摘要
在水稻土和赤红壤中分别以2%和4%(w/w)比例施入含As、Cu和Zn的鸡粪和猪粪,以不施肥为对照进行苋菜盆栽试验,研究施入粪肥对土壤As、Cu和Zn有效性的影响。结果表明,与对照相比,施用粪肥均提高苋菜生物量,但几乎均显著降低苋菜As、Cu和Zn含量。试验前,赤红壤As、Cu和Zn总含量及有效含量明显低于水稻土,但赤红壤中施用粪肥处理的苋菜As、Cu和Zn含量及As和Zn吸收量均极显著高于水稻土的。苋菜收获后,各处理的土壤As总含量和有效含量均较试验前下降,施用高量鸡粪和猪粪处理的土壤总Cu、总Zn及有效Cu、有效Zn均出现累积。与对照比较,施用粪肥提高了土壤As、Cu和Zn的总含量、有效含量及有效含量占各自总量的百分数。如以土壤重金属有效含量增量及有效百分数增加来衡量粪肥提高土壤重金属有效性作用大小,则鸡粪提高土壤As有效性的作用较猪粪大,但其提高Cu、Zn有效性的作用不如猪粪,且高量粪肥处理较低量处理作用明显,粪肥在赤红壤中提高As、Cu和Zn有效性的作用大于在水稻土中。
Since organoarsenicals, copper and zinc additives are widely used in modern intensive animal production, animal manures are commonly high in As, Cu and Zn content. A pot experiment with amaranth was conducted to investigate As, Cu and Zn bioavailability in a paddy soil （PS） and a lateritic red soil （LRS） applied with 2% and 4% （w/w） chicken manure （CM） and pig manure （PM） , respectively. Soils without any fertilizer were included as the checks （CK）. Results show that application of the two manures increased hiomass of the shoots of amaranth, but decreased its As, Ca and Zn content. Variation of the contents of As, Cu and Zn and uptake rates of three elements in amaranth among treatments with manures didn＇ t show any distinct rule two soils. However, though the initial contents of total and available As, Cu and Zn were much lower in LRS than in PD, As, Cu and Zn contents and As, Zn uptake rates of amaranth were significantly higher in LRS than in PD at the level of 0.01, with the exception that significant difference wasn＇ t observed in Cu uptake rates between two soils. Soil total and available As in all treatments reduced after the harvest of amaranth, but soil total and available Cu and Zn increased in treatments applied with higher rates of two manures as compared to their initial values. And, soil total and available As, Cu and Zn and percent available As, Cu and Zn over total As, Cu and Zn increased by the application of manures compared to CK. It was assumed that the bioavailability of heavy metals be measured by the increments of available content and percent available content over total content, availability of soil As was enhanced by CM than by PM, but that of soil Cu and Zn was increased by PM than by CM. The availability of soil As, Cu and Zn was higher in treatments with higher manure rates than those with lower ones, and higher in LRS than in PS.
出处
《土壤学报》
CAS
CSCD
北大核心
2009年第1期127-135,共9页
Acta Pedologica Sinica
基金
广东省自然科学基金项目(06025382)
广东省科技攻关项目(2005B20801008)
广东省农科院科技攻关项目(2004-攻关-20B)
关键词
鸡粪
猪粪
砷
铜
锌
植物有效性
Chicken manure
Pig manure
Arsenic
Copper
Zinc
Phytoavailabillty
