摘要
为了能给污泥资源开发利用开辟新的途径，以黄土为供试土壤，小麦（Triticumaestivum L.）为供试作物。采用盆栽试验研究了泥在不同Cd胁迫黄土中对小麦生长的影响及其对小麦各部位Cd的富集迁移规律。试验设计2个污泥处理水平，每个塑料盆中加入8.0 kg供试土壤或污泥含量为4.0%的供试土壤，土壤中以Cd（NO3）2·4H2O溶液形式加入的Cd质量分数分别为0.5、1.0、2.5、5.0、10.0、25.0、50 mg·kg^-1，对应各处理为TS1-TS7。各胁迫水平均设置3个平行，同时设置对照TS0。结果表明，黄土中低水平的Cd胁迫可促进小麦的生长，且在Cd污染水平5.0 mg·kg^-1时施污泥和未施污泥土壤中小麦生物量均最大，而高水平的Cd胁迫抑制小麦的生长，且Cd胁迫水平越高，抑制作用越强烈；Cd胁迫下施用污泥可促进小麦的生长，尤其是茎叶和籽粒的生长；小麦各部位Cd的含量随土壤Cd处理水平的升高而增加且呈显著正相关（P＜0.05），各部位最大浓度分别可以达到：45.32、14.41、9.66 mg·kg^-1，且根系＞茎叶＞籽粒，污泥的施用能促进小麦对Cd的吸收；小麦各部位对Cd的富集能力均随着土壤Cd胁迫水平的升高而先增加后减小，污泥的施用在一定程度上提高了小麦对Cd的富集能力，各部位富集系数最大分值分别为1.81、0.93、0.51，但对Cd进入小麦根系后向茎叶和籽粒的迁移影响不显著。
In order to develop new approaches to utilization of sewage sludge, a pot experiment was conducted out for loess and wheat to study the effects of application of municipal sewage sludge on growth of wheat and accumulation and migration of cadmium under stress. There are two sludge treatment levels in the experimental and 8.0 kg test soil or amended with 4.0%sludge were added in each plastic pots. The solution of Cd （NO3）2·4H2O was added in soils with concentration of 0.5, 1.0, 2.5, 5.0, 10.0, 25.0, 50 mg·kg^-1, corresponding to each treatment for TS1-TS7. Various stress levels were set up three parallel, and set the control TS0.The results indicated that low stress levels of cadmium in loess can promote the growth of wheat, and biomass of wheat in both soils reached maximum in stress levels of 5.0 mg·kg^-1. However, high stress levels of cadmium inhibits the growth of wheat and inhibition promoted with increase of the stress levels. The application of municipal sewage sludge under cadmium stress can promote the growth of wheat, especially is the shoots and seeds;The content of cadmium of various parts of wheat increased with the increase of stress levels and this phenomenon was a significant positive correlation （P 〈0.05）, and the maximum content of cadmium of various parts of wheat were the roots （45.32 mg·kg^-1）, followed by the shoots （14.41 mg·kg^-1）, the minimum is seed （9.66 mg·kg^-1）. The application of sludge can promote the absorption of cadmium in wheat; The accumulation capability of various parts of the wheat first increase and then decrease with increase of stress levels of cadmium. The application of municipal sewage sludge can improve the accumulation ability of cadmium in wheat and the maximum enrichment factor of the various parts of wheat were 1.81, 0.93, 0.51, but the impact on the migration of cadmium which shift from the roots to shoots and seed were not significant.
出处
《生态环境学报》
CSCD
北大核心
2014年第8期1366-1371,共6页
Ecology and Environmental Sciences
基金
国家自然科学基金项目(NSFC 51178209
NSFC 91025015)
兰州大学中央高校基本科研业务费专项资金项目(lzujbky-2014-279
lzujbky-2014-208)
关键词
小麦
污泥
CD
富集
迁移
wheat municipal sludge
Cd
accumulation
translocation
