江西农业学报2023，Vol.35Issue(11)：128-134,141,8.DOI:10.19386/j.cnki.jxnyxb.2023.11.019
不同生物炭对赣南稀土尾矿地土壤有机碳矿化特性的影响
Effect of Different Biochar on Mineralization Characteristics of Soil Organic Carbon in Rare Earth Tailing Areas in Southern Jiangxi
摘要
Abstract
In order to explore the effects of different biochar on soil organic carbon mineralization characteristics of tailing land,ten biochar treatments of corn stover,corn kernel,rice straw,rice husk,reed straw,coconut husk,apricot husk,walnut husk,bamboo and woodchip biochar were set up in rare earth tailings land of southern Jiangxi to study the soil organic carbon mineralization and the characteristic parameters of biochar.The results showed that(1)the application of biochar promoted soil organic carbon mineralization under low organic matter(4.07 g/kg)soil conditions,and the rate of soil organic carbon mineralization was basically stable after the 15th day of incubation.The average rate of soil organic carbon mineralization of woodchip biochar was the strongest,which was three times higher than that of CK.The average rate of soil organic carbon mineralization of corncobs biochar was the weakest,which was not significantly different from that of CK.(2)The results of the binomial fitting curves showed that the R2 of the fit between biochar pH,Carbon content,nitrogen content and the cumulative mineralization of soil organic carbon were 0.7417,0.4524 and 0.6148,respectively.(3)Through the analyses of infrared spectra,the specific surface areas and pore diameters of the wood chips and corncob biochar,the corncob biochar had richer organic functional groups and larger BET specific surface area,pore diameter and total pore volume.The study showed that the addition of exogenous biochar improved the mineralization of soil organic carbon in the rare earth tailings site in southern Jiangxi,and the mineralization of soil organic carbon was the weakest in the case of corn cob biochar.The suitable characteristic parameters of biochar had a better potential in attenuating the mineralization of soil organic carbon.关键词
生物炭/稀土尾矿地/土壤有机碳矿化/特征参数Key words
Biochar/Rare earth tailing area/Soil organic carbon mineralization/Characteristic parameter分类
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龙云,吴强建,陈莎莎,桂伦,吁安,龚贵金,陈柳萌,康美花..不同生物炭对赣南稀土尾矿地土壤有机碳矿化特性的影响[J].江西农业学报,2023,35(11):128-134,141,8.基金项目
江西省重点研发计划项目(20214BBG74007) （20214BBG74007）
江西省重大科技研发专项"揭榜挂帅"项目(20213AAF02023) （20213AAF02023）
江西省定南县科技重大专项"生物炭介导下能源植物高效固碳技术研究与示范". （）
