摘要
以受镉(Cd)污染的棕壤为供试土壤,采用盆栽方法,研究牛粪与秸秆不同配比对土壤Cd形态及作物吸收Cd的影响。结果表明:(1)与对照相比,牛粪与秸秆氮含量比1∶1,3∶1,5∶1的3个处理分别使可交换态Cd含量下降34.39%,28.04%,20.11%,使有机结合态和残渣态Cd含量显著增加。土壤中可交换态Cd含量与pH呈极显著负相关关系,而残渣态Cd含量与pH呈极显著正相关关系。(2)与对照相比,牛粪与秸秆氮含量比1∶1,3∶1,5∶1的3个处理使土壤pH分别提高0.36,0.17,0.16个单位。(3)牛粪与秸秆配施降低了玉米各部位对镉的吸收,并使Cd主要积累在玉米的根、茎、叶部位,降低了籽粒中Cd含量。牛粪与秸秆氮含量比1∶1,3∶1,5∶1的3个处理使籽粒Cd含量浓度分别减少79.64%,72.70%,56.38%。
In this paper,taking a cadmium(Cd)contaminated brown soil as the test soil,the pot experiments were conducted to study the effects of cow manure and straw application on Cd species and Cd uptake by maize.The results showed that:(1)Compared with no cow manure and straw addition,the three treatments with cow manure and straw nitrogen ratios of 1∶1,3∶1 and 5∶1 reduced the exchangeable Cd content by 34.39%,28.04%and 20.11%,respectively.The bound and residual Cd contents increased significantly.The organic-bound Cd and residual Cd extensively increased with the combined application of cow manure and straw.There was a significant negative correlation between the exchangeable Cd contents and soil pH values,and a highly significant positive correlation between residual Cd contents and soil pH.(2)Compared with no cow manure and straw addition,soil pH increased by 0.36,0.17 and 0.16 units,respectively,for nitrogen ratio of cow manure to straw being 1∶1,3∶1 and 5∶1.(3)Compared with no cow manure and straw addition,the Cd uptake by different parts of maize decreased for the combined application of cow manure and straw.The unptaken Cd accumulated mainly in root,stem and leaf of maize,and Cd contents in grain reduced by 79.64%,72.70%and 56.38%for the nitrogen ratio of cow manure to straw being 1∶1,3∶1 and 5∶1,respectively.
作者
陈璐
刘宇斌
党秀丽
丛源欣
吕金朔
张兴
胡艳美
CHEN Lu;LIU Yubin;DANG Xiuli;CONG Yuanxin;LV Jinshuo;ZHANG Xing;HU Yanmei(College of Land and Environment,Shenyang Agricultural University,National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources,Northeast Key Laboratory of Conservation and Improvement of Cultivated Land,Ministry of Agriculture,Shenyang 110866)
出处
《水土保持学报》
CSCD
北大核心
2018年第5期313-317,324,共6页
Journal of Soil and Water Conservation
基金
国家重点研发计划项目(2017YFD0801103-3)；国家自然科学基金项目(41301530)；农业部东北耕地保育重点实验室开放基金项目
关键词
牛粪与秸秆配施
镉
赋存形态
富集系数
combined application of cow manure and straw
Cd
species
bioaccumulation factor
