Zhou Li-Jun, Wu Lin, Lin Xiao-Bing, Wang Hui-Ming, Liu Hui, Zhang Hong-Yan, Hu Min, Shi Li-Ping, Zhang Yun, Huang Qian-Ru
National Red Soil Improvement Engineering Technology Research Center, Jiangxi Institute of Red Soil, Jinxian 331717, China.
Agricultural Ecology and Resource Protection Station of Jiangxi, Nanchang 330046, China.
Huan Jing Ke Xue. 2019 Nov 8;40(11):5098-5106. doi: 10.13227/j.hjkx.201905053.
Four soil conditioners, SAMMNS, CCT01, Mineral, and Tebeigai were selected for this study. The effects of the four conditioners on soil pH, bulk density, organic matter, available nutrients, texture, microaggregates, Cd available in soil, and Cd content in brown rice were investigated using field-controlled cadmium tests conducted in cadmium-contaminated paddy fields in Pingxiang. The results showed that compared to the control, soil conditioners could increase pH, bulk density, and cation exchange capacity in soil. SAMMNS and CCT01 soil conditioners increased the amount of silt and clay, but that of sand decreased, whereas the Mineral and Tebeigai soil conditioners decreased silt and clay, and sand increased. In addition to the CCT01 soil conditioner, the application of soil conditioners increased large-scale agglomerates and reduced small-scale microaggregates. The effects of soil conditioners on soil physical and chemical properties promoted the conversion of Cd from contaminated soil from high activity to low activity, which reduced available Cd content in soil (5.21%-34.78%) and Cd content in brown rice (51.39%-68.06%). Correlation analysis showed that Cd content in brown rice was significantly positively correlated with available Cd and available phosphorus in soil, whereas it was negatively correlated with pH and bulk density in soil. Considering the effects of soil and brown rice on cadmium reduction and physicochemical properties, Tebeigai soil conditioner exhibited the best repair effects, followed by SENMES and Mineral soil conditioner.
本研究选用了四种土壤改良剂，即SAMMNS、CCT01、Mineral和特贝盖。通过在萍乡镉污染稻田进行的田间控镉试验，研究了这四种改良剂对土壤pH值、容重、有机质、有效养分、质地、微团聚体、土壤中有效镉以及糙米中镉含量的影响。结果表明，与对照相比，土壤改良剂可提高土壤的pH值、容重和阳离子交换量。SAMMNS和CCT01土壤改良剂增加了粉粒和黏粒含量，砂粒含量降低，而Mineral和特贝盖土壤改良剂降低了粉粒和黏粒含量，砂粒含量增加。除CCT01土壤改良剂外，施用土壤改良剂增加了大团聚体数量，减少了小尺度微团聚体数量。土壤改良剂对土壤理化性质的影响促进了镉从污染土壤中的高活性向低活性转化，降低了土壤中有效镉含量（5.21%-34.78%）和糙米中镉含量（51.39%-68.06%）。相关性分析表明，糙米中镉含量与土壤中有效镉和有效磷显著正相关，与土壤pH值和容重显著负相关。综合考虑土壤和糙米对镉的削减效果及理化性质，特贝盖土壤改良剂修复效果最佳，其次是SENMES和Mineral土壤改良剂。
