Abstract：A case study of drains in Zhangsong Village watershed and in No.15 Chung of Wanqingsha was carried out. The spatial-temporal dynamics of nitrogen and phosphorous concentrations in farmland ditch systems were investigated. Results showed that the average concentrations of nitrogen and phosphorous in farmland drainage water were higher than those in the nearby streams and the Pearl River. Along with the downstream of drains, TN and NH4+-N concentrations decreased, however, NO3--N concentrations increased gradually. TP concentrations in No.15 Chung of Wanqingsha decreased alone with the downstream of drains, but no significant change occurred in drains of Zhangsong village. Spearman correlation analysis showed that the relationships between TN and NH4+-N、TP、CODcr were positively correlated respectively in zhangsong village drains, but NH4+-N and NO3--N was negatively correlated. The relationships between TN and NH4+-N, NO3--N, TP and CODcr were significantly positively correlated in No.15 Chung of Wanqingsha drain. The results could be useful for pollution control of non-point sources in Pearl River estuary.
梁秋洪, 李取生, 罗璇, 张乾坤, 陆君. 珠江河口地区农田水体N、P污染研究[J]. 中国环境科学, 2012, 32(4): 695-702.
LIANG Qiu-Hong, LI Qu-Sheng, LUO Xuan, ZHANG Qian-Kun, LU Jun. Study on nitrogen and phosphorus in farmland water bodies of the Pearl River estuary. CHINA ENVIRONMENTAL SCIENCECE, 2012, 32(4): 695-702.
