紫色水稻土颗粒有机质对重金属的富集特征

发布时间：2018-04-08 08:02

本文选题：颗粒有机质　切入点：有机碳　出处：《环境科学》2017年05期

【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(0.053~2mm)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.
[Abstract]:Twenty purple paddy soils were randomly collected in Hechuan and Tongliang areas of Chongqing. They were divided into three components: granular organic matter (0.0532mm), sand (0.0532mm) and fine soil (0.053mm). The content and distribution of organic carbon and heavy metal (CuCuPbCdCD) of different components were compared.The enrichment characteristics of heavy metals by POM in purple paddy soil and its relationship with soil physical and chemical properties such as pH ~ (2 +) CEC, clay and soil organic carbon (SOC) were studied.The results showed that the range of POM content in purple paddy soil was 7.31g / kg ~ (-1), the average value was 19.20 g / kg ~ (-1) ~ (-1), the organic carbon content was 96.61 ~ (-1) ~ 263.17 g / kg ~ (-1) ~ (-1), the average value was 151.34 g / kg ~ (-1) ~ (-1), which was significantly higher than that of the soil and other components.The contribution rates to the above heavy metals were 6.02% and 3.21%, respectively, and the enrichment ability and contribution rate of POM to Cu ~ (2 +) Pb were significantly higher than those of Zn and CD.The results of correlation analysis showed that the content of POM was significantly or extremely significantly correlated with the pH of SOCN (CEC, 0.002 mm). The content and total amount of POM-C were significantly correlated with the content of clay, and the content of heavy metals in POM was significantly or extremely significantly correlated with the total amount of POM-C in pH of SOCN.Positive correlation SOC is the most important factor.Compared with other heavy metals, the total amount of Zn in POM had the highest regression coefficient with soil properties, and the relationship was the most close.
【作者单位】：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;重庆市农业资源与环境研究重点实验室;
【基金】：国家自然科学基金项目(41471272)
【分类号】：X131.3

【相似文献】