乌蒙山区毕节市耕地土壤微量元素丰缺评价及其影响因素

为了支撑发展山地特色农业的需要，通过1∶5万耕地质量地球化学调查，获取毕节市耕地土壤微量元素的高精度分析数据。选取B、Mo、Cu、Zn、Mn、Go、I及F作为主要研究对象，分析毕节市耕地土壤微量元素的丰缺状况。统计结果表明，毕节市耕地土壤中微量元素含量总体处于较高水平，B、Mo、Cu、Zn、Mn、Co、I及F平均值分别为67.10 mg/kg、2.14 mg/kg、79.20 mg/kg、143.90 mg/kg、1215.00 mg/kg、30.40 mg/kg、5.84 mg/kg和1009.00 mg/kg。评价结果显示，毕节市耕地土壤微量元素丰缺以丰富-过剩为特征，其中B、Cu、Zn、Mn、Co以丰富等级为主，Mo以上限值等级为主，I以高等级为主，F以过剩等级为主，微量养分状况总体较好。毕节市耕地土壤中微量元素丰缺及分布与成土母质、土壤酸碱度、土壤类型及土地利用方式的影响关系密切，其中成土母质为主要影响因素。研究结果为毕节市农业生产中土壤微量元素的合理利用、作物品质提升及发展山地特色农业等提供了地球化学支撑。

Evaluation of trace elements abundance and deficiency in cultivated soil and its influencing factors in Bijie City of Wumeng Mountain

In order to support the needs of the agricultural development of mountain areas, the high precision data of trace elements in cultivated land soil in Bijie City were obtained through 1:50000 geochemical survey of cultivated land quality.B, Mo, Cu, Zn, Mn, Co, I and F were selected as the main research objects to analyze the abundance and deficiency of trace elements in cultivated soil.The statistical results show that the trace elements contents of cultivated soil in Bijie City is generally at a high level, and the mean contents of B、Mo、Cu、Zn、Mn、Co、I and F are 67.10 mg/kg, 2.14 mg/kg, 79.20 mg/kg, 143.90 mg/kg, 1215.00 mg/kg, 30.40 mg/kg, 5.84 mg/kg and 1009.00 mg/kg, respectively.The evaluation results show that the trace elements of cultivated soil in Bijie City are characterized by abundance and excess, of which B, Cu, Zn, Mn and Co are mainly at the enrichment level, Mo above the limit level, I at the high level, and F at the excess level.The overall condition of trace nutrients is good.The abundance, deficiency and distribution of trace elements in cultivated soil in Bijie City are closely related to the parent material, soil pH, soil type and land use mode, among which the parent material is the main influencing factor.This study can provide geochemical support for the agricultural production in Bijie area in the reasonable utilization of soil trace elements, the improvement of crop quality and the development of mountain characteristic agriculture.