title: Influence of ameliorating soil acidity with dolomite on the priming of soil C content and CO2emission.
abstract: Lime or dolomite is commonly implemented to ameliorate soil acidity. However, the impact of dolomite on CO2emissions from acidic soils is largely unknown. A 53-day laboratory study was carried out to investigate CO2emissions by applying dolomite to an acidic Acrisol (rice-rapeseed rotation [RR soil]) and a Ferralsol (rice-fallow/flooded rotation [RF soil]). Dolomite was dosed at 0, 0.5, and 1.5 g 100 g-1soil, herein referred to as CK, L, and H, respectively. The soil pH(H2O)increased from 5.25 to 7.03 and 7.62 in L and H treatments of the RR soil and from 5.52 to 7.27 and 7.77 in L and H treatments of the RF soil, respectively. Dolomite application significantly (p ≤ 0.001) increased CO2emissions in both RR and RF soils, with higher emissions in H as compared to L dose of dolomite. The cumulative CO2emissions with H dose of dolomite were greater 136% in the RR soil and 149% in the RF soil as compared to CK, respectively. Dissolved organic carbon (DOC) and microbial biomass carbon (MBC) increased and reached at 193 and 431 mg kg-1in the RR soil and 244 and 481 mg kg-1in the RF soil by H treatments. The NH4--N and NO3--N were also increased by dolomite application. The increase in C and N contents stimulated microbial activities and therefore higher respiration in dolomite-treated soil as compared to untreated. The results suggest that CO2release in dolomite-treated soils was due to the priming of soil C content rather than chemical reactions.
authors.affiliation: College of Resources and Environment, Huazhong Agricultural University, Wuhan, Hubei, 430070, China.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Shaaban
authors.affiliation: College of Resources and Environment, Huazhong Agricultural University, Wuhan, Hubei, 430070, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Wu
authors.affiliation: School of Environmental Engineering, Wuhan Textile University, Wuhan, 430073, China.
authors.forename: Qi-An
authors.initials: QA
authors.lastname: Peng
authors.affiliation: New South Wales Department of Primary Industries, Wollongbar, NSW, 2477, Australia.
authors.forename: Lukas
authors.initials: L
authors.lastname: van Zwieten
authors.affiliation: College of Resources and Environment, Huazhong Agricultural University, Wuhan, Hubei, 430070, China.
authors.forename: Muhammad Afzal
authors.initials: MA
authors.lastname: Chhajro
authors.affiliation: College of Resources and Environment, Huazhong Agricultural University, Wuhan, Hubei, 430070, China.
authors.forename: Yupeng
authors.initials: Y
authors.lastname: Wu
authors.affiliation: College of Resources and Environment, Huazhong Agricultural University, Wuhan, Hubei, 430070, China.
authors.forename: Shan
authors.initials: S
authors.lastname: Lin
authors.affiliation: College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, 430070, China.
authors.forename: Muhammad Mahmood
authors.initials: MM
authors.lastname: Ahmed
authors.affiliation: College of Resources and Environment, Huazhong Agricultural University, Wuhan, Hubei, 430070, China.
authors.forename: Muhammad Salman
authors.initials: MS
authors.lastname: Khalid
authors.affiliation: Department of Soil Science, Faculty of Agricultural Sciences and Technology, Bahauddin Zakariya University, Multan, Pakistan.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Abid
authors.affiliation: College of Resources and Environment, Huazhong Agricultural University, Wuhan, Hubei, 430070, China. rghu@mail.hzau.edu.cn.
authors.forename: Ronggui
authors.initials: R
authors.lastname: Hu
mesh_terms: D002119:Calcium Carbonate / Q000737:chemistry; D002244:Carbon / Q000737:chemistry; D002245:Carbon Dioxide; D008274:Magnesium / Q000737:chemistry; D009609:Nitrous Oxide; D012987:Soil / Q000737:chemistry*
chemical_list: D012987:Soil; D002245:Carbon Dioxide; D002244:Carbon; D002119:Calcium Carbonate; D008274:Magnesium; D009609:Nitrous Oxide; C028042:calcium magnesium carbonate
keywords: Agro-ecosystem; CO2 emissions; Carbon cycle; Liming; Soil pH