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Seasonal variation patterns of NH4+-N/NO3--N ratio and δ15NH4+ value in rainwater in Yangtze River Delta.
XIE Ying-xin1,2;ZHANG Shu-li1;ZHAO Xu2;XIONG Zheng-qin2;XING Guang-xi2
Chinese Journal of Applied Ecology . 2008, (09): 2035 -2041 .