期刊论文

中文

环境科学

0250-3301

2023

44

7

4109-4118

10.13227/j.hjkx.202207005

2021NK2027:湖南省重点研发计划项目 2019TJ-N05:湖南省科技人才托举工程项目 CX202102075:中南林业科技大学研究生科技创新基金项目 SKLMHM202209:国家环境保护重金属污染监测重点实验室开放基金项目

本校为第一机构

通过选取湖南省宁乡市某轻度Cd污染稻田开展连续两季水稻秸秆离田田间试验,研究秸秆离田措施对轻度Cd污染稻田土壤Cd有效性及水稻对Cd吸收累积的影响.结果表明:①连续两季秸秆离田有效提高了土壤pH值,降低土壤有机质和根际土壤Cd含量;T1～T4处理使土壤pH值提升0.04～0.58个单位,有机质含量降低了 0.68％～25.87％,根际土壤Cd含量降低了 3.76％～12.78％.②连续两季秸秆离田能降低酸可提取态和可氧化态Cd占比,使残渣态Cd占比上升;同时秸秆离田处理降低了根际土壤Cd的生物有效性,使根际土壤TCLP、DTPA和CaCl2提取态Cd含量均显著降低.③水稻秸秆离田可显著降低土壤孔隙水中DOC和Cd浓度,连续两季秸秆...

A field experiment was conducted in a lightly Cd-contaminated rice field in Ningxiang City, Hunan Province, to study the effects of straw removal measures on the soil Cd bioavailability and rice Cd accumulation. The results showed that:① two consecutive seasons of straw removal measures (T1-T4 treatments) effectively increased soil pH by 0.04-0.58 units, reduced soil organic matter by 0.68%-25.87%, and reduced the Cd content of rhizosphere soil by 3.76%-12.78%. ② The proportions of Cd in the acid-extractable fraction and oxidizable fraction d...