Gu Jiao-Feng, Zhou Hang, Jia Run-Yu, Wang Qian-Qian, Li Hong-Cheng, Zhang Ping, Peng Pei-Qin, Liao Bo-Han
College of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China.
Hunan Engineering Laboratory for Control of Rice Quality and Safety, Central South University of Forestry and Technology, Changsha 410004, China.
Huan Jing Ke Xue. 2018 Apr 8;39(4):1910-1917. doi: 10.13227/j.hjkx.201708206.
An paddy field experiment was carried out to study the influence of a tribasic amendment (QFJ, hydroxyapatite+zeolite+biochar) on Cd and As accumulation and translocation in rice grown in soil contaminated with cadmium and arsenic, with the concentrations of soil Cd and As being 3.58 mg·kg and 124.79 mg·kg, respectively. The results showed that, after application of QFJ, the pH, CEC, and OM contents of the rice rhizosphere soil tended to increase. The exchangeable concentrations of Cd and As were reduced from 0.37 mg·kg and 0.07 mg·kg to 0.12 mg·kg and 0.04 mg·kg, respectively. The concentrations of Cd and As in rice tissues decreased after restoration. When 9.00 t·hm of QFJ was applied, the Cd concentration in brown rice was reduced from 0.46 to 0.18 mg·kg, and that of inorganic As was reduced from 0.25 to 0.16 mg·kg, both lower than 0.2 mg·kg, meeting the requirement set by the National Food Standards (GB 2762-2012). QFJ application decreased the Cd and As bioaccumulation capacity of the roots and decreased the rice plant's capacity of Cd translocation quantity from the underground parts to the aerial parts; at same time, the Cd transferring capacity of the roots and the As transferring capacity in straw and husk were also decreased.
开展了一项稻田试验，以研究三元改良剂（QFJ，羟基磷灰石+沸石+生物炭）对镉和砷污染土壤中种植的水稻镉和砷积累及转运的影响，土壤镉和砷浓度分别为3.58 mg·kg和124.79 mg·kg。结果表明，施用QFJ后，水稻根际土壤的pH值、阳离子交换量和有机质含量呈上升趋势。镉和砷的交换性浓度分别从0.37 mg·kg和0.07 mg·kg降至0.12 mg·kg和0.04 mg·kg。修复后水稻组织中镉和砷的浓度降低。当施用9.00 t·hm的QFJ时，糙米中的镉浓度从0.46降至0.18 mg·kg，无机砷浓度从0.25降至0.16 mg·kg，均低于0.2 mg·kg，符合国家食品标准（GB 2762-2012）的要求。施用QFJ降低了根系对镉和砷的生物积累能力，降低了水稻植株将镉从地下部分转运到地上部分的能力；同时，根系对镉的转运能力以及稻草和稻壳中砷的转运能力也有所降低。
