农业环境科学学报2011，Vol.30Issue(11)：2178-2184,7.
有机物料及其用量对生菜生长与Pb含量的影响
Effect of Organic Materials on the Growth and Pb Concentration of Lactuca sativa
摘要
Abstract
There is increasing concern about vegetable safety and environmental heavy metal pollution in the rapidly developing suburb in China, especially in the Pearl River Delta Region, South China. The bioavailability of heavy metals can decrease due to their immobilization by adsorption or binding to organic matter with high molecule weight in soils. Therefore, addition of organic materials to soils may reduce the uptake of heavy metals by crops. Three continuous rounds of pot experiment were conducted to investigated the effect of five organic materials (manure, pig shit, cattle shit, hen shit, earthnut residue, and their application of 0.5%, 1%, 2%, 4% per kg soil, respectively) on the growth and Pb concentrations of lettuce(Lactuca saliva). The results showed that compared with the control, organic materials were beneficial for the growth of lettuce and increased the fresh biomass of lettuce; The growth response of lettuce growing in the soil to five organic material wasn't unanimous, which were in the order of hen shit >earthnut residue >pig shit>cattle shit>manure. Most of treatments affected insignificandy aboveground Pb concentration of lettuce in comparison with CK. Among 5 organic materials, only cattle shit had a trend to increase the Pb uptake of lettuce. The aboveground Pb concentration mean values of 5 organic materials for 3 crops lettuce were different ( cattle shit>hen shit>earthnut residue>manure>pig shit), but there was not markedly difference among them. The effect of 5 organic materials on soil pH was different. There was a significantly negative relationship between treatment dose of manure (or earthnut residue) and soil pH( Pearson correlation: -0.820 、-0.917, N=20, P<0.01): There was insignificant relationship between that of hen shit and soil pH; But there was markedly positive relationship between that of pig shit(or cattle shit) and soil pH(0.862, 0.775, N=20, P<0.01 ). DTPA-Pb was significantly negatively related to soil pH, but it was insignificantly related to aboveground Pb concentration. Compared with CK, most of treatments did not affect significantly soil DTPA-Pb concentration, so the preliminary reason is disclosed why the tested organic materials did not affect remarkably aboveground Pb concentration of L. Saliva.关键词
土壤/生菜/重金属/污染Key words
soil/ Lactuca saliva/ heavy metal/ pollution分类
农业科技引用本文复制引用
唐明灯,艾绍英,李盟军,罗英健,姚建武,王艳红,曾招兵,余丹妮..有机物料及其用量对生菜生长与Pb含量的影响[J].农业环境科学学报,2011,30(11):2178-2184,7.基金项目
广东省科技厅重大专项(2007A032303001,2008A030202002) （2007A032303001,2008A030202002）
广东省农业领域重点专项项目(2009A0201005) （2009A0201005）
广东省农业攻关(2008B021000038)资助 （2008B021000038）
