Impact of soybean stover- and pine needle-derived biochars on Pb and As mobility, microbial community, and carbon stability in a contaminated agricultural soil.
Biochar is gaining attention as a potential soil amendment to remediate and revitalize the contaminated soils. Simultaneous effects of biochar on metals mobility, microbial abundance, bacterial diversity and carbon storage in soil are scarcely addressed. This study assessed the effect of biochars on metal mobility, microbial abundance, bacterial community, and carbon storage in an agricultural soil contaminated with heavy metals. Biochars derived from soybean stover at 300 and 700 °C (S-BC300 and S-BC700, respectively) and pine needles at the same temperatures (P-BC300 and P-BC700, respectively) were used. A maximum reduction of Pb mobility by 95% was observed from a soil treated with S-BC700, associated with precipitation of chloropyromorphite and hydroxylpyromorphite. In contrast, As was desorbed from soil particles because of P competition. The abundance of Gram-positive and negative bacteria, fungi, actinomycetes, and arbuscular mycorrhizal fungi increased in the soils treated with biochar produced at 300 °C, possibly due to the high dissolved organic and active organic carbons. Microbial abundance in the soils treated with S-BC700 and P-BC700 was constant due to the existence of fixed or non-labile carbon. Changes to bacterial communities in the biochar-treated soils depended on feedstock type and pyrolysis temperature. Actinobacteria substantially increased whereas Acidobacteria and Chloroflexi decreased in the biochar-treated soils. The non-labile carbon fraction was ∼25 fold higher in the biochar-treated soil than the control soil, indicating long-term carbon storage.
Korea Biochar Research Center & Department of Biological Environment, Kangwon National University, Chuncheon 24341, Republic of Korea; Soil Sciences Department, College of Food & Agricultural Sciences, King Saud University, P.O. Box 2460, Riyadh 11451, Saudi Arabia.
Mahtab
M
Ahmad
Korea Biochar Research Center & Department of Biological Environment, Kangwon National University, Chuncheon 24341, Republic of Korea.
Yong Sik
YS
Ok
Agricultural Microbiology Division, National Academy of Agricultural Science, Rural Development Administration, Wanju 54875, Republic of Korea.
Byung-Yong
BY
Kim
Agricultural Microbiology Division, National Academy of Agricultural Science, Rural Development Administration, Wanju 54875, Republic of Korea.
Jae-Hyung
JH
Ahn
Division of Environment-friendly Agriculture Research, Gyeongsangnam-do Agricultural Research and Extension Service, Jinju 52733, Republic of Korea.
Young Han
YH
Lee
Department of Environmental Engineering, China Jiliang University, Hangzhou 310018, China.
Ming
M
Zhang
Department of Environmental Engineering, Chosun University, Gwangju 61452, Republic of Korea.
Deok Hyun
DH
Moon
Soil Sciences Department, College of Food & Agricultural Sciences, King Saud University, P.O. Box 2460, Riyadh 11451, Saudi Arabia.
Mohammad I
MI
Al-Wabel
Korea Biochar Research Center & Department of Biological Environment, Kangwon National University, Chuncheon 24341, Republic of Korea. Electronic address: sslee97@kangwon.ac.kr.
Sang Soo
SS
Lee
D000383:Agriculture; D001151:Arsenic / Q000032:analysis / Q000302:isolation & purification; D001419:Bacteria / Q000187:drug effects; D002244:Carbon / Q000032:analysis; D002606:Charcoal / Q000737:chemistry*; D005658:Fungi / Q000187:drug effects; D007854:Lead / Q000032:analysis / Q000302:isolation & purification; D019216:Metals, Heavy / Q000032:analysis / Q000302:isolation & purification*; D028223:Pinus / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry; D012987:Soil / Q000737:chemistry / Q000592:standards*; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000032:analysis / Q000302:isolation & purification*; D013025:Glycine max / Q000737:chemistry*; D013696:Temperature
D019216:Metals, Heavy; D012987:Soil; D012989:Soil Pollutants; C540010:biochar; D002606:Charcoal; D007854:Lead; D002244:Carbon; D001151:Arsenic
Bacterial community; Biochar; Carbon storage; Heavy metals; Immobilization; Precipitation