东北典型黑土富硒区土壤与作物硒含量特征及影响因素——以海伦市为例  

Characteristics and Influencing Factors of Se Content of Soil and Crop in Se-rich Areas of Isohumosols(Mollisols)in Northeast China:A Case Study of Hailun

作　　者：马婧萱 崔晓丹[1,3,4] 梁强 胡文友[1,2] 黄标 MA Jingxuan;CUI Xiaodan;LIANG Qiang;HU Wenyou;HUANG Biao(Key Laboratory of Soil and Sustainable Agriculture,Chinese Academy of Sciences,Nanjing 211135,China;Sino-Danish College,University of Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;Technology Innovation Center for Ecological Monitoring&Restoration Project on Land(Arable),Ministry of Natural Resources,Geological Survey of Jiangsu Province,Nanjing 210018,China)

机构地区：[1]土壤与农业可持续发展重点实验室(中国科学院),南京211135 [2]中国科学院大学中丹学院,北京100190 [3]中国科学院大学,北京100049 [4]自然资源部国土(耕地)生态监测与修复工程技术创新中心,江苏省地质调查研究院,南京210018

出　　处：《土壤》2024年第5期1101-1110,共10页Soils

基　　金：国家重点研发计划项目(2021YFD1500202);江苏省科技计划“一带一路”创新合作项目(BZ2023003);自然资源部国土(耕地)生态监测与修复工程技术创新中心开放课题项目(GTST2021-013)资助。

摘　　要：为探究东北典型黑土富硒区土壤–作物系统硒含量及影响因素,选择海伦市为研究区,调查分析了表层土壤的理化性质、全硒和有效硒含量,大宗农产品(水稻、大豆、玉米)可食用部分硒含量。结果表明,研究区土壤全硒含量水平相对较高,均值为0.303 mg/kg,有效硒含量均值为0.018 mg/kg,硒活化率(有效硒的占比)偏低;土壤全硒和有效硒含量都具有明显的空间分布特征,高值区主要分布在研究区的西北部和中部(永和乡、爱民乡、向荣乡和长发乡);3种大宗农作物硒含量由高到低为水稻(0.028 mg/kg)>大豆(0.014 mg/kg)>玉米(0.007 mg/kg);相关性分析表明,土壤硒含量的主要影响因素为土壤有机质、全氮、阳离子交换量和粉粒含量,高有机质含量抑制了水稻和玉米对土壤硒的吸收。本研究为研究区开发利用富硒土壤提供了从区域选择到作物类型选择的数据支撑。In order to investigate the selenium(Se)content of soil-crop system and its influencing factors in a typical Se-enriched Isohumsols area of northeast China,Hailun City was taken as the study area,the physicochemical properties,total Se and available Se contents in surface soils(0–20 cm),and Se contents in edible portions of crops(rice,soybean and maize)were analyzed.Results showed that soil total Se content was relatively high,with an average value of 0.303 mg/kg,yet Se activation rate(proportion of available Se to total Se)was low with an average value of 0.018 mg/kg for available Se.Both total and available Se contents in soil had obvious spatial distribution characteristics,and the high value areas were mainly distributed in the northwestern and central regions(Yonghe,Aimin,Xiangrong and Changfa towns).For the 3 main crops,Se content from high to low was rice(0.028 mg/kg)>soybean(0.014 mg/kg)>maize(0.007 mg/kg).Correlation analysis showed that the main influencing factors of soil Se content were soil organic matter,total nitrogen,CEC and clay contents,and high organic matter content inhibited soil Se uptake by rice and maize.This study provides data support from planting area to crop type selection for the development and utilization of Se-enriched soil in the study area.

关 键 词：海伦市 黑土 硒 土壤–作物系统 硒生物利用率 

分 类 号：X825[环境科学与工程—环境工程]