摘要
采用田间小区试验方法,研究了换种、深耕、施加土壤修复剂、有机肥调控等常见农用地安全利用措施对成都平原镉污染农田的风险管控效果。结果表明:各项措施实施3 d后,除换种和施加蚯蚓粪外,各组土壤pH均较实施前显著升高(p<0.05,下同),除换种、施加蚯蚓粪和施加土壤修复剂外,各组土壤有效态镉含量均较实施前有所下降;单独采取换种措施时,试验所选换种水稻品种糙米镉含量无法达到;单项措施中降镉效果最好的为深耕,其次为施加土壤修复剂,最后为施加生石灰和改性膨润土,单独施加蚯蚓粪反而会导致糙米镉含量显著增加;各种组合措施处理后糙米镉含量均基本能够达标,其中采取组合4(深耕+施加生石灰+施加土壤修复剂+种植"和两优1号")措施后的平均糙米镉含量最低,较对照组糙米镉含量显著降低了95.52%。
Field plot experiment was conducted to investigate the effects of several common safety utilization measures such as substitute plantation, deep ploughing, application of soil remediation agents and organic fertilizers on risk management of cadmium contaminated paddy fields in Chengdu Plain. The results showed that after 3 days of the implementation of various measures, soil pH significantly increased(p<0.05), except treatment applying earthworm cast and substitute plantation;except for treatment of substitute plantation, applying earthworm cast and soil remediation, the bioavailable form of cadmium content of soil generally decreased compared with before implementation;when the substitute plantation treatment was taken separately, the cadmium content of brown rice of rice varieties selected in this experiment could not fully meet the national standard;the best cadmium reduction effect among single measures was deep ploughing, followed by the application of soil remediation agent, quicklime and modified bentonite, while the application of earthworm cast alone significantly increased(p<0.05) the cadmium content of brown rice;after No.4 combined measures(deep ploughing+applying quicklime+application of soil remediation+planting the improved variety Liangyou No.1), the cadmium content of brown rice generally met the national standard, and the average brown rice cadmium content was the lowest among all measures, which was significantly reduced by 95.52%(p<0.05) compared with the control.
作者
刘恒博
雍毅
刘政
姚勤英
黄祥
吴怡
LIU Heng-bo;YONG Yi;LIU Zheng;YAO Qin-ying;HUANG Xiang;WU Yi(Sichuan Academy of Environmental Sciences,Chengdu 610041,China)
出处
《环境工程》
CAS
CSCD
北大核心
2021年第6期167-172,共6页
Environmental Engineering
基金
四川省重点研发项目“同步原位修复多金属复合污染土壤技术研究”(2020YFS0439)
矿区重金属污染土壤修复技术集成与工程应用示范(2018SZ0319)。
关键词
土壤
镉污染
水稻
安全利用
风险管控
soil
cadmium pollution
rice
safety utilization
risk control
