RT Journal Article
SR Electronic
T1 Relationships of nitrogen losses, phosphorus losses, and sediment under simulated rainfall conditions
JF Journal of Soil and Water Conservation
FD Soil and Water Conservation Society
SP 231
OP 241
DO 10.2489/jswc.75.2.231
VO 75
IS 2
A1 Z. Yuan
A1 Y. Liao
A1 M. Zheng
A1 M. Zhuo
A1 B. Huang
A1 X. Nie
A1 X. Wu
A1 D. Li
YR 2020
UL http://www.jswconline.org/content/75/2/231.abstract
AB Losses of nitrogen (N) and phosphorus (P) often occur during the process of soil erosion and are often the primary sources of water eutrophication. Using artificial rainfall experiments, this study analyzed the characteristics of N and P losses and relationships of N losses, P losses, runoff volume, and sediment yield. The results indicated that N, P, and sediment loss rates had significant variations in the beginning and became stable in the middle and late stages of runoff for single rain events. The ammonium nitrogen (NH4+-N), nitrate nitrogen (NO3−-N), and dissolved phosphorus (DP) were transported primarily through runoff water, which accounted for approximately 92.6%, 98.1%, and 89.4% of their respective totals. However, the losses of total nitrogen (TN) and total phosphorus (TP) in runoff water only accounted for 50.4% and 9.7% of their respective totals. The loss rates of N, P, and sediment had significant relationships with runoff rate or rainfall, and N and P loss rates had significant relationships with sediment loss rate as well. Ammonium nitrogen, TN, and TP enriched sediment at different degrees for single rain events, and the enrichment with TP was the most significant, especially under the rainfall intensities of 120 mm h−1 and 180 mm h−1.