黑河流域不同土地利用类型下水体N,P质量浓度特征与动态变化

通过对黑河流域中游地区11年在不同河流断面的长期监测和区域内不同土地利用类型下不同水体,如地下水、泉水、水库水和河流水的空间选点取样分析,来研究干旱区不同土地利用类型下水体N,P等植物营养元素的质量浓度特征与动态变化特征.河水与浅层地下水TP,NH4-N和NO3-N质量浓度均呈沿流域出山口至下游地区显著增加,同时还具有明显的季节变化趋势及随时间递增趋势.不同的土地利用类型对径流中氮素质量浓度有明显的影响,林地面积比例增加使径流水中氮素质量浓度明显减少,而绿洲农田面积成比例增加,氮素变化规律则呈相反趋势.对日趋严重的水体N,P污染问题提出一些建议.

The figures of content and dynamical changes of N and P under different forms of land use in the Heihe River Basin

The great amount of N, P nutrient elements in every kind of water bodies in the research region proves the point we can analyse the figures of the content and special dynamical changes of plant nutrient elements N and P in several kinds of water bodies, such as the content of N, P in water bodies under different forms of the use of the land by 11 years' long-term observation on the typical profile of the Heihe Rivers basin and selective sampling analysis on underground water, spring water, reservoir water and river water on. The plant nutrient elements N and P in water bodies under different forms of the use of land. The founding is that the content of TP, NH4-N and NO3-N in river and shallow underground water increase markedly from the mountain outlet to the lower reaches of the river while the obvious tendency of change with the seasons and times increasing. Different forms of the use of land greatly affect the content of nitrogen in the runoff. The expanding of the forest area decrease the content of nitrogen in the runoff while the increase of oasis cropland increases it proportionately. In addition, this article puts forward some suggestion on the serious pollution of N, P in water bodies.