Antoniadis V, Alloway B J
Department of Soil Science, The University of Reading, UK.
Environ Pollut. 2002;117(3):515-21. doi: 10.1016/s0269-7491(01)00172-5.
A pot experiment was conducted to investigate the effect of application of naturally derived dissolved organic compounds (DOC) on the uptake of Cd, Ni and Zn by Lolium perenne L. from mixtures of soil and sewage sludge and on their extractability with CaCl2. DOC was applied at concentrations of 0, 285 and 470 mg l(-1) to a loamy sand (LS) and a sandy clay loam (SCL) soil mixed with sewage sludge at rates equivalent to 0, 10 and 50 t ha(-1). DOC applications significantly increased the extractability of metals and also their uptake by ryegrass, but the increase was greater where sludge was applied at 50 t ha(-1). It is suggested that DOC in soils significantly increased the availability of the metals to plants. This was especially the case in the LS soil, where DOC had less competition with surface sorption than in the SCL soil.
进行了一项盆栽试验，以研究施用天然来源的溶解性有机化合物（DOC）对黑麦草从土壤与污水污泥混合物中吸收镉、镍和锌的影响，以及对它们用氯化钙提取的能力的影响。将DOC以0、285和470 mg l(-1)的浓度施用于与污水污泥混合的壤质砂土（LS）和砂质粘壤土（SCL）土壤，施用量分别相当于0、10和50 t ha(-1)。施用DOC显著提高了金属的提取率及其在黑麦草中的吸收量，但在污泥施用量为50 t ha(-1)的情况下增加幅度更大。研究表明，土壤中的DOC显著提高了金属对植物的有效性。在LS土壤中尤其如此，与SCL土壤相比，DOC在LS土壤中与表面吸附的竞争较小。
