Plant Soil Environ., 2023, 69(9):437-445 | DOI: 10.17221/245/2023-PSE

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

Keke Hua1,3,4, Wenbo Yang1,2, Bo Zhu3
1 Soil and Fertiliser Research Institute, Anhui Academy of Agricultural Sciences; Anhui Provincial Key Laboratory of Nutrient Recycling, Resources and Environment, Hefei, P.R. China
2 Anhui Agricultural University, Hefei, P.R. China
3 Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, P.R. China
4 National Agricultural Experimental Station for Soil Quality, Taihe, P.R. China

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

Received: June 16, 2023; Revised: August 27, 2023; Accepted: August 28, 2023; Prepublished online: September 28, 2023; Published: September 29, 2023  Show citation

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Hua K, Yang W, Zhu B. Long-term organic fertilisers application increase plant autotrophic, soil heterotrophic respiration and net ecosystem carbon budget in a hillslope agroecosystem. Plant Soil Environ. 2023;69(9):437-445. doi: 10.17221/245/2023-PSE.
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