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Journal of Integrative Agriculture  2025, Vol. 24 Issue (2): 517-526    DOI: 10.1016/j.jia.2023.12.011
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Enhancing carbon sequestration and greenhouse gas mitigation in semiarid farmland: The promising role of biochar application with biodegradable film mulching

Jinwen Pang1, 2, Zhonghong Tian1, 2, Mengjie Zhang1, 2, Yuhao Wang 1, 2, Tianxiang Qi1, Qilin Zhang1, Enke Liu3, Weijun Zhang4, Xiaolong Ren1, 2, Zhikuan Jia1, 2, Kadambot H. M. Siddique5, Peng Zhang1, 2#

1 College of Agronomy, Northwest A&F University, Yangling 712100, China

2 Key Laboratory of Crop Physiology, Ecology and Tillage Science in Northwestern Loess Plateau, Ministry of Agriculture and Rural Affairs, Northwest A&F University, Yangling 712100, China

3 Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China

4 Crop Research Institute, Ningxia Academy of Agricultural and Forestry Sciences, Yinchuan 750199, China

5 The UWA Institute of Agriculture, The University of Western Australia, Perth WA6001, Australia

 Highlights 
Biochar application could reduce CO2 and N2O emissions but enhancing CH4 absorption.
The soil organic carbon sequestration gradually increased with the biochar application rate increase.
High biochar application rate (9 t ha–1) was the most effectively on greenhouse gas emission reduction and crop yield increased under film mulching.
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摘要  

地膜覆盖由于能够提高半干旱地区农田生产力而被广泛使用然而长期地膜覆盖导致温室气体排放增加同时会过度消耗土壤,不利于生产的可持续性生物炭作为一种养分含量的物质,我们设想在土壤中添加生物炭能否解决这一问题。因此,我们和不覆膜两种种植模式设置4种生物炭添加(无生物炭添加(N)=0 t ha -1,低量添加(L)=3 t ha -1,中量添加(M)=6 t ha -1,高量添加(H)=9 t ha -1)通过研究两者种植方式下不同生物炭添加量农田温室气体排放、土壤有机碳固存(SOCS)和玉米产量的影响,评估农田生态系统的生产力和可持续性。三年试验结果表明提高了玉米产量(18.68—41.80%)茎秆(23.64%)、籽粒(28.87%)和根系(46.31%)固碳,温室气体排放量(CO2,10.78%;N2O,3.41%)但降低了SOCS(6.57%)和温室气体排放强度(GHGI;13.61%)条件下,添加生物炭显著提高玉米产量(10.20%)茎秆(17.97%)、籽粒(17.69%)、根系(16.75%)中固碳量SOCS(4.78%);并降低温室气体排放(CO2,3.09%;N2O,6.36%)及其强度(GHGI;12.28%)且影响效果与生物炭添加量呈正相关关系当生物炭添加9.0 t ha – 1时,增产减排效果最佳总体而言添加生物炭降低了膜下玉米田CO2N2O的排放,增加了CH4的吸收,提高了玉米产量在降低增温潜势的同时,提高土壤固碳能力,因此降解膜下施加9.0 t ha – 1生物炭可作为半干旱区农田可持续发展的管理措施



Abstract  
Long-term mulching has improved crop yields and farmland productivity in semiarid areas, but it has also increased greenhouse gas (GHG) emissions and depleted soil fertility.  Biochar application has emerged as a promising solution for addressing these issues.  In this study, we investigated the effects of four biochar application rates (no biochar (N)=0 t ha–1, low (L)=3 t ha–1, medium (M)=6 t ha–1, and high (H)=9 t ha–1) under film mulching and no mulching conditions over three growing seasons.  We assessed the impacts on GHG emissions, soil organic carbon sequestration (SOCS), and maize yield to evaluate the productivity and sustainability of farmland ecosystems.  Our results demonstrated that mulching increased maize yield (18.68–41.80%), total fixed C in straw (23.64%), grain (28.87%), and root (46.31%) biomass, and GHG emissions (CO2, 10.78%; N2O, 3.41%), while reducing SOCS (6.57%) and GHG intensity (GHGI; 13.61%).  Under mulching, biochar application significantly increased maize yield (10.20%), total fixed C in straw (17.97%), grain (17.69%) and root (16.75%) biomass, and SOCS (4.78%).  Moreover, it reduced the GHG emissions (CO2, 3.09%; N2O, 6.36%) and GHGI (12.28%).  These effects correlated with the biochar addition rate, with the optimal rate being 9.0 t ha–1.  In conclusion, biochar application reduces CO2 and N2O emissions, enhances CH4 absorption, and improves maize yield under film mulching.  It also improves the soil carbon fixation capacity while mitigating the warming potential, making it a promising sustainable management method for mulched farmland in semiarid areas.
Keywords:  biochar       film mulching        greenhouse gas emissions        carbon sequestration  
Received: 24 July 2023   Accepted: 17 November 2023
Fund: This research was supported by the National Key Research and Development Program of China (2021YFE0101300, 2021YFD1901102), the Project Supported by Natural Science Basic Research Plan in Shaanxi Province of China (2023-JC-YB-185), and the Ningxia key research and development program (2023BCF01018).
About author:  #Correspondence Peng Zhang, E-mail: pengzhang121@hotmail.com

Cite this article: 

Jinwen Pang, Zhonghong Tian, Mengjie Zhang, Yuhao Wang, Tianxiang Qi, Qilin Zhang, Enke Liu, Weijun Zhang, Xiaolong Ren, Zhikuan Jia, Kadambot H. M. Siddique, Peng Zhang. 2025. Enhancing carbon sequestration and greenhouse gas mitigation in semiarid farmland: The promising role of biochar application with biodegradable film mulching. Journal of Integrative Agriculture, 24(2): 517-526.

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