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1.
《Communications in Soil Science and Plant Analysis》2012,43(4):703-715
Abstract Experiments were conducted to seek a better basis for soil testing of rice paddy soils. Soils were incubated under variable conditions of simulated flooding, and then extracted with DTPA5 . The amounts of Cu, Zn, Mn and Fe extracted were sensitive to the imposed soil conditions. Good correlations between Zn extracted from simulated flooded soils and Zn uptakes by rice from flooded soils in pots, suggest that this approach to soil testing may be more useful for paddy soils than existing tests on air dried soils. 相似文献
2.
内蒙古草原白乃庙铜矿区土壤重金属污染特征研究 总被引：4，自引：0，他引：4
对位于内蒙古荒漠草原上的白乃庙铜矿采选矿区土壤和尾矿区周围土壤重金属污染状况进行了调查研究。结果表明,矿区土壤中Cu、Cr、Ni、Fe和Mn浓度均高于内蒙古土壤平均值。单因子指数法评价结果表明,五个调查区域土壤都受到了重金属Cu、Cr、Ni、Mn、Fe的污染,其中Cu为重污染,Cr、Ni、Mn、Fe为轻污染,Pb为安全级别,Zn和As只对某些区域有轻污染。综合污染指数法评价结果表明,五个调查区域的土壤重金属污染等级均属重污染,主要贡献元素是Cu,其次是Cr、Ni、Mn、Fe,这与尾矿砂中这些重金属的浓度是相对应的。由于周边地形复杂,多为低山丘陵,所以该地区主导风向对于尾矿库区不同方向土壤重金属污染水平的影响差异并不显著。 相似文献
3.
复合污染土壤中水稻根际元素特性及效应研究 总被引：1，自引：1，他引：0
【目的】以广东大宝山重金属复合污染农田为生长介质,通过研究水稻不同部位生长量、 金属含量、 对金属的富集系数,及其与根际、 非根际土金属含量、 形态变化的相关关系,探讨根际效应可能对水稻体内金属积累转运以及生物量的影响。【方法】选取了广东大宝山稻田重金属复合污染(As、 Pb、 Fe、 Cu、 Zn)土壤及当地常见的20个水稻品种进行根际袋试验,即将根际袋内的土视为根际土,根际袋外的土视为非根际土,将供试水稻品种种植于根际袋土壤中60天后收获,测定水稻各部位的生长量、 不同金属的含量,根际土和非根际土中各金属有效态的含量。【结果】Fe、 Cu、 Pb、 Zn、 As在根部的富集系数均大于其在茎叶的富集系数,各金属在茎叶和根部的富集能力排序分别为Zn Cu As ≈ Pb ≈ Fe和Fe Zn As Cu Pb。根际土和非根际土中各种金属有效态含量均为Fe Cu Pb Zn As。研究还发现,有效态Fe、 Cu和Zn浓度对整株干重的影响显著,作用强弱顺序为Cu Zn Fe,对水稻生长影响作用显著的三种有效态金属Fe、 Cu和Zn均为植物生长所必需的元素。供试土壤中有效态Cu浓度对水稻的生长所起的作用最强。根际土有效态Fe浓度对根系Fe的积累作用效果显著,有效态As浓度显著抑制了根系Fe的积累,且有效态As浓度的作用强于有效态Fe。【结论】根际土中有效态Fe对株高、 根干重、 茎叶干重和整株干重均起着抑制作用,有效态Cu对水稻生长起到了促进作用。根际土有效态As和非根际土有效态Zn对根部Fe的积累起到了抑制作用,根际土有效态Fe和非根际土有效态Cu则起到了促进作用。非根际土有效态Fe和有效态Zn对水稻根长的增加均起到了促进作用。 相似文献
4.
为判识湖泊沉积物中重金属的地球化学行为特征及其控制因素,以包头市南海湖为研究对象,采用连续提取法,系统开展了沉积物中生物有效态重金属的分布研究。结果表明,表层沉积物中重金属生物有效态（前4态之和）的平均比例序列为Cd〉Pb〉Zn〉Cu;Cu的生物有效态占总量的比例为23%,Pb为75%,Zn为42%,Cd为83%。总体而言,表层沉积物中Cd和Pb的潜在危害性最大。湖心区、西南和东北部湖区为表层沉积物中Cu、Pb和Zn的生物有效态含量高值区,Cd仅在西南湖区表现高值。有机物结合态为沉积物柱芯中Cu和Cd生物有效态的主导形态,铁锰氧化物结合态为Pb和Zn生物有效态的主导形态。强还原性条件下,沉积物中以铁锰氧化物结合态为主导形态的Pb、Zn、Cd有一定的潜在风险,Cu的潜在危害较小。与黄河沉积物重金属形态百分比的对比分析表明,南海湖沉积物对重金属的固定能力更强。 相似文献
5.
