Innovation Team of Remediation for Heavy Metal Contaminated Farmlands, Agro-Environmental Protection Institute, Ministry of Agriculture, No. 31, Fukang Road, Nankai District, Tianjin, 300191, People's Republic of China.
Key Laboratory of Original Environmental Pollution Control, Ministry of Agriculture/Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, No. 31, Fukang Road, Nankai District, Tianjin, People's Republic of China.
Environ Sci Pollut Res Int. 2019 Oct;26(30):30847-30856. doi: 10.1007/s11356-019-06271-y. Epub 2019 Aug 24.
Widespread contamination of agricultural soil with Cd and As has resulted in substantial transfer and accumulation of these toxicants in rice grains. In the present study, we investigated the effects of chicken manure application on Cd and As concentrations and As speciation in the rice grains grown under different water conditions by pot experiment. Under aerobic condition, the application of chicken manure increased soil pH and soil Eh during most of the growth period of rice. Consequently, the application of chicken manure has little effect on total Cd, slightly decreased total As and inorganic As of rice grains when applied at rate of 2.0%. Under intermittent irrigation condition, the application of chicken manure increased soil pH and decreased soil Eh during most of the growth period of rice. Thus, chicken manure decreased total Cd, As, and inorganic As of rice grains. Besides, there was increased reduction of Cd and As with increase in the amount of chicken manure applied. Under flooded condition, the application of chicken manure increased soil pH before heading but decreased soil pH after heading. The application of chicken manure dramatically decreased total and inorganic As in rice grains, and slightly decreased Cd of rice grains. There was increased reduction of total As concentration with the increase in the amount of chicken manure applied. Meanwhile, the inorganic As concentration was the lowest when the concentration of chicken manure was 1.0%.
农田土壤中 Cd 和 As 的广泛污染导致这些有毒物质在稻米中大量转移和积累。本研究采用盆栽试验，研究了鸡粪施用量对不同水分条件下水稻糙米中 Cd 和 As 浓度及 As 形态的影响。在好气条件下，鸡粪的施用在水稻生长的大部分时期增加了土壤 pH 值和土壤 Eh。因此，当鸡粪施用量为 2.0%时，对糙米中总 Cd 、总 As 和无机 As 的影响较小。在间歇性灌溉条件下，鸡粪的施用在水稻生长的大部分时期增加了土壤 pH 值，降低了土壤 Eh。因此，鸡粪降低了糙米中总 Cd 、总 As 和无机 As 的含量。此外，随着鸡粪施用量的增加，Cd 和 As 的还原量也随之增加。在淹水条件下，鸡粪的施用在抽穗前增加了土壤 pH 值，但在抽穗后降低了土壤 pH 值。鸡粪的施用显著降低了糙米中的总 As 和无机 As 含量，对 Cd 的含量略有降低。随着鸡粪施用量的增加，总 As 浓度的降低量也随之增加。同时，当鸡粪浓度为 1.0%时，无机 As 浓度最低。
