摘要
通过室内模拟培养的方法研究了草炭和钙镁磷肥两种调控剂对土壤镉形态的影响。结果显示,在镉为3.0mg/kg的酸性土壤中,钙镁磷肥对土壤有效镉的钝化调控优于草炭,就对土壤有效镉含量降低的最大量而言,钙镁磷肥和草炭分别为0.36mg/kg和0.25mg/kg。钙镁磷肥和草炭总体上均能降低碱性土壤有效镉含量,而土壤有效镉的动态变化规律因镉污染程度不同而异。不论土壤呈酸性还是碱性,随草炭添加量的增加,土壤镉的有效态、无机结合态和残留态均降低,其最大降低比例分别为8.1%、26.4%和5.9%,而有机结合态增加,最大可达37.9%。随钙镁磷肥添加量增加,土壤镉的有效态和无机结合态均降低,最大比例分别为9.5%和43.5%,残留态显著增加,最大比例达44.1%,有机结合态变化则不明显。
The effects of two regulating agents on Cadmium （Cd） fractions in contaminated soils were studied mrougn laboratory incubating experiment,where calcium magnesium phosphate fertilizer （CMPF） and peat were added into test soils, respectively. The results showed that the effects of CMPF on soil available Cd were all superior to that of peat in the acid soil with the Cd concentration of 3.0 mg/kg. When CMPF and peat were added into the acid soil with the Cd concentration of 3.0 mg/kg, the decreasing maximum of available Cd concentrations were 0. 36 mg/kg and 0.25 mg/kg, respectively. The concentrations of available Cd in the alkaline soils decreased on the whole during the incubating period after added into various dosages of CMPF or peat,respectively. However, the dynamic changes of available Cd in alkaline soils varied due to different soil contamination degrees. With increasing application of peat into both acidic soil and alkaline soil, the percentages of available,inorganic-bound and residual Cd decreased by 8. 1%, 26.4% and 5.9% by the greatest extent, respectively, while the percentage of organic-bound Cd increased to 37.9%. With increasing application of CMPF, the percentages of available and inorganic-bound Cd decreased by 9.5 % and 43.5% by the greatest extent, respectively, the percentage of residual Cd increased by 44. 1% ,while the percentage of organic-bound Cd changed insignificantly.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2013年第11期132-137,共6页
Journal of Wuhan University of Technology
基金
武汉理工大学国家级大学生创新创业训练计划(20121049708004)
中央高校基本科研业务费专项资金(2011-Ⅳ-015)
关键词
镉污染土壤
调控剂
镉形态
草炭
钙镁磷肥
soil contaminated by cadmium
regulating agent
CA factions
peat
calcium magnesium phosphate
