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紫色水稻土颗粒有机质对重金属的富集特征
摘要点击 2232  全文点击 863  投稿时间:2016-09-19  修订日期:2016-11-29
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中文关键词  颗粒有机质  有机碳  重金属  紫色水稻土  土壤性质
英文关键词  particulate organic matter (POM)  organic carbon  heavy metals  purple paddy soil  soil properties
作者单位E-mail
李秋言 西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400715
重庆市农业资源与环境研究重点实验室, 重庆 400716 
liqiuyan1991@live.com 
赵秀兰 西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400715
重庆市农业资源与环境研究重点实验室, 重庆 400716 
zxl@swu.edu.cn 
中文摘要
      在重庆合川区和铜梁区随机采集了20个紫色水稻土,将其分成颗粒有机质(0.053~2 mm,POM)、砂粒(0.053~2 mm)和细土(<0.053 mm)这3个组分,通过比较不同组分的有机碳及重金属(Cu、Zn、Pb、Cd)含量和分布状况,研究了紫色水稻土中POM对重金属的富集特征及其与土壤理化性质如pH、CEC、黏粒和土壤有机碳(SOC)等的关系.结果表明,采样区紫色水稻土的POM含量范围为7.31~44.76 g·kg-1,平均值为19.20 g·kg-1,有机碳含量为96.61~263.17 g·kg-1,平均值为151.34 g·kg-1,显著高于原土及其他组分,对土壤有机碳的贡献率为8.63%~48.62%,代表了一大部分土壤有机碳库.POM中的Cu、Zn、Pb和Cd平均富集系数分别为3.35、1.14、2.88和2.14,显著高于其他组分,表现出一定的富集作用,对上述重金属的贡献率分别为6.02%、2.22%、5.24%和3.21%,POM对Cu、Pb的富集能力和贡献率均显著大于Zn和Cd.相关分析结果表明,POM含量与SOC、pH、CEC、黏粒(<0.002 mm)呈显著或极显著正相关,SOC是主要因素.POM-C含量与总量分别与黏粒含量、SOC呈显著相关.POM中重金属总量与SOC、pH、POM-C总量呈显著或极显著正相关,SOC是最关键因子;与其他重金属相比,Zn在POM中的总量与土壤性质的回归系数最高,关系最为密切.
英文摘要
      Twenty purple paddy soil samples were collected from the Prefectures of Hechuan and Tongliang, Chongqing, and sieved into particulate organic matter (0.053-2 mm, POM), sand fraction (0.053-2 mm) and fine soil fraction (<0.053 mm). By comparing the concentration and distribution of soil organic carbon (SOC) and heavy metals among different components, the enrichment characteristics of POM for heavy metals (Cu, Zn, Pb and Zn) and its relationship with soil properties such as pH, CEC, clay content (<0.002 mm) and SOC were investigated. The result showed that the contents of POM fraction in purple paddy soils ranged from 7.31 to 44.76 g·kg-1, with an average level of 19.20 g·kg-1, while the carbon contents ranged from 96.61 to 263.17 g·kg-1, which were significantly higher than those of their original soils and other two fractions. The contribution rates of organic carbon by POM to the total organic carbon of soils ranged from 8.63% to 48.62%, which accounted for a large pool of organic carbon. The average enrichment factors of POM fraction to Cu, Zn, Pb and Cd were 3.35, 1.14, 2.88 and 2.14, respectively. Compared with sand fraction and fine soil fraction, POM fraction showed a significantly higher contribution rate to heavy metals, which were 6.02%, 2.22%, 5.24% and 3.21%. In addition, the enrichment ability and contribution rate of POM to Cu and Pb were obviously greater than those of Zn and Cd. There was a significant positive correlation between content of POM fraction and soil properties such as SOC, pH, CEC and clay content, in which SOC was the key factor. The POM-C content and total amount were significantly correlated with SOC and clay content. The pH value, SOC and POM-C amount had a significant or extremely significant correlation with the amount of heavy metals in POM, in which SOC was the most critical one. Comparing with other heavy metals, the amount of zinc in POM had the highest regression coefficient and the closest relationship with soil properties.

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