摘要
采用水稻盆栽实验,对施用组配改良剂(石灰石+海泡石)前后盆栽土壤的酸碱性、有机质含量和营养元素有效态含量,盆栽水稻糙米Pb、Cd含量进行分析和评价。结果显示:施用组配改良剂能够降低水稻糙米Pb、Cd含量,显著提高土壤pH值(从5.57到7.34)和土壤CEC(添加量达到16 g·kg-1时,比对照提高217%);但是施用组配改良剂对土壤有机质含量影响未达显著水平,其变化率在-2%到7%之间。另一方面,施用组配改良剂对土壤中营养元素(Ca、Mg)有效态含量有提高作用,最多比对照分别提高293%和22%;组配改良剂添加量与土壤中碱解N、有效P、速效K含量无显著相关性;施用组配改良剂会降低微量营养元素Fe有效态的含量,但添加量与有效态含量并无显著相关性。因此,本研究表明,施用这种组配改良剂到重金属污染土壤,能够有效改善土壤环境,提高保肥能力,降低糙米Pb和Cd的含量。
Chemical fixation is one of remediation techniques for heavy metal contaminated soils. This study was designed to examine and evaluate the effects of combined amendments （calcium carbonate ＋ sepiolite） on soil pH, organic matter content, available micronutrients in soil, and contents of Pb and Cd in brown rice. Compared to the control, application of combined amendments decreased contents of Pb and Cd in brown rice, and elevated soil pH（from 5.57 to 7.34） and CEC by 217% at 16 g.kg-1 of combined amendments）. No significant changes were observed in soil organic matter（range from -2% to 7%）. Soil exchangeable Ca and Mg were enhanced by 293% and 22%, respectively, after application of combined amendments. Soil available N, P and K did not show significant correlationship with amounts of combined amendments. Soil available Fe reduced in the amendment treatments, but had no relation with application rates. These results indicate that application of combined amendments（calcium carbonate ＋ sepiolite） could increase soil pH, improve soil nutrient holding capacity, and decrease heavy metals in brown rice.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2014年第5期907-912,共6页
Journal of Agro-Environment Science
基金
国家环保部公益性项目(201009047)
湖南省重点学科建设项目(2006180)
关键词
组配改良剂
土壤
有效养分
重金属
土壤理化性质
combined amendments
soil
available nutrient
heavy metal
soil physicochemical properties
