摘要
通过检测陕西省韩城市不同深度(表层0~20 cm、中层20~60 cm、深层60~100 cm)土壤样品碘元素含量,分析了不同土壤类型、不同地形坡度、不同土地利用类型土壤的碘含量水平,对研究区土壤碘空间分布与影响因素进行了研究。结果表明:(1)韩城市表层土壤碘含量相对于中层、深层土壤更加富集;表层、中层、深层土壤碘平均含量均处于适宜水平,土壤碘含量远低于全国土壤碘背景值,整体属于低碘地区,没有高碘区域。(2)不同土壤类型间,土壤碘含量差异不大。(3)不同地形坡度下,土壤碘含量随着地形坡度增大而降低,特别地,地形坡度超过6°~15°时,碘含量下降率陡增。(4)不同土地利用类型下,表、中、深层土壤碘含量最高均为水浇地,表层最低的是旱地,中、深层最低的是草地。值得注意的是,草地表层土壤碘含量是中层的2.8倍,是深层的8.5倍,呈现断崖式下降。(5)韩城市表层土壤碘含量整体属于适量–边缘范围;中、深层土壤在低–中山区与河流阶地区普遍属于碘缺乏,而在南部黄土台塬区与北部低山丘陵区整体上属于边缘范围。
By measuring soil iodine content at different depths(surface soil,0–20 cm;middle soil,20–60 cm;deep soil,60–100cm)in Hancheng City,Shaanxi Province,soil iodine content levels of different soil types,different terrain slopes and different land use types were analyzed and compared,and the spatial distribution and influencing factors of soil iodine content were studied.The results showed that:1)Iodine was more enriched in surface soil than in middle and deep soils.Average iodine contents in surface,middle and deep soils were all at the appropriate level,and soil iodine content was much lower than the national soil iodine background value,thus,Hancheng City belonged to the low soil iodine area withoutang high iodine area.2)No significant difference was found in soil iodine contents among different soil types.3)Under different topographic slopes,soil iodine content decreased with the increase of topographic slope,particularly,when the topographic slope exceeded 6°–15°,the decrease rate of iodine content increased sharply.4)Among different land use types,irrigated land had the highest iodine content in surface,middle and deep soils,dry land had the lowest iodine content in surface soil,and grassland got the lowest iodine content in middle and deep soils.It is worth noting that the iodine content of the surface soil in the grassland was 2.8times of the middle soil and 8.5 times of the deep soil,showing a cliff-like decline.5)Iodine content in the surface soil of Hancheng City belonged to the moderate-marginal range.In the middle and deep soil,the low-middle mountain area and river terrace were generally iodine deficient,while the southern loess tableland and the northern low hill area belonged to the marginal range.
作者
喜俊生
李新斌
康成鑫
赵子豪
张姚
刘林
王博
张猛
XI Junsheng;LI Xinbin;KANG Chengxin;ZHAO Zihao;ZHANG Yao;LIU Lin;WANG Bo;ZHANG Meng(Xi'an Mineral Resources Survey Center,China Geological Survey,Xi'an 710100,China;School of Human Settlements and Architectural Engineering,Xi'an Jiaotong University,Xi'an 710054,China;Field Observation and Research Station of Soil and Water Elements Coupling and Biological Resources Conservation in Qinling-Loess Plateau Transition Zone,Tongguan,Shaanxi 714300,China)
出处
《土壤》
北大核心
2025年第5期1178-1184,共7页
Soils
基金
中国地质调查局项目(DD20242461,DD20242563,DD20230800209)资助。
关键词
韩城市
土壤碘
空间分布
影响因素
Hancheng City
Soil iodine
Spatial distribution
Influencing factor
