平原感潮河网地区不同土地利用下营养盐迁移特征

摘要

A typical agricultural watershed and runoff plots of plain areas in Nantong were selected for experimental research. Different land uses in the watershed were investigated on time and spatial distribution characteristics of nutrients losses in surface runoff. The reasons about significant difference of spatial and temporal distribution were different land uses, fertilization and vegetation coverage. The runoff flux of different land uses was the key factor to the transportation fluxes of nutrients.%分别在南通平原河网地区选择典型非圩区开展野外原位试验,用野外观测和室内分析相结合的方法,研究平原非圩区典型试验小区不同土地利用下营养盐在自然降雨—径流驱动下迁移的时空分布特征.结果表明,导致营养盐迁移时空分布存在显著差异的主要原因为不同的土地利用类型、施肥条件及植被覆盖度等,不同土地利用下的径流量差异是导致营养盐迁移通量存在显著差异的主导因素.