Biochar addition enhances annual carbon stocks and ecosystem carbon sink intensity in saline soils of the Hetao Irrigation District, Inner Mongolia

Ruxin Zhang, Zhongyi Qu, Wei Yang, Liping Wang, Dongliang Zhang, Lu Liu, Junjie Li and Zhimin Zhang
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Ruxin Zhang: College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, P.R. China
Zhongyi Qu: College of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou, P.R. China
Wei Yang: College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, P.R. China
Liping Wang: College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, P.R. China
Dongliang Zhang: College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, P.R. China
Lu Liu: Northern Construction Management Department, China Three Gorges Renewables (Group) Co., Ltd., Beijing, P.R. China
Junjie Li: College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, P.R. China
Zhimin Zhang: Inner Mongolia Hetao Irrigation District Water Development Center Yichang Branch Center Yihe Canal Water Supply Station, Bayan Nur, P.R. China

Plant, Soil and Environment, 2024, vol. 70, issue 5, 263-275

Abstract: Biochar has demonstrated potential for stabilising high yields and sequestering carbon in dryland farmland, but it is unclear whether biochar affects the carbon sequestration capacity and carbon balance of annual farmland ecosystems. For this purpose, we conducted a plot control trial in salinised farmland in 2019-2021, where we set three treatments, control, and two biochar rates, 0 (CK), 15 (B15), and 30 t/ha (B30). The results showed that biochar application decreased soil organic carbon stocks in the early part of the experiment (first freeze and freeze period); these increased in the later part, and overall, the biochar treatments increased soil organic carbon storage by 3-6% compared with the control. Compared with the control (CK), biochar inhibited the total soil respiration rate and microbial respiration rate significantly (P < 0.05) during the crop growing period compared with the freeze-thaw period. After two years of freeze-thaw cycling, biochar application increased sunflower plant carbon sequestration and net primary productivity and suppressed total soil microbial respiration, thereby increasing net ecosystem productivity. Therefore, the application of biochar is conducive to carbon sequestration in farmland ecosystems and presents a carbon sink effect, thus being a good choice for improving the soil carbon pool and reducing emissions in the northern dry zone.

Keywords: food production; straw biochar; agroecosystem; salinisation; biomass; permafrost (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:70:y:2024:i:5:id:121-2023-pse

DOI: 10.17221/121/2023-PSE

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