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【摘 要】
：
Ammonia nitrogen (NH4+-N) is one of the three main forms of total nitrogen (TN). Most studies have estimated the load of TN fromnonpoint sources instead of one
【机 构】
：
Institute of Geographic Sciences and Natural Resources Research,Department of Geography,Nanjing Inst
【出 处】
：
环境科学学报（英文版）
【发表日期】
：
2004年期
【基金项目】
：
国家自然科学基金;国家重点基础研究发展计划(973计划)
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