华北模拟实验块地大气、降水、地表径流和土壤中的稀土浓度分布及施用农用稀土的影响  

Concentration Distribution of Rare Earths in Rain Water, Surface Runoff, Atmosphere and Soil in Experimental Plots and Influence of RE

作　　者：鲁鹏[1] 王子健[1] 王文华[1] 杨淑兰[1] 彭安[1] 闫欣[2] 张海政[2] 

机构地区：[1]中国科学院生态环境研究中心国家重点环境水化学实验室 [2]中国科学院地质研究所

出　　处：《中国稀土学报》1997年第2期155-159,共5页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金

摘　　要：通过模拟实验块地，初步研究了在一个土壤生态系统中稀土的浓度分布以及施用稀土微肥的影响。结果表明：降水、地表径流水溶液中的稀土浓度均为μｇ／Ｌ量级（０１～１２μｇ／Ｌ），降水中的稀土主要来源于附近地表土壤。大气中的稀土含量随粒径分布有所不同，粒径越小含量越低，且其来源主要是附近的土壤，水可溶性的硝酸稀土微肥在施用后很快转化为水不溶性形态，施加稀土前后实验组表层土壤中稀土含量基本相同。与对照组相比，施加的稀土微肥对地表径流水溶性和悬浮物稀土浓度未产生明显影响。The concentration distribution of RE in environmental medium of an experimental plot and the influence of applying RE fertilizer were discussed. The results show that the concentration of soluble RE in rain water, surface runoff was of the order of μg/L. According to the analysis of atmospheric signature, the origin of RE in the rain water was mainly from local soil. The concentration of RE in atmospheric particulates varied with particles size and lower concentration was observed in the particles of smaller size. According to the ratio of La/RE, the origin of RE in atmosphere should come from local soil. The soluble RE fertilizer become immobilized when applied in the field within 7 days. The concentration of RE in top soil showed no difference before and after applying RE fertilizer. Both concentration analysis and flux calculation show that application of RE fertilizer has hardly influence on RE concentration in surface runoff and soil matrix.

关 键 词：浓度分布 稀土族元素 微量化肥 施肥 土壤生态 

分 类 号：S154.1[农业科学—土壤学]