论文部分内容阅读
以辽河流域典型种植区为研究区域,对其地下水硝态氮含量进行分析,为合理施肥及有效防控种植区地下水硝态氮含量超标提供理论依据。结果表明,辽河流域不同典型种植区地下水硝态氮含量差异明显,具体表现为花卉种植区(37.4 mg/L)>玉米种植区(22.3mg/L)>蔬菜种植区(21.9 mg/L)>水稻种植区(19.2 mg/L),各典型种植区地下水硝态氮含量除水稻种植区外都超标,但水稻种植区地下水硝态氮含量变异系数较大,有超标的风险;地下水硝态氮含量超标率差异也较明显,其中玉米种植区超标率为12.5%~87.5%,水稻种植区为9.4%~75.5%,蔬菜种植区为17.9%~58.9%,花卉种植区为21.4%~96.0%。另外,对于同一井深,不同种植区地下水硝态氮含量总体均表现为雨季前>雨季后。
Taking the typical planting area of Liaohe River Basin as the research area, the nitrate nitrogen content of groundwater was analyzed to provide a theoretical basis for rational application of fertilizers and excessive control of nitrate nitrogen content in groundwater. The results showed that there was significant difference in the nitrate nitrogen content of groundwater in different typical planting areas in Liaohe River Basin. The results showed that there were significant differences in the nitrate nitrogen content of groundwater in the typical planting areas of Liaohe River Basin, especially in the areas of flower planting (37.4 mg / L)> corn planting area (22.3mg / L)> vegetable planting area In the paddy planting area (19.2 mg / L), the nitrate nitrogen content of groundwater in all the typical planting areas exceeded the standard in all except the rice planting areas. However, the variation coefficient of nitrate nitrogen content in groundwater in paddy planting areas was large with the risk of exceeding the standard. The exceeding standard rate of corn is also obvious. The exceeding rate of corn planting area is 12.5% -87.5%, that of rice planting area is 9.4% -75.5%, that of vegetable planting area is 17.9% -58.9%, that of flower planting area is 21.4% -96.0% . In addition, for the same well depth, the nitrate nitrogen content of groundwater in different planting areas generally showed that before the rainy season> after the rainy season.