摘要
多目标区域地球化学调查发现中国南方酸性土壤的硒含量普遍较高,但其生物有效性一般较低,土壤硒有效性直接关系到富硒土地资源的可利用性,而土壤酸碱度是影响土壤硒生物有效性的重要因素。本文选取福建、海南富硒红壤(pH为3.91~4.98)、富硒水稻土(pH为4.33~5.75),以生石灰、燃煤炉渣为改良剂,分别设置6个实验处理以调控土壤硒生物有效性。结果表明:添加生石灰和燃煤炉渣均能提升南方酸性土壤的pH,上升幅度在1~2个pH单位,从而有利于土壤中硒元素的活化,显著提高了土壤中硒元素的生物有效性;燃煤炉渣用量与其10倍的生石灰对提升土壤硒有效度的效果相当,而燃煤炉渣作为调控物料更为经济、实用,既可以实现炉渣的有效利用,又可以改善土壤结构、提高土壤硒有效度。
The multi-purpose regional geochemical survey showed that the concentration of selenium in acid soil in Southern China is generally high,but the bio-availability of selenium in soil is relatively low, which affects the usage of selenium-rich soil. The pH values of soils are an important factor affecting the bio- availability. Se-rich redsoil samples with pH of 3. 91 -4. 98 and Se-rich paddy soil samples with pH of 4. 33 -5. 75 were collected fromFujian Province and Hainan Island. Six experiments were conducted using lime and coal slag as the modifier toimprove the bio-availability of selenium in soil. The results show that soil pH can be significantly elevated by 1 to 2 units by using the modifiers,which advances the mobility of Se in soils and improves selenium bio-availability in soils. Coalcinder and 10 times weights of quicklime have the same effect to promote selenium availability. The coalcinder as a regulation material is more economical and practical. It can not only realize the effective utilization of cinder, but also improve the soil structure and increase the soil selenium availability.
出处
《岩矿测试》
CSCD
北大核心
2017年第3期273-281,共9页
Rock and Mineral Analysis
基金
国土资源部公益性行业科研专项经费项目<典型红壤区农业生态地质研究>课题二"典型地质环境区红壤化过程地球化学特征研究"(201411091-2)
关键词
硒有效度
调控实验
生石灰
燃煤炉渣
南方富硒土壤
Se availability
regulation experiment
quicklime
coalcinder
selenium-rich soil in Southern China