The other part of their paper was to evaluate the risk of heavy metal ( cadmium ) movement in the field . first , the experiment of cadmium sorption was carried out in a 15mx 15m plot at yongledian , tongxian county , in beijing and 36 different soil samples were taken from the field plot according to the 3mx3m grid size 首先,在永樂店試驗(yàn)站15m 15m的試驗(yàn)小區(qū)上,以3m 3m為網(wǎng)格間距取36個(gè)點(diǎn)的土樣,獲得每個(gè)土樣的土壤質(zhì)地,對(duì)這36個(gè)土樣在實(shí)驗(yàn)室內(nèi)開展鎘的吸附實(shí)驗(yàn),研究其吸附特性,獲得吸附參數(shù)。