Muhammad Shaaban1, Lei Wu1, Qi-An Peng2, Lukas van Zwieten3, Muhammad Afzal Chhajro1, Yupeng Wu1, Shan Lin1, Muhammad Mahmood Ahmed4, Muhammad Salman Khalid1, Muhammad Abid5, Ronggui Hu6. 1. College of Resources and Environment, Huazhong Agricultural University, Wuhan, Hubei, 430070, China. 2. School of Environmental Engineering, Wuhan Textile University, Wuhan, 430073, China. 3. New South Wales Department of Primary Industries, Wollongbar, NSW, 2477, Australia. 4. College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, 430070, China. 5. Department of Soil Science, Faculty of Agricultural Sciences and Technology, Bahauddin Zakariya University, Multan, Pakistan. 6. College of Resources and Environment, Huazhong Agricultural University, Wuhan, Hubei, 430070, China. rghu@mail.hzau.edu.cn.
Abstract
Lime or dolomite is commonly implemented to ameliorate soil acidity. However, the impact of dolomite on CO2 emissions from acidic soils is largely unknown. A 53-day laboratory study was carried out to investigate CO2 emissions 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-1 soil, 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 CO2 emissions in both RR and RF soils, with higher emissions in H as compared to L dose of dolomite. The cumulative CO2 emissions 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-1 in the RR soil and 244 and 481 mg kg-1 in 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 CO2 release in dolomite-treated soils was due to the priming of soil C content rather than chemical reactions.
Lime or n class="Chemical">dolomite is commonly implemented to ameliorate soil acidity. However, the impact of dolomite on CO2 emissions from acidic soils is largely unknown. A 53-day laboratory study was carried out to investigate CO2 emissions 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-1 soil, 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 CO2 emissions in both RR and RF soils, with higher emissions in H as compared to L dose of dolomite. The cumulative CO2 emissions 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-1 in the RR soil and 244 and 481 mg kg-1 in 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 CO2 release in dolomite-treated soils was due to the priming of soil C content rather than chemical reactions.
Entities:
Keywords:
Agro-ecosystem; CO2 emissions; Carbon cycle; Liming; Soil pH
Authors: Catherine Hénault; Hocine Bourennane; Adeline Ayzac; Céline Ratié; Nicolas P A Saby; Jean-Pierre Cohan; Thomas Eglin; Cécile Le Gall Journal: Sci Rep Date: 2019-12-27 Impact factor: 4.379