摘要
还田消纳是猪场沼液资源化利用的主要方式。由于沼液中含有多种金属元素,过量浇灌会引发土壤重金属污染。目前,关于猪场沼液对耕地土壤和植物重金属污染特征的影响及其影响因子的研究还不够深入。在广西生猪养殖区,选取了4种不同耕地利用类型(叶菜类、果树类、饲草类、药草类)和14个样地,就不同沼液浇灌强度对土壤与植物重金属的影响规律及其影响因子进行研究。结果表明:在14个样地0~40 cm表层土壤中,重金属Cu、Zn、Cd的输入强度最大,且其含量和土壤pH变化和与沼液浇灌总量呈显著(p<0.05)正相关;在4种耕地类型中,杂交象草和空心菜的可食用部分Cu、Zn、Cd、Pb、Cr含量与沼液浇灌总量呈显著正相关;在沼液还田中,由于Cu、Zn的输入强度大,而植物对其的富集系数又较低,因此土壤中Cu、Zn积累较快;浇灌沼液对叶菜类和果树类的主要污染风险是Pb和Cd,而对杂交象草的污染风险较小。
Returning biogas slurry to farms is the primary method of resource utilization.Due to the presence of various metal elements in biogas slurry,excessive irrigation will cause heavy metal pollution in the soil.At present,in-depth research on the effects of biogas slurry from pig farms on the heavy metal pollution characteristics of cultivated soil and plants and their influencing factors is lacking.In this paper,in Guangxi pig breeding areas,four different types of cultivated land(leafy vegetables,fruit trees,forage grasses,and herbs)and 14 sample plots were selected to study the influence of various irrigation intensities on heavy metals in soil and plants.The results showed that the input intensities of the heavy metals Cu,Zn,and Cd were highest in the 0 to 40 cm surface soils of 14 plots,and their contents and changes in the soil pH were significantly posi-tively correlated with the total amount of biogas slurry irrigation(p<0.05).Among the four types of cultivated land,the con-tents of Cu,Zn,Cd,Pb,and Cr in the edible parts of hybrid elephant grass and water cabbage were significantly positively correlated with the total amount of biogas slurry irrigation.In the process of returning biogas slurry to the field,due to the high input intensity of Cu and Zn and the low enrichment coefficient of plants,the accumulation of Cu and Zn in the soil is faster.The main pollution risks of irrigating biogas slurry on leafy vegetables and fruit trees are Pb and Cd,while the pollution risk to hybrid elephant grass is relatively low.
作者
徐晓楠
王一佩
杨钙仁
刘炳妤
邓羽松
黄钰涵
XU Xiaonan;WANG Yipei;YANG Gairen;LIU Bingyu;DENG Yusong;HUANG Yuhan(College of Forestry,Guangxi University,Nanning,Guangxi 530004,China;Science and Technology Innovation and Development Center,Chinese Academy of Sciences,Beijing 100190,China;Guangxi Key Laboratory of Forest Ecology and Conservation,Nanning,Guangxi 530004,China)
出处
《热带农业科学》
2024年第2期64-72,共9页
Chinese Journal of Tropical Agriculture
基金
广西重点研发计划项目(No.桂科AB22080103)
广西创新驱动发展项目(No.桂科AA17204078-3,No.桂科AA17204087-8)。
关键词
猪场沼液还田
土壤
植物
重金属含量
returning biogas slurry from pig farms to the field
soil
plants
heavy metal content
