摘要
探明两种调理剂对近中性水稻土pH值、重金属有效性和水稻吸收的影响,及其与土壤性质的关系,为调理剂的科学开发及合理施用提供科学依据。选取水淬高炉渣源调理剂(T1)及其腐殖质改性调理剂(T2),分别设置2个施用量梯度(T1L、T1H和T2L、T2H),通过盆栽试验分析了两种调理剂及不同用量对土壤pH值、有效硅、镉、锌、铜含量,以及水稻籽粒和秸秆镉、锌、铜含量的影响。与对照(CK)相比,2个施用T1调理剂处理土壤pH值分别升高0.64和1.02,2个施用T2调理剂处理pH值分别升高0.27和0.56(P<0.05),土壤pH值随调理剂施用量的增加而增加。T1L和T1H处理土壤有效硅含量与CK相比分别提高5和22倍(P<0.05),且显著高于施用T2调理剂处理。与CK相比,T1H处理土壤有效镉、锌、铜含量分别降低37.21%、45.57%和95.30%(P<0.05);T2L和T2H处理土壤有效锌含量分别降低31.55%和30.67%,有效铜含量分别降低6.53%和19.32%(P<0.05)。与CK相比,T1L和T1H水稻籽粒锌含量分别降低23.44%和18.12%(P<0.05);施用T2调理剂后,籽粒和秸秆锌、铜含量无显著变化。土壤pH值、有效硅含量与土壤有效镉、锌、铜含量呈显著或极显著负相关,土壤有效硅含量与籽粒、秸秆镉含量呈显著负相关。研究表明,在近中性水稻土上施用富含硅的强碱性调理剂,既有利于提高土壤p H值和有效硅含量,又可有效降低土壤重金属有效性及其水稻吸收量。
Steel slag have the potential to ameliorate heavy metal contaminated soils,but their effectiveness and the mechanisms involved are not fully understood.The effects of amendments on soil pH value,heavy metal availability and rice absorption of paddy soil and their relationship with soil properties were explored to provide scientific basis for the development and application of amendments.A pot experiment was conducted on a paddy soil amended with two amendments(T1 and T2)derived from steel slag at two levels(T1L,T1H;T2L,T2H).Soil pH value,available silicon,available heavy metals,and heavy metals(cadmium,zinc,copper)uptake by rice as well as their relationships were determined.Compared with CK treatment,soil pH value of T1L and T1H were significantly increased by 0.64 and 1.02,while soil pH value of T2L and T2H treatments significantly were increased by 0.27 and 0.56,respectively(P<0.05).The soil available silicon content in T1L and T1H treatments significantly were increased by 5 and 22 times,respectively(P<0.05),which was higher than that in T2 amendments.Compared with CK treatment,the available cadmium,zinc and copper contents in T1H treatment significantly were decreased by 37.21%,45.57%and 95.30%,respectively(P<0.05).The soil available zinc contents in T2L and T2H treatments significantly were decreased by 31.55%and 30.67%,while the soil available copper contents were decreased by 6.53%and 19.32%(P<0.05),respectively.Compared with CK treatment,the zinc contents of rice grain in T1L and T1H treatments significantly were decreased by 23.44%and 18.12%,respectively(P<0.05).The zinc and copper contents of rice grain and straw had no significant differences after adding T2 conditioner.The concentrations of soil available cadmium,zinc and copper were negative correlation with soil pH value and concentration of soil available silicon;while the contents of cadmium in grain and straw were negative correlation with soil available silicon.The data indicated that the amendment with high pH and silicon content could effectively increase soil pH value and available silicon content,and reduce availability of heavy metals and uptakes by rice in such paddy soil.
作者
张璐
文石林
上官方钦
秦松
张会民
ZHANG Lu;WEN Shi-lin;SHANGGUAN Fang-qin;QIN Song;ZHANG Hui-min(Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences/State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China,Beijing 100081;Hengyang Red Soil Experimental Station of Chinese Academy of Agricultural Sciences/Qiyang Farmland Ecosystem National Observation and Research Station,Qiyang Hunan 426182;Central Iron&Steel Research Institute,Beijing 100081)
出处
《中国土壤与肥料》
CAS
CSCD
北大核心
2024年第1期79-85,共7页
Soil and Fertilizer Sciences in China
基金
科技基础资源调查专项(2021FY100504)
中央级公益性科研院所基本科研业务专项(1610132020024)。
关键词
调理剂
水稻土
PH值
有效硅
重金属
conditioner
paddy soil
pH value
available silicon
heavy metals