Mahnaz Pirzadeh Majid Afyuni Amirhossein Khoshgoftarmanesh Rainer Schulin 《Biology and Fertility of Soils》2010,46(4):317-322
Modern agricultural systems have to provide enough micronutrient output to meet all the nutritional needs of people. Accordingly,
knowledge on micronutrient status in soil and crop edible tissues is necessary. This study was carried out to investigate
zinc (Zn), iron (Fe), manganese (Mn), and copper (Cu) concentration of calcareous paddy soil and the relative rice grain.
Rice crops (straw, hull, and grain) and associated surface soils (0–25 cm) were collected from 136 fields and analyzed for
total and diethylene triamine pentaacetic acid (DTPA) available Zn, Fe, Mn, and Cu. The DTPA-Zn concentration in more than
50% of paddy soils was less than its critical deficiency concentration (2 mg kg−1), while the concentrations of DTPA Fe, Mn, and Cu were sufficient. The grain Zn concentration of more than 54% of the rice
samples was less than 20 mg kg−1. About 55% and 49% of the rice samples were deficient in Mn and Cu, respectively, while the Fe concentration in rice grains
was sufficient. A significant negative correlation was found between the CaCO3 content and soil DTPA-extractable Zn, Fe, Mn, and Cu. There were significant relationships between the total soil phosphorus
and DTPA-extractable micronutrient concentrations. By considering the average daily rice consumption of 110 g per capita,
the Zn, Fe, Mn, and Cu intake from rice consumption was estimated to be 2.4, 7.7, 1.6, and 0.7 mg for adults, respectively. 相似文献
6.
水稻子实对不同形态重金属的累积差异及其影响因素分析 总被引：3，自引：0，他引：3
在分析成都平原核心区土壤重金属(Cd、Cr、Pb、Cu、Zn)全量、各形态含量及相应点位种植的水稻子实重金属含量的基础上,通过统计分析、空间插值及线性回归方程的模拟,研究了土壤Cd、Cr、Pb、Cu、Zn全量的空间分布状况、各形态重金属含量统计特征,以及水稻子实对重金属各形态的累积差异及其影响因素。结果表明,成都平原水稻土重金属污染较轻,除Cd外,均低于国家土壤环境质量二级标准。土壤中重金属的可交换态含量均较低,Cd主要以铁锰氧化态存在,Cr、Cu、Zn、Pb主要以残渣态存在。水稻子实对5种重金属的累积效应顺序为:Cd>Zn>Cu>Pb>Cr。与水稻重金属累积关系密切的重金属活性形态(可交换态、碳酸盐结合态、铁锰氧化物结合态和有机物结合态)主要有:Cd的碳酸盐结合态、Cr的可交换态、Pb的有机物结合态和Cu的碳酸盐结合态含量;Zn各活性形态对水稻子实含量的影响不明显。土壤理化性质对不同活性形态重金属元素的影响效应各不相同。活性态Cd主要受有机质、pH和容重的影响;活性态Cr与pH、有机质、CEC和容重密切相关;活性态Pb与有机质、容重、中细粉粒、砂粒等均有密切的关系;Cu的活性主要受粘粒、有机质含量的影响;Zn的有效性主要受pH、有机质、砂粒、容重的影响。总的看来,对土壤Cd、Cr、Pb、Cu、Zn各活性形态含量影响效应较强的是有机质、pH、容重,而与土壤吸附性能密切相关的颗粒组成、CEC的影响不甚明显。 相似文献
7.
