摘要
采用相关性分析、主成分分析和聚类分析等方法,研究伴矿景天种苗质量对土壤镉(Cd)净移除率的影响。结果表明:不同质量种苗对Cd移除效率和修复成本有较大影响,其中茎粗、分枝数、苗高及种苗Cd含量是决定Cd移除效率的重要指标,当种苗茎粗≥5.0 mm,单株分枝数≥2个,苗高≥6.0 cm,种苗含Cd量≤5 mg/kg(即种苗质量达到或高于Ⅱ级)时,种植90 d后Cd净移除量超过200 g/hm^(2),修复效率是Ⅳ级苗(茎粗<4.0 mm,单株分枝数0~1个,苗高<6.0 cm,种苗含Cd量≤5 mg/kg)的3.4倍以上,同时可有效节约人工成本并减少或避免施用除草剂。经大面积修复实例验证发现,采用质量达到或高于Ⅱ级的伴矿景天种苗进行修复,120 d内Cd净移除量可达222.35 g/hm^(2),其修复效果达到或高于前人试验中6~8个月的修复效果。综上所述,本研究评价了种苗质量性状标准,根据此标准筛选出的出圃种苗可显著提高修复效率、降低修复成本,为实现伴矿景天修复过程标准化、机械化提供了依据。
This paper studied the effects of different seedling quality traits of Sedum plumbizincicola on the removal rate of cadmium(Cd). By the methods of correlation analysis, principal component analysis and clustering analysis, it was found that seedling quality had a great impact on Cd removal efficiency and remediation cost, and stem diameter, branch number, seedling height and Cd content were the important indexes to determine the quality of seedlings. The shoot Cd uptake of the Ⅰ or Ⅱ grade seedling with stem diameter≥5.0 mm, branch number per plant≥2, seedling height≥6.0 cm and seedling Cd content≤5 mg/kg, was more than 200 g/hm2after90 d of planting. The remediation efficiencies of the Ⅰ and Ⅱ grade seedlings were over 3.4 times higher than the Ⅳgrade seedling(stem diameter<4.0 mm, branch number per plant of 0-1, seedling height<6.0 cm, seedling Cd content≤5 mg/kg), and using Ⅰ and Ⅱ grade seedlings could effectively save labor cost, and reduce or avoid herbicide application. A case of large-area heavy metal contaminated soil remediation was carried out to test this quality classification standard for S. plumbizincicola seedlings, and it was found that the shoot Cd uptake of the Ⅰor Ⅱ grade seedling was 222.35 g/hm^(2) after 120 d of planting, and the remediation effect could reach or even higher than that of 6-8 months in previous experiments. In summary, the high-quality S. plumbizincicola seedlings is an important basis for improving remediation efficiency and reducing remediation cost. This study clarifies the quality traits and remediation efficiencies of different grades of seedlings. This standard for grading S. plumbizincicola seedlings is helpful to promote the standardization and mechanization of remediating heavy metal contaminated soil with this plant.
作者
戴艳娇
贺爱国
胡志鑫
柏连阳
赵硕
聂阳阳
陈锦
DAI Yanjiao;HE Aiguo;HU Zhixin;BAI Lianyang;ZHAO Shuo;NIE Yangyang;CHEN Jin(Hunan Academy of Agricultural Sciences,Changsha 410125,China;Changsha Technology Innovation Center for Phytoremediation of Heavy Metal Contaminated Soil,Changsha 410125,China;Hunan Airbluer Environmental Protection Technology Co.,Ltd.,Changsha 410071,China)
出处
《浙江大学学报（农业与生命科学版）》
CAS
CSCD
北大核心
2022年第4期473-482,共10页
Journal of Zhejiang University:Agriculture and Life Sciences
基金
长沙市科技计划项目(kq1907054)
长沙市科技重大专项(kq2006026)
国家重点研发计划项目(2017YFD0801504)。
关键词
植物修复
伴矿景天
种苗质量
镉净移除量
修复效率
修复成本
phytoremediation
Sedum plumbizincicola
seedling quality
Cd uptake
remediation efficiency
remediation cost
