川西北草原土壤微量元素的供给能力

根据 110余个表层土壤样品微量元素含量的测定结果和通用的土壤微量元素缺乏临界值指标,探讨了川西北草原土壤微量元素的供给能力以及与之有关的含量水平、有效性及其影响因素。统计计算结果表明:川西北草原土壤有效硼和锰含量很低,硼、锰缺乏较为严重和普遍;有效锌含量不高,约有1/4的土壤供锌不足;有效铜和铁含量丰富,基本上不缺。

SUPPLYING ABILITY ON THE TRACE ELEMENTS IN SOILS FROM NORTHWESTERN SICHUAN GRASSLAND

In this paper, the content, availability and deficient status of trace elements in soils from grassland in northwestern Sichuan Province are studied. The supplying ability of trace elements in soils is classified 5 types.namely .very low .low ,moderate,high and very high .according to their available trace element contents and the critical deficiency values.The analyzed results of soil samples of more then 110 sites show : the total content of trace elements in soils of this region are richer. The range and mean value of the total contents of B, Zn,Mn,Cu,and Fe are 72-300ppm with an average of 166ppm,37. 5-142ppm with an average of 75. 4ppm, 115-1542. 8ppm with 736. 3ppm, 7. 5-66. 3ppm with an average of 21. 5ppm,12013-93713ppm with an average of 33917ppm respectively.lt is obvious that the total contents of B,Mn are higher than those in the soils of other region in China,however,the total content of Zn is lower than that in soils of other region in China,the total contents of Cu and Fe are approximate with those in soils of other region in China.The content of available trace elements in soils of grassland in northwestern Sichuan Province varied greatly. The range and mean value of available B, Zn, Mn, Cu, and Fe are 0.006-1.325ppm with an average of 0. 453ppm, 0. 398-4. 480ppm with an average of 1. 692ppm,0. 482-55. 0ppm with an average of 5. 106ppm,0.146-5. 374ppm with an ave-rage of 0. 842ppm and 0. 70-492. 2ppm with an vaerage of 75. 7ppm respectively. The statistical results show that the most soils are deficient in B and Mn,Zn and Fe deficiencies are found in the approximate quarter of soils investigated,Cu deficiency is only related to a few soils.