Anikwe M A N, Nwobodo K C A
Department of Agronomy, Faculty of Agriculture, Enugu State University of Science and Technology, India.
Bioresour Technol. 2002 Jul;83(3):241-50. doi: 10.1016/s0960-8524(01)00154-7.
An assessment on the impact of long term (20 years) municipal waste disposal on soil physicochemical properties and soil productivity in municipal waste dump sites was carried out in urban Abakaliki, southeastern Nigeria. Profile pits were dug at selected points and auger and core samples were collected from different soil horizons of dump and non-dump sites using free survey technique to choose observation points. There were differences in particle size distribution between dump and non-dump sites. Similarly, soil bulk density was lower by 9-13% while total porosity and hydraulic conductivity were higher by 9-14% and 240-463%, respectively, in the dump site relative to non-dump sites. Soil organic matter, total nitrogen, cation exchange capacity (CEC) and percent base saturation increased from 701 to 743, 646 to 740, 7% to 10% and 5% to 14%, respectively, in the dump site soil relative to non-dump site soil. These results were confirmed by a high coefficient of alienation (degree of unrelatedness, square root(1 - R2)) in bulk density, 0.65; total porosity, 0.58; hydraulic conductivity, 0.87; organic matter, 0.93; total N, 0.82; pH, 0.85 and cation exchange capacity, 0.97 between dump and non-dump soils. Heavy metals (Pb, Cu, Fe and Zn) increased by between 214% and 2040% in dump site soils relative to non-dump site soil. This may lead to increased uptake of metals by some test crops although their transfer ratios differ from crop to crop. Long term dumping of municipal wastes can influence soil properties and productivity at municipal waste dump sites but still may be used for farming provided that ecotoxological risks associated with its usage are continuously assessed and controlled.
在尼日利亚东南部城市阿巴卡利基，对城市垃圾填埋场长期（20年）的垃圾处理对土壤理化性质和土壤生产力的影响进行了评估。在选定地点挖掘剖面坑，并采用自由调查技术选择观测点，从垃圾填埋场和非垃圾填埋场的不同土壤层采集螺旋钻和岩芯样本。垃圾填埋场和非垃圾填埋场的粒径分布存在差异。同样，与非垃圾填埋场相比，垃圾填埋场的土壤容重低9 - 13%，而总孔隙度和水力传导率分别高9 - 14%和240 - 463%。相对于非垃圾填埋场土壤，垃圾填埋场土壤中的土壤有机质、全氮、阳离子交换容量（CEC）和碱饱和度百分比分别从701增加到743、646增加到740、7%增加到10%和5%增加到14%。这些结果通过垃圾填埋场和非垃圾填埋场土壤之间在容重（疏离系数为0.65）、总孔隙度（0.58）、水力传导率（0.87）、有机质（0.93）、全氮（0.82）、pH值（0.85）和阳离子交换容量（0.97）方面的高疏离系数（不相关程度，平方根(1 - R2)）得到证实。相对于非垃圾填埋场土壤，垃圾填埋场土壤中的重金属（铅、铜、铁和锌）增加了214%至2040%。这可能导致一些受试作物对金属的吸收增加，尽管它们的转移率因作物而异。城市垃圾的长期倾倒会影响城市垃圾填埋场的土壤性质和生产力，但只要持续评估和控制与其使用相关的生态毒理学风险，仍可用于耕种。
