贵州省耕土中可溶态稀土的分布特征及其影响因素  

Distribution of the Soluble Rare Earth Elements and Their Influence Factors on Their Contents in the Farmland of Guizhou Province

作　　者：曾明果 李一平 张德清 

机构地区：[1]贵州省地质矿产局地质科学研究所

出　　处：《贵州地质》1994年第2期98-111,共14页Guizhou Geology

基　　金：贵州省重点技术开发项目

摘　　要：研究成果表明，贵州省耕土中可溶态稀土含量分布变化大致可划分为五个区：①毕节－大方－织金－六枝以西高值区；②平坝－贵阳－开阳中值区；③册享－惠水－从江（以南）低值区；④毕节－遵义－道真（以北）低值区，⑤龙里－余庆－铜仁低值区。其区域背景总概貌为：西高东低，从中部向北向南递减．各土壤类型的∑ＳＲＥ２Ｏ３含量趋势为：黄棕壤＞紫色土＞石灰土＞红壤＞水稻土（黑壤或黄壤）．耕土中稀土元素归－化模式曲线反映出Ｅｕ和Ｌｕ亏损时，∑ＲＥ２Ｏ３为低值．归一化曲线较平直时为高值。轻稀土和重稀土的比值∑ＬＲＥＥ／∑ＲＥＥ（％）＞９０时，∑ＳＲＥ２Ｏ３为低值，反之为较高值。多数耕土中粘土矿物，尤其是高岭石含量较高时∑ＳＲＥ２Ｏ３相应较高，反之较低。用微机进行多元统计分析表明：∑ＳＲＥ２Ｏ３和∑ＲＥ２Ｏ３呈显著正相关．∑ＳＲＥ２Ｏ３与土壤颜色及母岩地层时代的相关系数分别为＋０．１６４和＋０．１３５，也呈显著正相关关系。即二叠系三叠系地层分布区的黄棕壤和紫色土的∑ＳＲＥ２Ｏ３大多显著高于黄壤和水稻土（黑壤）。最后分析了影响我省耕土可溶态稀土含量高低变化的各种因素，并建议推广稀土微肥应优先放在三个∑ＳＲＥ２Ｏ３低值区进行，同时以黄壤、红壤?On the basis of the chemical analyses of the soluble REE in the farmlands of Guizhou: the land can be generally divided into five districts with variation in REE content: the district with high REE value in the west of Bine-Dafang-Zhijin-Liuzhi line; the Pingba-Guiyang- Kaiyang district with intermediate RE E value;and three districts with low REE value, the south of Ceheng-Huishu-Congjiang line, thernorth of Bijie Zunyi-Daozhen line and Longli- Yuqiug-Tongren, As a whole, the regioal background shows a tendency to decrease eastwards and from the center of Guizhou to the south amd north. The various types of soils are arranged in order of the ∑SRE2O3 content in them as: yellow-brown soil, purple soil, limesoil, red soil,rice-soil (black or yellow). The ∑RE2O3 content of the land is low when the Eu and Lu contents shown on the curves of chondrite-normalized REE pattern are deficient, and is high when being nat on the curves. Whereas ∑SRE2O3 is high when the ZLREE/ZREE (K) ratios are lower than 901 coversely,￣E:O, is low.The content of acRE,O, increases with the abundance of clay minerals; espeially kaolinite.The results of multivariant analysis calculated on the computer reveal that the correlation between ∑SRE2O3 and ∑RE2O3 is remarkably positive. The correlation coefficients of ∑SRE2O3 with the soil colors and the chrons of the underlying parent rocks are respectively +0. 164 and +0. 135, that is, most of the yellow-brown soils and the purple soils covered on Persian to Triassic rocks are outstandingly higher in ∑SRE2O3 than those yellow soils and rice-soils (black). Thus,it is suggested that the yellow soils,red soils, lime soils, and rice-soils should be preferentially fertilized with REE. In addition, the influences on the contents of the soluble REE in the land have been also investigated.

关 键 词：耕土 可溶态稀土 分布特征 

分 类 号：S153.61[农业科学—土壤学]