Chi Sun-Lin, Xu Wei-Hong, Xiong Shi-Juan, Wang Wei-Zhong, Qin Yu-Li, Zhao Wan-Yi, Zhang Chun-Lai, Li Yan-Hua, Li Tao, Zhang Jin-Zhong, Xiong Zhi-Ting, Wang Zheng-Yin, Xie De-Ti
College of Resources and Environmental Sciences, Southwest University, Chongqing 400715, China.
College of Resources and Environmental Sciences, Wuhan University, Wuhan 430079, China.
Huan Jing Ke Xue. 2017 Apr 8;38(4):1654-1666. doi: 10.13227/j.hjkx.201610095.
Soil incubation experiment and pot experiment were carried out to investigate the influence of nano zeolite (NZ) and ordinary zeolite (OZ) on the soil pH, cation exchange capacity, concentration of soil Cd, soil Cd fraction and Cd uptake by Chinese cabbage when exposed to different Cd pollution levels(1, 5, 10 and 15 mg·kg). The results of soil incubation experiment showed that the nano zeolite and ordinary zeolite dose(5, 10 and 20 g·kg) increased the soil pH and cation exchange capacity, and decreased the concentration of soil exchangeable Cd, while increased the concentration of Cd in carbonate, Fe-Mn oxide, organic matter and residual fraction. The lowest EX-Cd was observed in the high nano zeolite (20 g·kg) treatment. The soil pH and cation exchange capacity was extremely negatively correlated with the concentration of soil exchangeable Cd(<0.01),and extremely positively correlated with the concentration of soil Fe-Mn oxide Cd(<0.01). The results of pot experiment showed that the FDC of exchangeable Cd in soil decreased by 6.4%-63.2%, and the FDC of water-extractable and ethnol-extractable Cd in Chinese cabbage decreased by 2.1%-56% and 11.8%-100% with zeolite application, respectively. Moreover, the reduction effect of nano zeolite on Cd concentration in soil and plant was better than that of ordinary zeolite. The FDC of Cd fraction in shoot of Chinese cabbage showed correlation with the FDC of carbonate Cd and organic matter Cd in soil(<0.05) when exposed to 1 mg·kg Cd pollution. Moreover, correlation was also found in the FDC of organic matter Cd and residual Cd in soil(<0.05) under 5 mg·kg Cd pollution.
开展了土壤培养试验和盆栽试验，以研究纳米沸石（NZ）和普通沸石（OZ）在不同镉污染水平（1、5、10和15 mg·kg）下对土壤pH值、阳离子交换量、土壤镉浓度、土壤镉形态以及小白菜对镉吸收的影响。土壤培养试验结果表明，纳米沸石和普通沸石用量（5、10和20 g·kg）提高了土壤pH值和阳离子交换量，降低了土壤交换性镉浓度，同时提高了镉在碳酸盐、铁锰氧化物、有机质和残渣态中的浓度。在高用量纳米沸石（20 g·kg）处理中，交换性镉含量最低。土壤pH值和阳离子交换量与土壤交换性镉浓度呈极显著负相关（<0.01），与土壤铁锰氧化物镉浓度呈极显著正相关（<0.01）。盆栽试验结果表明，施用沸石后，土壤中交换性镉的固定系数降低了6.4%-63.2%，小白菜中可水溶态和乙醇提取态镉的固定系数分别降低了2.1%-56%和11.8%-100%。此外，纳米沸石对土壤和植物中镉浓度的降低效果优于普通沸石。在镉污染水平为1 mg·kg时，小白菜地上部镉形态的固定系数与土壤中碳酸盐镉和有机质镉的固定系数呈显著相关（<0.05）。在镉污染水平为5 mg·kg时，土壤中有机质镉和残渣态镉的固定系数之间也存在显著相关（<0.05）。
