Effects of organic mineral fertiliser on heavy metal migration and potential carbon sink in soils in a karst region  

作　　者：Ping Chen Yulong Ruan Shijie Wang Xiuming Liu Bin Lian 

机构地区：[1]Puding Karst Ecosystem Observation and Research Station,State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry, Chinese Academy of Sciences [2]Jiangsu Provincial Key Laboratory for Microbes and Functional Genomics, College of Life Sciences, Nanjing Normal University

出　　处：《Acta Geochimica》2017年第3期539-543,共5页地球化学学报（英文）

基　　金：funded by National Natural Science Foundation of China(41373078);National Major Scientific Research Program(2013CB956702);Key Project of Natural Science Research in Colleges and Universities in Jiangsu Province(Grant No.16KJA180003)

摘　　要：Heavy metal pollution in karst mountainous area of Guizhou has spread due to the long-term exploitation of mineral resources and the improper disposal of environmentally hazardous waste. Heavy metals are characterised by non-degradation, strong toxicity, and constant accumulation, posing a grave threat to karst mountain fragile soil ecosystem. To reduce the harm caused by heavy metal pollution and damage to agricultural products, research was undertaken on the basis of previous work by simulating pot experiments on pak choi cabbage(Brassica rapa chinensis)planted in Cd-contaminated soil: different amounts of organic mineral fertilisers(OMF) compared with chemical fertiliser(CF) were used and by detecting the amount of heavy metal in the mature vegetable, a better fertilisation strategy was developed. The results showed that the Cd content in vegetables grown with CF was 23.70 mg/kg,while that of vegetables grown with OMF and bacterial inoculant was the lowest at 15.13 mg/kg. This suggests that the use of OMF and microbes in karst areas not only promotes plant growth but also hinders plant absorption of heavy metal ions in the soil. In addition, through the collection of pot leachate, the detection of water chemistrycharacteristics, and the calculation of the calcite saturation index, it was found that the OMF method also induces certain carbon sink effects. The results provide a new way in which rationalise the use of OMFs in karst areas to alleviate soil heavy metal pollution and increase soil carbon sequestration.Heavy metal pollution in karst mountainous area of Guizhou has spread due to the long-term exploitation of mineral resources and the improper disposal of environmentally hazardous waste. Heavy metals are characterised by non-degradation, strong toxicity, and constant accumulation, posing a grave threat to karst mountain fragile soil ecosystem. To reduce the harm caused by heavy metal pollution and damage to agricultural products, research was undertaken on the basis of previous work by simulating pot experiments on pak choi cabbage（Brassica rapa chinensis）planted in Cd-contaminated soil： different amounts of organic mineral fertilisers（OMF） compared with chemical fertiliser（CF） were used and by detecting the amount of heavy metal in the mature vegetable, a better fertilisation strategy was developed. The results showed that the Cd content in vegetables grown with CF was 23.70 mg/kg,while that of vegetables grown with OMF and bacterial inoculant was the lowest at 15.13 mg/kg. This suggests that the use of OMF and microbes in karst areas not only promotes plant growth but also hinders plant absorption of heavy metal ions in the soil. In addition, through the collection of pot leachate, the detection of water chemistrycharacteristics, and the calculation of the calcite saturation index, it was found that the OMF method also induces certain carbon sink effects. The results provide a new way in which rationalise the use of OMFs in karst areas to alleviate soil heavy metal pollution and increase soil carbon sequestration.

关 键 词：Karst Soil pollution Cd Organic mineral fertilisers Carbon sink 

分 类 号：S14[农业科学—肥料学] X53[农业科学—农业基础科学]