Long-term organic fertilisers application increase plant autotrophic, soil heterotrophic respiration and net ecosystem carbon budget in a hillslope agroecosystem

Keke Hua, Wenbo Yang and Bo Zhu
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Keke Hua: Soil and Fertiliser Research Institute, Anhui Academy of Agricultural Sciences; Anhui Provincial Key Laboratory of Nutrient Recycling, Resources and Environment, Hefei, P.R. China
Wenbo Yang: Soil and Fertiliser Research Institute, Anhui Academy of Agricultural Sciences; Anhui Provincial Key Laboratory of Nutrient Recycling, Resources and Environment, Hefei, P.R. China
Bo Zhu: Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, P.R. China

Plant, Soil and Environment, 2023, vol. 69, issue 9, 437-445

Abstract: The effects of long-term various organic fertilisers application on ecosystem respiration components and net carbon budget have rarely been investigated in a hillslope agricultural ecosystem. Hence, we measured the rates of plant autotrophic (Ra) and soil heterotrophic respiration (Rh) from 2011 to 2012 with five treatments: no fertiliser (CK); mineral fertiliser (MF); MF combined with swine manure (MFS); MF combined with crop straw (MFC), and swine manure (SM). Our results confirm that Ra was found to be more temperature-moisture sensitive than Rh, whereas Rh was more temperature sensitive than Ra. Soil microbial biomass carbon (MBC) is a major factor influencing the temperature sensitivity coefficient of Rh (Q10), thereby application of organic fertilisers combined with mineral fertilisers (MFS and MFC) significantly increased annual by 19.3% and 17.2% compared with MF treatment. Annual carbon emissions via Rh and Ra under MFS, MFC and SM treatments were increased by 24.6, 28.5, 48.8% and 6.6, 10.6, 1.8%, respectively compared with MF treatment (4.6 and 23.2 t C/ha/year). Net primary production (NPP) under MFS, MFC and SM treatments were increased by 5.4, 6.01, and 15.6% relative to MF treatment (13.6 t C/ha/year), respectively, and the corresponding net ecosystem carbon budget (NECB) increased by 121.2, 172.8, and 342.4%. Our findings establish that long-term organic fertilisers application increase plant autotrophic, heterotrophic respiration and net ecosystem carbon budget, which can increase the carbon sink function. Overall, crop straw combined with mineral fertiliser is a feasible agronomy practice to increase carbon sink function, reduce soil erosion and maintain crop yield.

Keywords: carbon cycle; wheat; maize; farmyard manure; carbon balance; sloping croplands (search for similar items in EconPapers)
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:69:y:2023:i:9:id:245-2023-pse

DOI: 10.17221/245/2023-PSE

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