State Key Laboratory of Biocontrol and Guangdong Provincial Key Laboratory of Plant Resource, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, PR China; College of Environment Economics, Shanxi University of Finance & Economics, Taiyuan 030006, PR China.
State Key Laboratory of Biocontrol and Guangdong Provincial Key Laboratory of Plant Resource, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, PR China.
Environ Pollut. 2015 Oct;205:333-9. doi: 10.1016/j.envpol.2015.06.017. Epub 2015 Jun 26.
Heavy metal contamination of agricultural soils is of worldwide concern. Unfortunately, there are currently no efficient and sustainable approaches for addressing this concern. In this study, we conducted a field experiment in which an agricultural soil highly contaminated by cadmium (Cd), lead (Pb) and zinc (Zn) was treated on-site by an ancient agricultural technique, 'slash-and-char', that was able to convert the biomass feedstock (rice straw) into biochar in only one day. We found evidence that in comparison to the untreated soil, the treated soil was associated with decreased bioavailability of the heavy metals and increased vegetable yields. Most importantly, the treatment was also coupled with dramatic reductions in concentrations of the heavy metals in vegetables, which made it possible to produce safe crops in this highly contaminated soil. Collectively, our results support the idea that slash-and-char offers new promise for management of soils contaminated by Cd, Pb and Zn.
农业土壤中的重金属污染是一个全球性的问题。不幸的是，目前还没有有效的、可持续的方法来解决这个问题。在这项研究中，我们进行了一项田间实验，在现场用一种古老的农业技术“刀耕火种”来处理被镉（Cd）、铅（Pb）和锌（Zn）严重污染的农业土壤，这种技术仅用一天就能将生物质原料（稻草）转化为生物炭。我们发现，与未处理的土壤相比，处理过的土壤中重金属的生物可利用性降低，蔬菜产量增加。最重要的是，这种处理方法还伴随着蔬菜中重金属浓度的显著降低，使得在这种高度污染的土壤中生产安全作物成为可能。总的来说，我们的研究结果支持了这样一种观点，即“刀耕火种”为管理受 Cd、Pb 和 Zn 污染的土壤提供了新的希望。
