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通过压力膜及土柱模拟试验的系统资料分析,论证了土壤水分是制约NO_3~—N运移的主导因子,潮土持水曲线与土NO_3~—N壤持留量曲线均呈幂函数关系.且土壤NO_3~—N持留量与持水量呈极显著正相关,土壤保水性强者,土壤保蓄NO_3~—N能力也强.土壤NO_3~—N淋失量随排水量、施氮量增加而显著增大,土壤NO_3~—N累积淋失量随排水时间的增长而增大.
Through the analysis of system data of pressure membrane and soil column simulation test, it is demonstrated that soil moisture is the dominant factor restricting the migration of NO_3 ~ -N. The curves of water holding capacity of soil moisture and soil NO_3 ~ -N soil showed a power function relationship. There was a significant positive correlation between NO_3 ~ -N holding capacity and water holding capacity, and strong soil water holding capacity and NO_3 ~ -N storage capacity were also higher than those of the control. Soil NO_3 ~ -N leaching capacity increased with the increase of water drainage and nitrogen application rate Increased significantly, and the cumulative leaching amount of NO_3 ~ -N in soil increased with the increase of drainage time.