| 山地平原过渡带耕地土壤重金属空间特征及潜在生态风险因素探析 |
| 摘要点击 2171 全文点击 684 投稿时间：2021-05-13 修订日期：2021-07-23 |
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| 中文关键词 山地平原过渡带 耕地土壤 重金属 空间分布 潜在生态风险 影响因素 |
| 英文关键词 mountain plain transition zone cultivated soil heavy metals spatial distribution potential ecological risk influencing factors |
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| 中文摘要 |
| 为探讨典型山地平原过渡带地区耕地土壤重金属空间分布特征及其潜在生态风险因素.本文以拥有成都平原-龙门山脉过渡带这一典型过渡地形的四川省某县域为研究区，采用地统计法和潜在生态风险指数法分析研究区耕地土壤Cd、Cr、Cu、Pb和Zn的空间分布情况并进行潜在生态风险评价，结合地理探测器进一步发掘导致其潜在生态风险空间差异的主要影响因素.结果表明：①研究区耕地土壤平均ω（Cd）、ω（Cr）、ω（Cu）、ω（Pb）和ω（Zn）为0.39、123.00、31.28、51.04和119.66 mg·kg-1，均超过地区土壤背景值含量的2.60、1.59、1.19、2.00和1.54倍.②研究区耕地土壤Cd和Cr的高值区主要分布于山地区西部、过渡带南部和平原区西部，Cu和Zn的高值区主要分布于山地区西部，Pb高值区主要分布于过渡带南部和平原区西部，5种重金属的低值区均主要分布于过渡区北部.③研究区耕地土壤整体以轻微潜在生态风险为主，各重金属元素的潜在生态风险指数平均值从高到低依次为Cd（32.58） > Pb（3.12） > Cu（2.82） > Cr（1.58） > Zn（0.98），Cd是造成研究区耕地土壤潜在生态风险的主要重金属元素.④不同地形区耕地土壤潜在生态风险的主要影响因素存在显著差异，其中距河流距离与土壤类型是影响山地区的关键因素，复种指数和距工矿距离是影响过渡区的关键因素，土壤pH值与化肥施用量是影响平原区的关键因素. |
| 英文摘要 |
| The purpose of this study was to explore the spatial distribution characteristics and potential ecological risk factors of heavy metal pollution in cultivated soil in the transitional zone of a typical mountain plain. In this study, a county in Sichuan Province, which has the typical transitional topography of the Chengdu Plain-Longmen Mountain transition zone, was taken as the study area. Geostatistics and potential ecological risk index methods were used to analyze the spatial distribution of Cd, Cr, Cu, Pb, and Zn from cultivated land in the study area, and a potential ecological risk assessment was carried out. This was combined with geographical detector analysis to further explore the main influencing factors leading to the spatial difference in potential ecological risk. The results showed that:① The average values of ω(Cd), ω(Cr), ω(Cu), ω(Pb), and ω(Zn) of cultivated land in the study area were 0.39, 123.00, 31.28, 51.04, and 119.66 mg·kg-1, respectively, which were more than 2.60, 1.59, 1.19, 2.00, and 1.54 times the soil background value in the study area. ② The high value areas of Cd and Cr in cultivated land in the study area were mainly distributed in the west of the mountain area, the south of the transition zone, and the west of the plain area; the high value areas of Cu and Zn were mainly distributed in the west of the mountain area; the high value areas of Pb were mainly distributed in the south of the transition zone and the west of the plain area; and the low values of the five heavy metals were mainly distributed in the north of the transition zone. ③ The soil of cultivated land in the study area was dominated by slight potential ecological risk, and the average value of potential ecological risk index of heavy metals was Cd(32.58) > Pb(3.12) > Cu(2.82) > Cr(1.58) > Zn(0.98). Cd was the main factor causing the potential ecological risk of cultivated land in the study area. ④ There were significant differences in the key influencing factors of soil potential ecological risk of cultivated land in different topographic regions of the study area. The distance from the river and the soil type were the key factors affecting the mountain area; the multiple cropping index and the distance from the industry and mine were the key factors affecting the transition zone, and the soil pH value and the amount of chemical fertilizer were the key factors affecting the plain area. |
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