论文部分内容阅读
农田非点源污染已经成为水体污染中最大的问题之一,严重威胁到人们的生产和生活。因此,研究农田,特别是水源地的养分流失特征对于当地的农业生产和管理具有重要意义。本文采用对照试验方法,分析了常规(施肥)处理小区和对照(不施肥)处理小区的氮、磷流失差异,结果表明化肥的施用使得农田养分流失增加。常规小区的总氮和总磷含量及单位面积流失负荷均显著高于对照处理小区,并且无机态养分所占的比例较高。但要从根本上管理农田养分流失问题,则需要从养分流失的形态特征、时间特征和路径特征3个方面加强研究,实现科学有效管理。
Non-point source pollution of farmland has become one of the biggest problems in water pollution, which seriously threatens people’s production and life. Therefore, studying the characteristics of nutrient loss in farmland, especially in water sources, is of great significance to local agricultural production and management. In this paper, the control experiment was used to analyze the difference of nitrogen and phosphorus loss between the conventional (fertilization) and control (no fertilization) plots. The results showed that the application of chemical fertilizers increased the nutrient loss of the farmland. The total nitrogen and total phosphorus contents and the loss per unit area of conventional plot were significantly higher than that of the control plot, and the proportion of inorganic nutrients was higher. However, to fundamentally manage the problem of nutrient loss in farmland, we need to strengthen the research from the three aspects of morphological characteristics, temporal characteristics and path characteristics of nutrient loss so as to achieve scientific and effective management.