Lu Huanping, Li Zhian, Fu Shenglei, Méndez Ana, Gascó Gabriel, Paz-Ferreiro Jorge
Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China; University of Chinese Academy of Sciences, Beijing, China.
Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China.
PLoS One. 2014 Apr 16;9(4):e95218. doi: 10.1371/journal.pone.0095218. eCollection 2014.
Phytoremediation of soils contaminated with cadmium was tested after liming (CaO) or biochar addition, using red amaranth (Amaranthus tricolor L.) as test plant species. Two biochars with contrasting characteristics were prepared from two feedstocks and added to the soil at a rate of 3% (w:w): Eucalyptus pyrolysed at 600°C (EB) and poultry litter at 400°C (PLB). Liming was carried out in two treatments (CaO1) and (CaO2) to the same pH as the treatments EB and PLB respectively. Total plant mass increased in soils amended with PLB and with a mixture of PLB and EB; however this was not sufficient to increase the efficiency of phytoextraction. Bioavailable and mobile fractions of Cd diminished after liming or biochar addition. Our study infers that, both the amount of Cd immobilized and the main mechanism responsible for this immobilization varies according to biochar properties.
以红苋菜（Amaranthus tricolor L.）作为受试植物，研究了在施加石灰（CaO）或添加生物炭后，对镉污染土壤进行植物修复的效果。由两种原料制备了两种特性不同的生物炭，并以3%（w:w）的比例添加到土壤中：600°C热解的桉树（EB）和400°C的家禽粪便（PLB）。分别进行了两种石灰处理（CaO1）和（CaO2），使其pH值分别与处理EB和PLB相同。添加PLB以及PLB与EB的混合物后，土壤中植物总质量增加；然而，这并不足以提高植物提取效率。施加石灰或添加生物炭后，镉的生物有效性和可移动部分减少。我们的研究推断，固定的镉量以及造成这种固定的主要机制均因生物炭性质而异。
