新疆若羌县农用地表层土壤硒氟碘地球化学特征
马常莲, 周金龙, 曾妍妍, 任贵兵, 王松涛

Geochemical characteristics of selenium, fluorine, iodine in surface soil of the agricultural land in Ruoqiang County, Xinjiang
MA Chang-Lian, ZHOU Jin-Long, ZENG Yan-Yan, REN Gui-Bing, WANG Song-Tao
表7 研究区表层土壤Se、F、I分级标准及其划分结果
Table 7 Classification criteria and statistics of Se,F and I contents of surface soils
元素 分级 缺乏 边缘 适量 过剩
Se 含量范围/10-6 ≤0.125 0.125~0.175 0.175~0.4 0.4~3.0 ≥3.0
样品数 29 22 80 11 0
比例/% 20.4 15.5 56.3 7.8 0.0
F 含量范围/10-6 ≤400 <400~500 >500~550 >550~700 ≥700
样品数 2 17 14 58 51
比例/% 1.4 12.0 9.9 40.8 35.9
I 含量范围/10-6 ≤1 <1~1.50 >1.50~5 >5~100 ≥100
样品数 70 65 11 0 0
比例/% 49.3 43.0 7.7 0.0 0.0