地理学报 ›› 2017, Vol. 72 ›› Issue (9): 1680-1694.doi: 10.11821/dlxb201709012
麦麦提吐尔逊·艾则孜1,2(), 阿吉古丽·马木提1, 艾尼瓦尔·买买提3, 马国飞1
收稿日期:
2016-11-14
修回日期:
2017-05-19
出版日期:
2017-09-30
发布日期:
2017-09-30
作者简介:
作者简介:麦麦提吐尔逊·艾则孜(1981-), 男, 维吾尔族, 新疆喀什人, 博士后, 副教授, 主要从事干旱区绿洲土壤环境安全研究。E-mail:
基金资助:
EZIZ Mamattursun1,2(), MAMUT Ajigul1, MOHAMMAD Anwar3, Guofei MA1
Received:
2016-11-14
Revised:
2017-05-19
Published:
2017-09-30
Online:
2017-09-30
Supported by:
摘要:
新疆博斯腾湖流域绿洲采集195个农田土壤样品,测定其中As、Cd、Cr、Cu、Mn、Ni、Pb和Zn等8种重金属元素的含量,基于地统计法分析农田土壤重金属空间分布规律,采用污染负荷指数(PLI)和潜在生态风险指数(RI)评价农田土壤重金属污染和潜在生态风险程度,并对重金属的来源进行讨论。结果表明:① 博斯腾湖流域农田土壤Cd、Cr、Cu、Ni、Pb和Zn含量平均值分别超出新疆土壤背景值的1.67倍、1.13倍、1.15倍、1.29倍、2.11倍和1.65倍。② 农田土壤中8种重金属元素空间分布基本呈现岛状分布格局,各金属元素在部分区域出现高值区,表明研究区人类活动对农田土壤环境具有负面效应。③ 农田土壤Pb呈现中度污染,Cd、Cr、Cu、Ni和Zn轻度污染,Mn轻微污染,As无污染。农田土壤重金属污染负荷指数的平均值为1.09,呈现轻度污染态势。④ 各重金属元素单项生态风险指数平均值从大到小依次为:Cd、Ni、As、Cu、Pb、Cr、Zn。综合生态风险指数平均值为18.63,处于轻微生态风险态势。从生态风险程度的区域差异来看,各县生态风险指数从大到小依次为:和硕县、博湖县、焉耆县、和静县。⑤ 农田土壤Cr、Cu、Mn、Ni与Zn主要受到土壤地球化学成因的控制,As、Cd和Pb主要受到人类活动的影响。Cd与Pb是研究区主要的污染因子,研究区农田土壤中Cd与Pb污染必须关注。
麦麦提吐尔逊·艾则孜, 阿吉古丽·马木提, 艾尼瓦尔·买买提, 马国飞. 博斯腾湖流域绿洲农田土壤重金属污染及潜在生态风险评价[J]. 地理学报, 2017, 72(9): 1680-1694.
EZIZ Mamattursun, MAMUT Ajigul, MOHAMMAD Anwar, Guofei MA. Assessment of heavy metal pollution and its potential ecological risks of farmland soils of oasis in Bosten Lake Basin[J]. Acta Geographica Sinica, 2017, 72(9): 1680-1694.
表1
博斯腾湖流域土壤重金属含量统计(n=195)
重金属元素 | As | Cd | Cr | Cu | Mn | Ni | Pb | Zn | pH |
---|---|---|---|---|---|---|---|---|---|
最小值(mg·kg-1) | 0.52 | 0.05 | 33.68 | 19.45 | 312.82 | 19.45 | 0.99 | 38.99 | 7.90 |
最大值(mg·kg-1) | 63.87 | 0.69 | 123.39 | 73.12 | 789.68 | 55.97 | 96.36 | 911.98 | 9.50 |
平均值(mg·kg-1) | 6.57 | 0.20 | 55.71 | 30.58 | 503.50 | 34.37 | 40.92 | 113.69 | 8.56 |
标准差(mg·kg-1) | 6.79 | 0.07 | 11.54 | 6.44 | 61.49 | 6.78 | 23.81 | 141.51 | 0.31 |
变异系数 | 1.03 | 0.35 | 0.21 | 0.21 | 0.12 | 0.19 | 0.58 | 1.24 | 0.03 |
新疆灌耕土背景值(mg·kg-1) | 9.09 | 0.12 | 39.60 | 35.80 | 688.0 | 26.40 | 13.50 | 16.80 | - |
新疆土壤背景值(mg·kg-1) | 11.20 | 0.12 | 49.30 | 26.70 | 688.0 | 26.60 | 19.40 | 68.80 | 8.10 |
国家土壤环境质量Ⅱ级标准(mg·kg-1) | 25.0 | 0.60 | 250.0 | 100.0 | - | 60.0 | 350.0 | 300.0 | - |
超标率(%) | 15.38 | 0.51 | 0 | 0 | - | 0 | 0 | 6.15 | - |
表2
重金属含量的半方差函数理论模型及相关参数
变量 | 理论模型 | 块金值C0 | 基台值C0+C | 基底效应C0/(C0+C) | 变程a/m | 残差平方RSS | 决定系数R2 |
---|---|---|---|---|---|---|---|
As | 指数 | 0.188 | 0.286 | 0.657 | 5434 | 3.77E-04 | 0.813 |
Cd | 指数 | 0.305 | 0.389 | 0.784 | 5266 | 1.51E-04 | 0.803 |
Cr | 球状 | 0.812 | 0.917 | 0.885 | 6120 | 9.51E-04 | 0.895 |
Cu | 指数 | 0.610 | 1.361 | 0.448 | 5191 | 1.44E-03 | 0.910 |
Mn | 指数 | 0.103 | 0.478 | 0.215 | 6413 | 1.87E-04 | 0.824 |
Ni | 指数 | 0.078 | 0.394 | 0.198 | 4664 | 4.93E-04 | 0.971 |
Pb | 球状 | 2.217 | 1.639 | 1.353 | 4314 | 6.43E-03 | 0.692 |
Zn | 高斯 | 0.294 | 0.36 | 0.817 | 7111 | 8.29E-04 | 0.867 |
pH | 球状 | 0.195 | 0.855 | 0.228 | 8266 | 1.38E-04 | 0.946 |
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