摘要
采用田间采样分析与室内培养试验相结合的方法,研究了不同重金属污染土壤中有机质积累的差异及重金属污染强度对土壤有机质矿化动态变化的影响.结果表明:污染土壤中重金属的大量积累可减弱有机物质的矿化速率,增加土壤有机质的积累.土壤中颗粒态有机质及其占总有机碳的比例随重金属积累的增加而增加;而微生物生物量碳占总碳的比例却随土壤重金属污染水平的提高而下降.污染土壤中颗粒态有机质对重金属有显著的富集,这可能是影响土壤有机物质进一步矿化的原因之一.重金属污染可改变土壤有机质的矿化速率,影响土壤有机质的积累与分配.
By the methods of field sampling and indoor incubation, this paper studied the accumulation and mineralization of soil organic matter under impact of heavy metals pollution. The results showed that high amount of heavy metals in polluted soil could slow down the mineralization rate of soil organic C, and increase the amount of hardly biodegradable organic C. With increasing soil heavy metals pollution, the particulate organic matter and its proportion in total soil organic C increased, while the microbial biomass C and its proportion in total organic C decreased. Heavy metals were largely enriched in particulate organic matter, which could impact the further mineralization of soil organic matter. In a word, soil heave metals pollution could change the mineralization rate of soil organic matter, and affect its accumulation and distribution.
出处
《应用生态学报》
CAS
CSCD
北大核心
2007年第7期1479-1483,共5页
Chinese Journal of Applied Ecology
基金
国家自然科学基金资助项目(40471064).
关键词
重金属污染
有机质积累
颗粒态有机质
矿化
soil heavy metals pollution
organic matter accumulation
particulate organic matter
mineralization.
