title: Mechanisms for 1,3-Dichloropropene Dissipation in Biochar-Amended Soils.
abstract: Biochar, which is organic material heated under a limited supply of oxygen, has the potential to reduce fumigant emissions when incorporated in the soil, but the mechanisms are not fully understood. The objective of this study was to determine the effects of biochar properties, amendment rate, soil microbe, moisture, temperature, and soil type on the fate of 1,3-dichloropropene (1,3-D) isomers in laboratory incubation experiments by assessing the 1,3-D degradation rate and adsorption capacity. 1,3-D dissipation rates were significantly reduced due to strong adsorption by biochar, which was also strongly affected by biochar type. Following a 1% biochar amendment, the half-lives of 1,3-D in soil were increased 2.5-35 times. The half-lives of 1,3-D in soil were strongly affected by soil moisture, temperature, and amendment rate. The effects of sterilization on 1,3-D degradation were much smaller in biochar-amended soils than in nonsterilized soils, which suggests the importance of abiotic pathways with biochar's presence. Dissipation of 1,3-D in biochar was divided into adsorption (49-93%) and chemical degradation pathways. Biochar properties, such as specific surface area (SSA), pH, water content, carbon content, and feedstock, all appeared to affect 1,3-D dissipation with potentially complex interactions. The biochar (air-dry) water content was highly correlated with 1,3-D adsorption capacity and thus can serve as an important predictor for fumigant mitigation use. The fate of the adsorbed fumigant onto biochar requires further examination on potential long-term environmental impacts before guidelines for biochar as a field practice to control fumigant emissions can be formulated.
authors.affiliation: Institute of Plant Protection, Chinese Academy of Agricultural Sciences, State Key Laboratory for Biology of Plant Disease and Insect Pests , 2 Yuanmingyuan West Road, Beijing 100193, China.
authors.forename: Qiuxia
authors.initials: Q
authors.lastname: Wang
authors.affiliation: San Joaquin Valley Agricultural Sciences Center, Agricultural Research Service, U.S. Department of Agriculture , 9611 South Riverbend Avenue, Parlier, California 93646-9757, United States.
authors.forename: Suduan
authors.initials: S
authors.lastname: Gao
authors.affiliation: San Joaquin Valley Agricultural Sciences Center, Agricultural Research Service, U.S. Department of Agriculture , 9611 South Riverbend Avenue, Parlier, California 93646-9757, United States.
authors.forename: Dong
authors.initials: D
authors.lastname: Wang
authors.affiliation: Soil and Water Management Unit, Agricultural Research Service, U.S. Department of Agriculture, University of Minnesota , S531 Soils Building, 1529 Gortner Avenue, St. Paul, Minnesota 55108-6028, United States.
authors.forename: Kurt
authors.initials: K
authors.lastname: Spokas
authors.affiliation: Institute of Plant Protection, Chinese Academy of Agricultural Sciences, State Key Laboratory for Biology of Plant Disease and Insect Pests , 2 Yuanmingyuan West Road, Beijing 100193, China.
authors.forename: Aocheng
authors.initials: A
authors.lastname: Cao
authors.affiliation: Institute of Plant Protection, Chinese Academy of Agricultural Sciences, State Key Laboratory for Biology of Plant Disease and Insect Pests , 2 Yuanmingyuan West Road, Beijing 100193, China.
authors.forename: Dongdong
authors.initials: D
authors.lastname: Yan
mesh_terms: D000327:Adsorption; D000498:Allyl Compounds / Q000494:pharmacology*; D002244:Carbon; D002606:Charcoal / Q000737:chemistry / Q000494:pharmacology*; D052918:Environmental Restoration and Remediation; D006843:Hydrocarbons, Chlorinated / Q000494:pharmacology*; D006863:Hydrogen-Ion Concentration; D007536:Isomerism; D008956:Models, Chemical; D010575:Pesticides; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry; D013696:Temperature; D014867:Water
chemical_list: D000498:Allyl Compounds; D006843:Hydrocarbons, Chlorinated; D010575:Pesticides; D012987:Soil; D012989:Soil Pollutants; C540010:biochar; D014867:Water; D002606:Charcoal; D002244:Carbon; C023891:1,3-dichloro-1-propene
keywords: adsorption isotherm; biochar; chemical degradation; fumigant