干旱区生态环境知识资源中心(Arid): 西北干旱区农田土壤磁性特征及其环境意义

Arid

	西北干旱区农田土壤磁性特征及其环境意义
其他题名	Magnetic Properties of Farmland Soils in Arid Regions in Northwest China and Their Environmental Implications
	王新 1; 夏敦胜 1; 王博 2; 陈红 1; 刘浩 1
来源期刊	环境科学
ISSN	0250-3301
出版年	2017
卷号	38 期号:8 页码:3507-3518
中文摘要	为探究环境磁学方法在西北干旱区农田土壤污染监测中的可行性,以典型绿洲农业区张掖市(临泽县、甘州区、民乐县和山丹县)为研究区域,采集农田土壤样品102份并对其进行系统的环境磁学分析. 结果表明,张掖市农田土壤磁性特征以亚铁磁性的磁铁矿为主导,磁晶颗粒主要为粗粒假单畴(PSD)和多畴(MD),颗粒等效粒径介于0.2~1 mum之间; 样品磁化率(chi_(lf))变化范围为22.2710~(-8)~188.3610~(-8) m~3·kg~(-1),平均值为63.85*10~(-8) m~3·kg~(-1),磁性矿物含量总体较少但空间变化较大; 磁参数空间分布表明,磁性矿物含量在甘州区、民乐县和山丹县高于临泽县,并在甘州区的中部、民乐县的西南边和山丹县的西边呈现相对高值; 甘州区中部的磁性高值主要受控于工业生产等人类活动,民乐县西南边和山丹县西边的磁性高值主要与较强的自然成土作用有关. 综合多种磁学参数的系统分析能够有效区分和划定农田土壤人为污染范围,为农田土壤污染防治工作提供依据.
英文摘要	In order to understand the feasibility of environmental magnetism methods in farmland soil pollution monitoring in the northwest arid areas of China, the environmental magnetic properties of 102 farmland soil samples from four typical agricultural regions, namely Linze county, Ganzhou district, Minle county, and Shandan county in Zhangye City were systematically analyzed. The results show that the main magnetic mineral of farmland soil samples is ferrimagnetic magnetite, and the main magnetic grain sizes are coarse-grained pseudo single domain (PSD) and multidomain (MD), mainly between 0.2-1 mum in equivalent diameter. The low frequency magnetic susceptibility (chi_(lf)) value of farmland soil samples ranged from 22.2710~(-8) m~3·kg~(-1) to 188.3610~(-8) m~3·kg~(-1), with the average value of 63.85*10~(-8) m~3·kg~(-1). Overall, the magnetic mineral content of farmland soil samples was low, but it had large spatial variation. The spatial distribution of the magnetic parameters show that the magnetic mineral contents in Ganzhou district, Minle county, and Shandan county are higher than in Linze county, and three relatively high-value areas are present in central Ganzhou district, the southwest side of Minle county, and the west side of Shandan county. High magnetic value in central Ganzhou district is mainly controlled by human activities, such as industrial production, whereas the high magnetic values in the southwest side of Minle county and west side of Shandan county are more related to strong natural pedogenesis. Therefore, systematic comprehensive analysis of magnetic parameters can effectively distinguish and delimit the man-made pollution range in farmland soil and provide a basis for farmland soil pollution prevention and control.
中文关键词	农田土壤 ; 环境磁学 ; 污染监测 ; 磁性特征 ; 张掖市
英文关键词	farmland soil environmental magnetism pollution monitoring magnetic properties Zhangye City
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ENVIRONMENTAL SCIENCES
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:6042095
来源机构	中国科学院西北生态环境资源研究院 ; 兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236187
作者单位	1.兰州大学资源环境学院, 西部环境教育部重点实验室, 兰州, 甘肃 730000, 中国; 2.中国科学院西北生态环境资源研究院, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	王新,夏敦胜,王博,等. 西北干旱区农田土壤磁性特征及其环境意义[J]. 中国科学院西北生态环境资源研究院, 兰州大学,2017,38(8):3507-3518.
APA	王新,夏敦胜,王博,陈红,&刘浩.(2017).西北干旱区农田土壤磁性特征及其环境意义.环境科学,38(8),3507-3518.
MLA	王新,et al."西北干旱区农田土壤磁性特征及其环境意义".环境科学 38.8(2017):3507-3518.