消除率 meaning in Chinese

elimination factor
elimination rate
elimination ratio

Wells are installed at two well depths per well nest , respectively 1m and 0 . 7m . samples are analyzed for nitrate nitrogen , ammonium nitrogen , total nitrogen , and total phosphor to compare the effect of vegetation type , different field slope and different season . main research results and conclusion of the study are as follows : 1 ) percent total nitrogen is higher in the deep wells 1m than the wells 0 . 7m , by 11 . 43 %
以水样中铵氮、硝氮、总氮、总磷为监测指标，比较了不同深度、不同植被类型、不同季节、不同坡度、不同浓度营养盐冲击下，缓冲带对氮磷等营养盐的消除效果，试验结果如下： 1 )与0 . 7m相比，样点1m深处，缓冲带对总氮的去除效率要高些，二者相差11 . 43 ，而缓冲带对铵氮、总磷、硝氮的去除效果，不同深度，消除率比较接近。