三峡库区紫色土坡地典型暴雨径流氮磷流失特征

doi:10.19741/j.issn.1673-4831.2021.0077

Abstract

Abstract: To study the movement of nitrogen (N) and phosphorus (P) on a purple soil slope during rainstorm runoff, the rainfall runoff process of Lanlingxi watershed in Three Gorges Reservoir Area was monitored in 2019 using a slope plot. Two rainstorms, typical of long-term uniform rainfall (June 22) and short-term heavy rainfall (August 3), were selected to analyze the impact of rainstorm characteristics on surface flow, interflow and N and P loss with runoff. The results show that:(1) there were significant differences in runoff, runoff duration, peak flow and runoff rate between the two rainstorm events. The time of peak rainfall intensity had a decisive effect on the interflow generation time. (2) Under different rainstorm conditions, the concentration of N and P in surface flow and interflow were significantly different. This was mainly affected by rainfall and peak rainfall intensity. The concentrations of N and P in runoff were negatively correlated with rainfall in the same period, and positively correlated with runoff in the same period. (3) Total N (TN) was the main form of soil nutrient runoff loss, and there was a significant positive correlation between N and P loss and runoff loss. On June 22 and August 3, TN loss was 4.03 and 8.49 kg·hm^-2, respectively, in which the contribution rate of interflow was 88.59% and 85.51%, respectively. The total P (TP) loss was 0.11 and 0.33 kg·hm^-2, respectively, of which the loss in granular form accounted for 54.55% and 60.61%, respectively. The results show that short-duration heavy rainfall caused greater soil erosion and nutrient loss. This provides a reference for the prevention and control of agricultural non-point source pollution in the Three Gorges Reservoir Area.

Key words: Three Gorges Reservoir Area, purple soil, rainstorm type, surface flow, interflow, nitrogen, phosphorus

CLC Number:

X52
S157.1

WANG Tian, XIAO Wen-fa, HUANG Zhi-lin, ZENG Li-xiong. Characteristics of Typical Rainstorm-runoff Nitrogen and Phosphorus Loss on Purple Soil Slope in Three Gorges Reservoir Area[J]. Journal of Ecology and Rural Environment, 2022, 38(3): 367-374.

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Characteristics of Typical Rainstorm-runoff Nitrogen and Phosphorus Loss on Purple Soil Slope in Three Gorges Reservoir Area

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