不同灌排处理下氮磷迁移转化的研究

field contrast experiments was conducted in southern rice area because irrigation and drainage areas increase constantly, water efficiency is not high, fertilizer losses are so severe that downstream rivers and lakes are contaminated. Based on this experiment, this paper investigates the displacement, N and P losses, and the moving and transforming law of N and P under different treatment of irrigation and drainage, which considers the synergistic effects of water-saving irrigation and controlled drainage as well as uses control variate method. The results show that under shallow-irrigation and deep-sluice model (G1), the water discharge of controlled drainage (L1) decreases 7.59% compared with uncontrolled drainage (L2). While under the shallow-wet irrigation(G2), the displacement of L1 decreases 8.44% compared with L2. At the mean time, the losses of NO3--N、NH4+-N、TN、TP on L1 decrease separately 34.08%、7.11%、11.31%、56.4% compared with L2. Therefore, controlled drainage is helpful to reduce the displacement and N and P losses. The irrigation and drainage combination of G1L1 is more conducive to control water displacement, reduce the losses of nitrogen and phosphorus.