Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
Environ Geochem Health. 2012 Aug;34(4):481-92. doi: 10.1007/s10653-011-9442-y. Epub 2011 Dec 22.
A glasshouse pot experiment was conducted to investigate Cd concentrations in the aboveground parts of two consecutive crops of rice and Cd availability in three different soils (loam, silt loam, and sandy loam) after application of pig manure with added Cd. Soil pH tended to increase with increasing application rate of pig manure from 1 to 3% (w/w, oven dry basis). Soil diethylene triamine pentaacetic acid (DTPA) extractable Cd showed a clear positive correlation with soil total Cd content and increased with increasing Cd amendment of the manure but showed no difference between the two manure application rates. Cd concentrations in the grain, husk, and straw were significantly and positively correlated with soil DTPA-extractable Cd (p < 0.001). Within each level of manure Cd, the higher rate (3%) of manure produced lower Cd concentrations in the grain, husk, and straw on all three soils than did the lower rate (1%) after the first crop, but this no longer occurred after the growth of the second crop. Grain Cd concentrations exceeded the Chinese National Food Quality Standard (0.2 mg kg(-1)) most often on the loam, with intermediate frequency on the silt loam, and least often on the sandy loam, the soil with the highest pH and lowest organic carbon content and cation exchange capacity.
采用温室盆栽试验研究了施用添加 Cd 的猪粪后，地上部两季水稻中的 Cd 浓度和 3 种不同土壤（壤土、粉壤土和砂壤土）中 Cd 的有效性。随着猪粪施用量从 1%增加到 3%（w/w，干基），土壤 pH 值呈上升趋势。土壤二乙烯三胺五乙酸（DTPA）可提取 Cd 与土壤总 Cd 含量呈明显正相关，且随着粪肥中 Cd 含量的增加而增加，但在两种粪肥施用量之间没有差异。稻谷、稻壳和秸秆中的 Cd 浓度与土壤 DTPA 可提取 Cd 呈显著正相关（p < 0.001）。在粪肥 Cd 的每个水平内，在所有 3 种土壤上，高施用量（3%）的粪肥比低施用量（1%）在第一季作物后产生的稻谷、稻壳和秸秆中的 Cd 浓度更低，但第二季作物生长后这种情况不再发生。稻谷中的 Cd 浓度最常在壤土上超过中国国家食品质量标准（0.2mgkg(-1))，在粉壤土上中等频率，在 pH 值最高、有机碳含量和阳离子交换量最低的砂壤土上最低。
