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摘要
To investigate the potential ecological risks of heavy metals in pigeon manure fractions and their agricultural use, samples of pigeon manure were collected from meat pigeon breeding bases in eight cities of Guangdong Province. The contents of eight heavy metals (Cu, Zn, Cd, Cr, Ni, Pb, Hg, and As) and of total N, total P, and total K were detected, and the pollution degree of heavy metals in pigeon manure was evaluated by the single-factor and comprehensive contamination index method. At the same time, the safe agricultural use life of pigeon manure applied to soil was analyzed according to the content of total nitrogen required for rice, and was verified by Hakanson′s potential pollution evaluation method. The results showed that compared with the German standard for decomposed manure，there were mainly Cu and Zn exceedances in pigeon manure, which were 18.18% and 36.36%, respectively, and the total exceedance rate of the samples was 45.45%. The results of the single-factor pollution index method showed that out of all heavy metals assessed, 36.36%, 18.18%, and 18.18% of Zn, Cu, and Ni in pigeon manure were at the pollution level, respectively. The heavy metals that reached the warning levels and exceeded the pollution levels of the Nemero integrated pollution index were mainly Cu and Zn. Without considering heavy metal loss, there was no risk of heavy metal pollution in rice cultivation in Guangdong Province with continuous application of pigeon manure for 10 years. In the case of the dry farming system in rice fields, the safe agricultural use of pigeon manure could be for up to 50 years if the amount of total P required by the crop is used as the fertilization index. In conclusion, pigeon manure could cause heavy metal accumulation and pollution in agricultural use, thus, it is necessary to strengthen the safe utilization of pigeon manure. ? 2024, Editorial Board of Journal of Agro-Environment Science.
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