Paweena Panichayapichet Suwanchai Nitisoravut Wijarn Simachaya Arpa Wangkiat 《Water, air, and soil pollution》2008,194(1-4):259-273
The enrichment factor, multivariate analysis and metal speciation studies were used to identify degree, source and dispersal of metal contamination in Khli Ti watershed, Thailand. Topsoil samples were collected throughout the watershed, analyzed for total metal concentration. Sequential extraction was also carried out to determine geochemical phases of metals which were identified as exchangeable and bound to carbonates, Fe–Mn oxides, organic matter and residuals. Soil characteristics including pH, total organic carbon, redox potential, cation exchange capacity and texture were also analyzed. Principal component analysis yielded three metal groups which explained 83% of the variance. The concentrations of metals which were derived from lithogenic origin, such as Co, Cr, Fe, Ni and V were in natural background levels and were mostly bound to the residual phase. The remaining elements (i.e. Ba, Cd, Cu, Pb, Sb and Zn) were associated with the contamination from previous activities of the Pb-ore concentrator and Zn–Pb mining. Anthropogenic contamination mainly increased Pb and Zn bound to Fe–Mn oxides at the expense of residual fraction. Even though low exchangeable Pb contents in Khli Ti soils indicated low availability to plants, Pb bound to Fe–Mn oxides fraction might increase its mobility under reducing conditions. 相似文献
8.
《Communications in Soil Science and Plant Analysis》2012,43(13-14):1975-1996
Abstract A study was carried out to investigate the status of four micronutrients, iron (Fe), copper (Cu), manganese (Mn), and zinc (Zn), and five other trace elements, cobalt (Co), chromium (Cr), nickel (Ni), lead (Pb), and strontium (Sr), in paddy soils of Bangladesh. Soil samples were digested by hydrofluoric acid (HF)‐nitric acid (HNO3)‐perchloric acid (HClO4) for determination of total contents of the nine elements, while DTPA, ASI and 0.1 Mhydrochloric acid (HC1) methods were used for determination of available Fe, Cu, Mn, and Zn. Total trace element contents were found to vary with physiography on which soils are distributed. In general, Ganges Tidal Floodplain soils had the highest content, whereas terrace soils had the lower content. Among the soil properties examined, clay content had a good relation with total trace element contents in the topsoil, except for Sr. Based on the variation with physiography or clay content, the nine trace elements could be grouped into six groups: Cu, Fe and Zn, Pb, Co and Cr and Ni, Mn, Sr. According to the extractable levels of four micronutrients, Bangladesh paddy soils had the medium to optimum amounts of Fe and Cu, but were deficient sporadically in Mn and extensively in Zn. It was indicated that paddy soils of Bangladesh are yet to be polluted with heavy metals. 相似文献
9.
A statistical evaluation of 5 338 analysis of freshwaters from little polluted stream basins in the Czech Republic indicated a relationship between the Pb, Cu, Zn, Cd, Be, As, Mn, Sr, F? and Fe concentrations and the pH, over a range of pH 3.6 to 9.6. Except for Sr, the median concentrations of all the trace metals increase with decreasing pH, but the increase never extends over the whole studied acidic range (pH 3.6 to 7.0). Acid deposition related mobilization of Mn and Be into freshwaters explains the sharp increase in their concentrations with decreasing pH. Cadmium and Zn are also mobilized n strongly acidic environment. The concentrations of Be, As, F? and Mn in strongly acidic waters and those of Zn and Cd in weakly acidic ones are considerably higher in areas receiving a higher atmospheric loading. For Be and Mn, the higher concentrations are caused by higher acid deposition rates, while for As and F?, the concentrations are probably greater due to higher atmospheric deposition of these elements over more intensely acontaminated areas of the Czech Republic. In extremely acidic waters (pH < 4.2), the concentrations of Mn, Be, Cd, Zn and Al no longer increase with decreasing pH; on the contrary, those of Mn and Be actually decrease. This seems to be primarily caused by a decrease in their concentrations within the surface horizons of soils and vegetation induced by prolonged leaching. The Cd and Zn concentrations are independent of pH over an interval of pH 5.4 to 6.0 and thus the increase in the mean concentrations of Cd and Zn with decreasing pH involves two separate stages, at pH > 6.0 and at pH < 5.4. The concentrations of Cu in acid freshwaters are controlled by both the presence of high molecular weight organics plus biota uptake and by their atmospheric deposition levels; the concentrations of As and Pb are in addition controlled by sorption on Fe - oxyhydroxides. These elements accumulate in the topsoil, even under conditions of severe acidification. The surprisingly lower concentrations of Pb and Cu were found in acidic waters of more contaminated areas. 相似文献
10.
