海伦市耕地表层黑土中有机碳与不同矿物态铁的空间分布特征及其相关关系  

Spatial Distribution and Correlation Relationship of Organic Carbon and Mineral Iron in Surface Black Soil of Cultivated Land in Hailun City

作　　者：谭琴 童蕾[1] 马乃进 李玉琼 陈伟涛[2] 孙松 戴慧敏[3] 初禹 杨汉水 TAN Qin;TONG Lei;MA Naijin;LI Yuqiong;CHEN Weitao;SUN Song;DAI Huimin;CHU Yu;YANG Hanshui(School of Environmental Studies,China University of Geosciences(Wuhan),Wuhan 430074,China;School of Computer Science,China University of Geosciences(Wuhan),Wuhan 430074,China;Shenyang Geological Survey Center,China Geological Survey,Shenyang110034,China;Heilongjiang General Institute of Ecological Geological Survey and Research,Haerbin150030,China)

机构地区：[1]中国地质大学(武汉)环境学院,湖北武汉430074 [2]中国地质大学(武汉)计算机学院,湖北武汉430074 [3]中国地质调查局沈阳地质调查中心,辽宁沈阳110034 [4]黑龙江省生态地质调查研究总院,黑龙江哈尔滨150030

出　　处：《安全与环境工程》2020年第6期23-30,共8页Safety and Environmental Engineering

基　　金：国家自然科学基金面上项目(41772364)。

摘　　要：海伦市位于松嫩平原典型黑土区,经过近200年开垦,区域内黑土中有机碳(TOC)含量不断下降并呈现显著差异。土壤中TOC与铁矿物的结合状态是黑土中TOC储存与转化的重要因素之一。通过系统采集海伦市耕地表层黑土样本,研究了海伦市耕地表层黑土中TOC与不同矿物态铁的空间分布特征及其相关关系,并结合土壤pH值和含水率分析不同铁矿物对黑土中TOC含量的影响程度。结果表明:海伦市耕地表层黑土48个样点TOC含量的变化范围为15.35~48.45g/kg,平均值为27.70g/kg,变异系数为0.2647,其空间分布特征差异性显著,黑土中TOC含量在空间上表现为从东北向西南递减;耕地表层黑土中铁矿物主要以水铁矿+纤铁矿为主,其铁含量范围在3.29~10.52g/kg之间,其次为针铁矿+赤铁矿,两者铁含量的空间分布规律与土壤中TOC含量一致,且与TOC含量均表现为显著正相关关系(r值分别为0.607和0.797),而黑土中菱铁矿、磁铁矿、黏土矿、黄铁矿中铁含量整体较少;耕地表层黑土中不同铁矿物对土壤中TOC的影响程度表现为针铁矿+赤铁矿>水铁矿+纤铁矿>黏土矿>黄铁矿。Hailun City is located in the typical black soil area of Songnen Plain.The organic carbon(TOC)content of black soil decreased and showed significant differences in this area after nearly 200years of reclamation.The combination of organic carbon and iron mineral in soil is one of the important factors controlling the storage and conversion of organic carbon in black soil.By collecting the surface black soil samples,this paper studies the spatial distribution and correlation relationship between TOC and different mineral iron in surface black soil of Hailun City,and analyzes the influence of different iron minerals on the TOC content in black soil combined with pH value and water content of the soil.The results show that the content of TOC(48samples from cultivated surface soil in Hailun City)rangs from 15.35to 48.45g/kg with an average value of 27.70g/kg,with a coefficient of variation of 26.47%.The spatial distribution of TOC in surface black soil of cultivated land decreases from northeast to southwest.The main iron ores in surface black soil of cultivated land are ferrihydrite and lepidocrocite,and the iron contents range between 3.29-10.52g/kg;the second most are goethite and hematite,and the spatial distribution of these two iron oxides are consistent with that of TOC,showing a significant positive correlation(R2 values being 0.3689and 0.6353,respectively).Besides,there is a little iron in siderite,magnetite,clay ore,and pyrite.The effect of different iron minerals on organic carbon is shown as goethite and hematite>ferrihydrite and lepidocrocite>clay ore>pyrite in surface black soil of Hailun City.

关 键 词：耕地表层黑土 有机碳 铁矿物 空间分布特征 相关关系 海伦市 

分 类 号：X144[环境科学与工程—环境科学] S153.6[农业科学—土壤学]