟萍,洪文良,赵从举..海南省南渡江新坡河塘底泥养分状况及重金属污染评价[J].农业工程学报,2013,(3):213-224,12.基金项目
海口市土地储备整理中心科技项目:河道底泥在土地整治工程中的资源化应用技术开发研究 （）
南渡江土地整治工程中底泥农业利用工程示范 （）
国家自然基金项目(40961033) （40961033）
十二五国家科技支撑计划课题(2012BAC09B03) （2012BAC09B03）