Forty-five acid sulfate topsoil samples (depth < 0.5 m) from 15 soil cores at 11 locations along the New South Wales coast, Australia, were selected to investigate the chemical behavior of Zn, Mn, Cr, Co and Pb in these soils. The amount of HCl-extractable Mn was much smaller than the mean value of the total Mn documented for other soils. This may be attributed to enhanced mobilization of Mn from the soils under the extremely acidic and seasonally flooded conditions encountered in the investigated soils. The pH-dependency of soluble Zn and Mn was strongly affected by the availability of acid reactive Zn and Mn compounds. There were fairly good relationships between soluble Zn and acid reactive Zn compounds, and between soluble Mn and acid reactive Mn compounds. Soluble Zn and soluble Mn concentrations were important controls on exchangeable Zn and Mn concentrations, respectively. In contrast to the suggestion by other authors that adsorption of Co was closely associated with Mn oxides present in soils, the exchangeable Co in the investigated acid sulfate soils was not clearly related to the abundance of Mn minerals. In addition to the fact that there are few Mn minerals present in the soils, this might also be because the availability of cation exchange sites on the crystal surfaces of Mn oxides was reduced under extremely acidic conditions. 相似文献
11.
以大冶典型铜矿区为中心,辐射周边农田,探索农田土壤重金属污染特征及重金属在油菜中的积累变化规律。结果表明,以湖北省土壤背景值进行评价,土壤受到重金属不同程度的污染,其中Cd严重超标,Cu次之;采用国家二级标准进行评价,Zn、Cr和Pb未对土壤造成污染。进行内梅罗综合污染指数法评价发现,以土壤背景值为评价标准,各采样点均达到重金属严重污染水平;以国家二级标准评价时,只有2号采样点土壤属于中度污染水平,其他样点土壤都受到了较为严重的重金属污染。矿区农田油菜各部位重金属含量变化幅度较大,包括Cu、Pb、Zn、Cd和Co在内的5种重金属含量分布规律都是茎叶〉籽粒≈根,Mn则是籽粒〉茎叶〉根。油菜地上部植株中Cu、Pb、Zn、Cd含量均超出食品卫生标准最高限值,且Cd、Pb超标倍数远大于Cu、Zn。富集系数变化规律为Mn〉Zn〉Cd〉Ni〉Cu〉Pb垌Co。 相似文献
12.
13.
为了研究煤矿外排固体废物的污染特征及其潜在生态危害,采用6种不同pH值的浸提剂对贵州4个煤矿区的煤矸石、煤泥和原煤进行了振荡浸提试验,探讨了浸出液的pH、EC和Fe、Mn、Cu、Zn、Pb、Cd6种重金属含量随浸提剂pH值的变化规律。结果表明,随着浸提剂的pH值逐渐升高,浸出液的pH值也逐渐升高,其EC逐渐下降,当pH值大于4.0以后逐步趋于稳定;所有重金属在强酸性环境中浸出量较大,并随pH值的增大呈下降趋势,浸出液中Fe、Mn的浓度普遍较高。3类样品中,煤矸石在酸性条件下其重金属的潜在浸出能力强,环境污染风险大。 相似文献
14.
利用Illumina高通量测序对复合重金属污染下根际和非根际稻田土壤细菌的研究 总被引：2，自引：0，他引：2
There is an increasing concern about rice (Oryza sativa L.) soil microbiomes under the influence of mixed heavy metal contamination.We used the high-throughput Illumina MiSeq sequencing approach to explore the bacterial diversity and community composition of soils in four paddy fields,exhibiting four degrees of mixed heavy metal (Cd,Pb and Zn) pollution,and examined the effects of these metals on the bacterial communities.Our results showed that up to 2 104 to 4 359 bacterial operational taxonomic units (OTUs) were found in the bulk and rhizosphere soils of the paddy fields,with the dominant bacterial phyla (greater than 1％ of the overall community) including Proteobacteria,Actinobacteria,Firmicutes,Acidobacteria,Gemmatimonadetes,Chloroflexi,Bacteroidetes and Nitrospirae.A number of rare and candidate bacterial groups were also detected,and Saprospirales,HOC36,SC-I-84 and Anaerospora were rarely detected in rice paddy soils.Venn diagram analysis showed that 174 bacterial OTUs were shared among the bulk soils with four pollution degrees.Rice rhizosphere soils displayed higher bacterial diversity indices (ACE and Chao 1) and more unique OTUs than bulk soils.Total Cd and Zn in the soils were significantly negatively correlated with ACE and Chao 1,respectively,and the Mantel test suggested that total Pb,total Zn,pH,total nitrogen and total phosphorus significantly affected the community structure.Overall,these results provided baseline data for the bacterial communities in bulk and rhizosphere soils of paddy fields contaminated with mixed heavy metals. 相似文献
15.
