期施用有机肥对棕壤中主要重金属积累的影响

以沈阳农业大学棕壤长期定位试验地为研究对象,分别选取不同年限CK、M_2、M4、N_4P_2、M_4+N_4P_2等10个处理的0～20 cm土壤,测定土壤中Cu、Zn、Pb和Cd等重金属的含量.结果表明:随着年限的增长,土壤中Cu、Zn、Pb和Cd的含量均呈现增加的趋势,以施用有机肥M4和Mz及有机肥化肥配施M_4+N_4P_2对土壤中重金属Cu、Zn、Pb和Cd含量影响最为明显,而在无肥对照CK和单施化肥N_4P_2处理下四种元素均有少量增加;几种重金属元素增长的相对大小为:Cd>Cu>Zn>Pb,其中目前Cu含量还未达到国家二级环境质量标准,Cd含量超标应引起足够重视.几种元素的相关分析表明,Cu、Zn之间具有极显著相关性,表明它们的来源具有一定的相关性. u、zn、Pb和Cd等重金属的含量.结果表明:随着年限的增长,土壤中Cu、Zn、Pb和Cd的含量均呈现增加的趋势,以施用有机肥M4和Mz及有机肥化肥配施M_4+N_4P_2对土壤中重金属Cu、Zn、Pb和Cd含量影响最为明显,而在无肥对照CK和单施化肥N_4P_2处理下四种元素均有少量增加;几种重金属元素增长的相对大小为:Cd>Cu>Zn>Pb,其中 前Cu含量还未达到国家二级环境质量标准,Cd含量超标应引起足够重视.几种元素的相关分析表明,

Effects of Long-Term Application of Organic Manure on Accumulation of Main Heavy Metals in Brown Earthl

The contents of soil heavy metals(Cu, Zn, Pb and Cd) in the treatments with application of pig manure and inorganic fertilizers were determined in the long-term brown earth field located experimental station, Shenyang Agricultural University, in order to make sure the accumulation of heavy metals in soil under these manure and inorganic fertilizer applied patterns(CK, M_2, M_4, N_4P_2, M_4N_4P_2). The results obtained from experiment showed that the contents of Cu, Zn, Pb and Cd increased with years, especially in the manure applied treatments(M_4, M_2 and M_4N_4P_2). The accumulated degrees(%) of the four heavy metals were as the follows: Cd> Cu> Zn> Pb. According to the National Environmental Quality Standard for soils, the content of Cu was less than the second grade of this standard, but the Cd contents exceeded, which should be paid great attention. The correlation analysis on those elements showed that Cu and Zn had a very significant correlation, indicating that they came from similar sources.