Clemente Rafael, Escolar Angeles, Bernal M Pilar
Department of Soil and Water Conservation and Organic Waste Management, Centro de Edafología y Biología Aplicada del Segura, CSIC, Espinardo, Murcia, Spain.
Bioresour Technol. 2006 Oct;97(15):1894-901. doi: 10.1016/j.biortech.2005.08.018. Epub 2005 Oct 11.
Degradation of organic matter (OM) from organic amendments used in the remediation of metal contaminated soils leads to changes in soil chemical properties shortly after their addition, which may affect the soil metal distribution. The effects of two differing organic amendments on OM mineralisation and fractionation of heavy metals in a contaminated soil were investigated in an incubation experiment. The treatments were: control unamended soil, soil amended with fresh cow manure, and soil amended with a compost having a high maturity degree. The soil used was characteristic of the mining area at La Unión (Murcia, Spain) with 28% CaCO(3) and sandy-loam texture (pH 7.7; 2602 mg kg(-1)Zn; 1572 mg kg(-1)Pb). Manure and compost C-mineralisation after 56 days (24% and 3.8%, respectively) were below values reported previously for uncontaminated soils. Both amendments favoured Zn and Pb fixation, particularly the manure. Mn solubility increased at the beginning of the experiment due to a pH effect, and only Cu solubility increased through organic matter chelation in both amended soils.
用于修复金属污染土壤的有机改良剂中的有机物（OM）降解会导致其添加后不久土壤化学性质发生变化，这可能会影响土壤金属分布。通过一项培养实验研究了两种不同有机改良剂对污染土壤中OM矿化和重金属分馏的影响。处理方式包括：未改良的对照土壤、添加新鲜牛粪的土壤以及添加高成熟度堆肥的土壤。所用土壤具有西班牙穆尔西亚自治区拉乌尼翁矿区的特征，含有28%的碳酸钙，质地为砂壤土（pH值7.7；锌含量2602毫克/千克；铅含量1572毫克/千克）。56天后，牛粪和堆肥的碳矿化率（分别为24%和3.8%）低于先前报道的未污染土壤的值。两种改良剂都有利于锌和铅的固定，尤其是牛粪。由于pH效应，实验开始时锰的溶解度增加，并且在两种改良土壤中，只有铜的溶解度通过有机物质螯合而增加。