通过野外采样和实验室分析,在分析土壤基本理化性质的基础上,重点研究宝鸡长青镇铅锌冶炼厂周边土壤中重金属元素的含量和形态特征,并进行了污染评价。结果表明,宝鸡长青镇铅锌冶炼厂周边土壤中Cu、Pb、Zn、Mn、Co、Ni、Cr的平均含量分别为31.8、41.3、102.6、704.6、14.4、37.4、83.2mg·kg-1,均高于陕西省和全国土壤元素背景值,尤其是Cu、Pb和Zn。土壤中Cu、Zn、Ni和Cr主要以残余态的形式存在,Pb、Mn和Co主要以可还原态和残余态的形式存在,重金属的迁移顺序为Mn（63.91%）〉Pb（60.08%）〉Co（51.70%）〉N（i37.12%）〉Zn（32.09%）〉C（r30.58%）〉Cu（19.95%）,其中,Mn、Pb和Co有50%~65%可以发生迁移,易被生物体利用,危害较大。评价结果表明,宝鸡长青镇铅锌冶炼厂周边土壤主要受到了Pb的轻度污染。 相似文献
16.
杭州市城市土壤重金属的潜在可淋洗性研究 总被引：23，自引：0，他引：23
研究了杭州市城市土壤 8个重金属元素 (Cd、Co、Cr、Cu、Ni、Pb、Zn、Mn)的含量、形态和潜在可淋洗性。结果表明 ,该城市土壤中Cd、Cr、Cu、Ni、Pb、Zn和Mn均有明显的积累 ,其中Cd、Co、Cr和Ni主要以稳定的残余态为主 ,而Cu、Pb、Zn和Mn则以可提取态为主 ,因此在强还原、强酸性或有利于有机质分解条件下Cu、Pb、Zn、Mn的释放潜力较高。用荷兰能源研究中心的淋洗方法 (pH4 0 )测试表明 ,该市城市土壤的重金属可淋洗性较低 ,在一般条件下该城市土壤重金属不会有较大的释放 ,这与该城市土壤中酸可提取态重金属比例较低并含有较高的有机质及粘粒含量有关 相似文献
17.
通过测定宜兴地区34个采样点水稻糙米和不同土层（0～20、20～40、40～60和60～80cm）中Pb、Cd、Cu和Zn含量,利用单项污染指数法和内梅罗污染指数法对土壤表层和糙米重金属含量进行评价,同时分析4种重金属在土壤剖面中的分布规律以及在糙米中的富集特性。结果表明,水稻土表层Ph、Cd、Cu和Zn的平均含量都处于未污染水平,综合评价结果属于清洁（安全）等级;糙米Ph、Cd、Cu和Zn的平均含量也都处在未污染水平,综合评价结果也属清洁（安全）等级。水稻土Ph和Cd的剖面分布属于表层富集型,表层主要受人类活动的影响,而下层跟母质有关;Cu和Zn的剖面分布同属均匀分布型,表层含量略高与人为因素有关,20～40cm和40～60cm含量略低,可能是因为水稻的吸收作用,60—80cm含量比上层都稍高,主要是受成土母质的影响。糙米中4种元素的富集能力存在极显著差异,其大小顺序为Zn（0.282）〉Cd（0．234）〉Cu（0．198）〉Pb（0．014）;糙米Pb、Cd、Cu和Zn的含量与土壤表层相应元素的全量具有极显著的正相关关系,相关系数分别达到0．905、0．925、0．939和0．957;糙米中Cd与Cd／Zn比具有极显著的正相关关系（0．837）,糙米Cd／Zn比为0．002,远低于临界值0．015。 相似文献
18.
