我国土壤有效镁含量及分布状况与含镁肥料的应用前景研究

Study on the content and distribution of soil available magnesium and foreground of magnesium fertilizer in China

本文采用土壤养分系统研究法,分析了我国31个省(市、自治区)的17790个土壤样品中有效镁的含量,结果表明:我国土壤有效镁含量从1 2mg/L到4468 9mg/L不等,平均含量为320 6mg/L。地区间变异性较大。根据土壤系统研究法的养分评价指标,我国土壤有效镁含量处于严重缺乏状态的土壤占8%,处于缺乏状态的土壤占13%,处于中等水平的占33%,而处于丰富和极丰富状态的分别占34%和12%。有54%的土壤需要不同程度的补充镁素肥料;我国土壤有效镁含量较低的区域主要集中在长江以南地区,主要省份有福建、江西、广东、广西、贵州、湖南和湖北等省份。根据我国土壤有效镁含量判断,每年我国土壤需要补充984万吨的含镁肥料。

The content and the distribution of soil available magnesium of 31 provinces in China were studied by soil systematic approach with 17790 selected soil samples. The results indicated that the content of soil available Mg was from 1.2 mg/L to 4468.9 mg/L, the average content was 320.6 mg/L. According to the evaluate index of soil systematic approach, about 8% of the selected soil was seriously Mg deficient, 13% was potentially deficient, 33% was in the middle level, 34% was sufficient and 12% was excessive. There were about 54% of soils that should supply magnesium fertilizer and the soils with low available Mg was mostly distributed in south Changjiang-river, such as Fujian, Jiangxi, Guangdong, Guangxi, Guizhou, Hunan, Hubei. It estimated that the annual need of magnesium fertilizer would be about 9840 KT in China.