Changes of phosphate and ammonium nitrogen in irrigated waters of Hani terrace wetlands along the elevation gradients

Huifeng Xu, Qinggai Wang, Junhong Bai, Rong Xiao, Haifeng Gao, Baoshan Cui
2010 Procedia Environmental Sciences  
PO 3 --P and NH 4 + -N concentrations were measured in the overlaying waters at different elevations in Hani terrace wetlands on the Yunnan plateau of China in December, 2004, in order to study spatial variations in nitrogen and phosphorous concentrations along the elevation gradients under domestic sewage injection in fallow period. Results showed that there were consistent variations in PO 3 --P and NH 4 + -N concentrations in both terraces with elevation. They were reduced exponentially with
more » ... exponentially with decreasing elevations in both terraces and appeared the maximum at the higher elevations where domestic sewage was injected. The goodness-of-fits of the fitting models were more than 0.90 and 0.85 in MP and QFZ terraces, respectively. The retention rates of NH 4 + -N and PO 3 --P from domestic sewage in both terraces in fallow period was 98.7% and 90%, respectively.
doi:10.1016/j.proenv.2010.10.148 fatcat:uktomz3bfvacniakganpozm2b4