《Communications in Soil Science and Plant Analysis》2012,43(8):905-919
Long-term irrigation with municipal wastewater may lead, even in spite of intense farming, to an accumulation of organic matter, nutrient elements, and trace metals in soils. Excessive increases of heavy metals may pose a potential risk to the food chain and provoke restrictions for the further cultivation of sensitive crops. Copper (Cu), zinc (Zn), and lead (Pb) forms in soils under long-term irrigation (for 100–120 years) with treated wastewater of Wroclaw were investigated by using selective seven-step sequential extraction (procedure of Zeien-Bruemmer) for partitioning the metals into operationally defined fractions, likely to be released in solution under various environmental conditions. The largest fraction of Cu, Pb, and particularly Zn in nonirrigated (control) soils was strongly bound in a residual form, while the percentage of exchangeable and the most labile fractions were negligible. Total concentration of metals in irrigated soils was elevated, and significant redistribution of metals among phases was observed. Percentages of residual fraction of Cu and Pb were no more than 25% (Zn < 40%), while significantly increased contribution of fractions occluded on iron (Fe) oxides and organically bound Cu. Exchangeable and readily mobile forms of Zn are predominant zinc fractions in soils irrigated with wastewater. 相似文献
19.
Influence of pH on the redox chemistry of metal (hydr)oxides and organic matter in paddy soils 总被引：1，自引：0，他引：1
Yunyu Pan Gerwin F. Koopmans Luc T. C. Bonten Jing Song Yongming Luo Erwin J. M. Temminghoff Rob N. J. Comans 《Journal of Soils and Sediments》2014,14(10):1713-1726
Purpose
The primary purpose of this study was to determine how flooding and draining cycles affect the redox chemistry of metal (hydr)oxides and organic matter in paddy soils and how the pH influences these processes. Our secondary purpose was to determine to what extent a geochemical thermodynamic equilibrium model can be used to predict the solubility of Mn and Fe during flooding and draining cycles in paddy soils.Material and methods
We performed a carefully designed column experiment with two paddy soils with similar soil properties but contrasting pH. We monitored the redox potential (Eh) continuously and took soil solution samples regularly at four depths along the soil profile during two successive flooding and drainage cycles. To determine dominant mineral phases of Mn and Fe under equilibrium conditions, stability diagrams of Mn and Fe were constructed as a function of Eh and pH. Geochemical equilibrium model calculations were performed to identify Mn and Fe solubility-controlling minerals and to compare predicted total dissolved concentrations with their measured values.Results and discussion
Flooding led to strong Eh gradients in the columns of both soils. In the acidic soil, pH increased with decreasing Eh and vice versa, whereas pH in the alkaline soil was buffered by CaCO3. In the acidic soil, Mn and Fe solubility increased during flooding due to reductive dissolution of their (hydr)oxides and decreased during drainage because of re-oxidation. In the alkaline soil, Mn and Fe solubility did not increase during flooding due to Mn(II) and Fe(II) precipitation as MnCO3, FeCO3, and FeS. The predicted levels of soluble Mn and Fe in the acidic soil were much higher than their measured values, but predictions and measurements were rather similar in the alkaline soil. This difference is likely due to kinetically limited reductive dissolution of Mn and Fe (hydr)oxides in the acidic soil. During flooding, the solubility of dissolved organic matter increased in both soils, probably because of reductive dissolution of Fe (hydr)oxides and the observed increase in pH.Conclusions
Under alternating flooding and draining conditions, the pH greatly affected Mn and Fe solubility via influencing either reductive dissolution or carbonate formation. Comparison between measurements and geochemical equilibrium model predictions revealed that reductive dissolution of Mn and Fe (hydr)oxides was kinetically limited in the acidic soil. Therefore, when applying such models to systems with changing redox conditions, such rate-limiting reactions should be parameterized and implemented to enable more accurate predictions of Mn and Fe solubility. 相似文献20.
贵阳市城区土壤重金属分布特征及污染评价 总被引：12，自引：0，他引：12
调查了贵阳市不同功能区表层土壤中重金属含量及其分布特征,以基线为参比值,采用Hakanson潜在生态危害指数法对重金属的潜在生态风险进行了评价。结果表明,贵阳市城区土壤重金属(Hg、Cd、As、Pb、Cr、Cu、Ni、Zn)主要来源于工业、交通以及燃煤等活动,其平均含量分别为0.108、0.320、20.53、22.17、35.71、64.87、48.65、217.90mg/kg,除Cr外,均显著高于相应基线。工矿区土壤中Pb、Zn含量显著高于其他功能区(p0.05)。Hg和Cd是主要的生态危害因子,其污染已达强生态危害水平,其余均显示为轻微生态危害水平;不同功能区土壤重金属污染均已达强生态危害水平,且污染程度依次是:商务区工矿区文教区居民区城市绿地交通区。 相似文献