云南省主要家畜饲养基地土壤碘含量、分布及其影响因素

Studies on the contents,distribution and influence factor of iodine in soil from mainly livestock feeding base of Yunnan province

通过对云南省主要家畜饲养基地所在巍山、洱源、丽江、永胜、元江、通海、陆良、宜良和昭通9个县(市)的147个土壤碘的分析,深入研究了饲养基地土壤碘含量、分布及其影响因素。结果表明:云南省主要家畜饲养基地大部分土壤含碘正常,属中等含碘水平,但是有40.69%的样品碘含量低于全国土壤碘平均水平,有部分地区家畜面临碘缺乏危险;母质对土壤碘含量影响较大,由灰岩、白云岩发育的红壤土壤碘含量最高,平均值为10.25 mg/kg,其次是玄武岩发育的2个背景区土壤,平均值分别为6.73和6.51 mg/kg,而由砂岩、页岩、泥岩、砾岩和片麻岩等为主要母岩的土壤碘平均含量最低;土壤碘含量与土壤pH呈极显著的负相关(r=-0.367,P<0.01),而与土壤阳离子交换量(CEC)呈显著的正相关(r=0.431,P<0.05),和有机质呈不显著的正相关。

This article studied the contents,distribution and influence factors of iodine in soil by analyzing the 147 soil samples from mainly livestock feeding base including Weishan, Eryuan, Lijiang, Yongsheng, Yuanjiang, Tonghai, Luliang,Yiliang and Zhaotong county. The results showed that the mean of content of iodine in soil was dropped into the normal, but 40.69% samples were lower than the average value of China. As a result,livestock in some areas will suffer the risk of iodine lack. The soil parent material affected the content and distribution of iodine. The contents of iodine in soil from limestone and dolomite were highest than others,the mean was 10. 25 mg/kg. The contents of iodine in soil of 2 areas from basalt were 6.73 and 6.51 mg/kg,respectively. However,the contents of iodine in soil from sandstone,shale,mushstone,conglomerate and gneiss were lowest than others. There were significant negative correction for contents of iodine in soil with soil pH, and significantly positive correction with soil CEC, and positive correction with soil OM.