Nitrogen and phosphorus losses from agricultural systems in China: A meta-analysis

Cao, Di; Cao, Wenzhi; Fang, Jing; Cai, Longyan

Nitrogen and phosphorus losses from agricultural systems in China: A meta-analysis

2014

Cao, Di | Cao, Wenzhi | Fang, Jing | Cai, Longyan

Studies worldwide have indicated that agricultural pollution is the main source of nitrogen and phosphorus (N and P) in surface waters. A systematic understanding of N and P sources and sinks in agricultural systems is important for selecting the appropriate remedial strategies to control nutrient losses and water pollution. Based on nationwide data and a long-term monitoring program in Southeast China, the nationwide spatial and temporal patterns of N and P losses and the relationships between such losses and N and P inputs and rainfall were analyzed. The results showed that the annual nutrient losses from agricultural systems in China strongly varied, and the N/P values ranged from 0.01 to 51.0, with a majority at approximately 0–20, and an arithmetic mean of 9.73; these values mostly overlap the suitable range of N/P (6–15) for red bloom algae.

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