不同钝化剂配施硫酸锌对石灰性土壤中镉生物有效性的影响研究.pdf

农业环境科学学报2012,31(2):312-317
Journal of Agro-environment Science
不同钝化剂配施硫酸锌对石灰性士壤中
镉生物有效性的影响研究
丁琼12,杨俊兴2,华珞,左余宝2,马义兵2
(1.首都师范大学资源环境与旅游学院资源环境与地理信息系统北京市重点实验室,北京100048;2.中国农业科学院农业资源与
农业区划研究所农业部作物营养与施肥重点实验室,北京100081)
摘要:为了降低轻度镉(Cd)污染土壊中Cd的生物有效性以确保农产品安全,以低吸收豆类荒菜(豇豆)作为供试植物,通过田间
试验研究了在轻度Cd污染(Cd1.5mg“kg)石灰性土壤中施加赤泥、油菜秸秆、玉米秸秆、赤泥+油菜秸秆等钝化处理并配施硫酸
锌肥料对土壤中Cd的生物有效性的影响。结果表明,与对照相比,不同钝化处理可显著(P0.05)降低豇豆豆角中Cd浓度和土壤中
可溶态Cd浓度;钝化处理条件下豇豆豆角中Cd浓度降低了27%(玉米秸秆)-83%(赤泥+油菜秸秆)。在施加钝化剂的基础上,配
施硫酸锌肥料可进一步降低豇豆对Cd的吸收,各钝化处理在配施锌肥后,豇豆豆角中Cd平均浓度与未施锌肥相比降低了27%。
对不同作物秸秆而言,富含巯基的油菜秸秆比富含纤维素的玉米秸秆钝化效果好。由此可见,在轻度Cd污染的石灰性士壤中,无
机饨化剂赤泥和富含巯基的油菜秸秆复合使用是一种高效且环境友好的钝化手段。同时,合理施用锌肥可能会进一步降低作物对
Cd的吸收。
关键词:镉;石灰性土壤;豇豆;钝化剂;修复
中图分类号:X53文献标志码:A文章编号:1672-2043(2012)02-0312-06
Cadmium Phytoavailability to Cowpea Decreased by Rape Straw and Red Mud with Zinc Sulphate in a Cal-
careous Soil
DING Qiong, YANG Jun-xing, HUA Luo, ZUO Yu-bao, MA Yi-bing?
(1. The Key Lab of Resource Environment and GIS, the College of Resource Environment and Tourism, Capital Normal University, Beijing
100048, China; 2. The Key Iab of Crop Nutrition and Fertilization of Ministry of Agr culture, Institute of Agricultural Resources and Regional
Planning Chinese Academy of Agricultural Sciences, Beijing 100081, China)
Abstract: To reduce Cd phytoavailability in alcaeus i, the ffes of soil amendments of red mud, rape straw, com straw and red mud
plus rape straw in combination with zn feiizaion on d extractability and ph t vailability to cowpea were investigated in a calcareous
soil with added Cd at 1. 5 mg kg. The results showed that water soluble and exchangeable Cd in soils was significantly decreased by the a
mendment, which resulted in significant decrease by about 7%(om straw) 83%(red mud plus rape straw)in Cd
concentration In cowpea
Combined with amendmen s, Zn fertilization further decreased the Cd concentration in cowpea. Compared with amendments only, the con-
centrations of d in the edible parts of cowpea treated with the Zn fertilization plus amendments decreased by 27% on average. Also crucifer-
ous rape straw was more effective than gramineous com straw. In all reatments, rape straw plus red mud combined with Zn fertilization was
most effective in decreasing d phytoavailability t wpea in sils, and it s po al o be an efficient, cost-effective and environmen ally
friendly measure to ensure food safety for crop production in mildly Cd-contaminated and calcareous soils
Keywords: cadmium; calcareous soil; cowpea; amendments; remediation
收稿日期:2011-07-10
基金项目:公益性行业(农业)科研专项(20090315)
作者简介:丁琼(1986-),女,北京通州人,硕土研究生,主要从事土壤环境化学研究。E- mail: qiang_forever(@126.cm
通讯作者:马义兵E-mail:ybma@eas.ac.cn
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