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| Carbon budget of sugarcane cultivation in Guangxi with temporal and spatial variation and source analysis from 2003 to 2022 |
| Received:September 18, 2024 |
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| KeyWord:sugarcane;agricultural carbon budget;carbon emission;carbon sink;STIRPAT model |
| Author Name | Affiliation | E-mail | | LI Shubin | Guangxi Research Institute of Metrology & Test, Nanning 530001, China | | | DENG Yun | Guangxi Research Institute of Metrology & Test, Nanning 530001, China | | | LU Xuan | Guangxi Research Institute of Metrology & Test, Nanning 530001, China | 15607816663@163.com | | LI Huayang | Guangxi Research Institute of Metrology & Test, Nanning 530001, China | | | WAN Yuanzhi | Guangxi Research Institute of Metrology & Test, Nanning 530001, China | |
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| Abstract: |
| This research aimed to quantify the carbon emissions and carbon sink during the sugarcane cultivation phase in Guangxi, analyzed the spatiotemporal variations and their driving factors. Agricultural budget, including carbon emissions and carbon sinks, was estimated and analyzed using total agricultural inputs, crop residue burning amounts, and crop yield from Guangxi Statistical Database and Compilation of National Agricultural Product Cost-Benefit Data using the emission factor approach and the carbon sequestration parameter method. Based on this, the key factors influencing agricultural carbon budgets were identified using the revised Stochastic Impacts by Regression on Population, Affluence and Technology（STIRPAT）model. The study revealed that sugarcane cultivation in Guangxi acted as a net carbon sink, with more carbon being sequestrated than emitted. Carbon emissions rose from 1.323 5×106 t in 2003 to a peak of 2.445 7× 106 t in 2013, before dropping to 1.609 1×106 t in 2022. Meanwhile, the carbon sink increased from 1.125 87×107 t in 2003 to 1.601 22×107 t in 2022. Greenhouse gas emissions in terms of carbon equivalents from fertilizer use, particularly nitrogen fertilizers, were the main source of carbon emissions, contributing between 61.25% and 72.99% of the total. Carbon emissions from straw burning also increased, rising from 28.18% to 32.16%. The regions of Chongzuo, Nanning, Laibin, and Liuzhou were identified as the main areas where carbon emissions and carbon sink were concentrated. The STIRPAT analysis highlighted that fertilizer use, farming technology, planting scale, and sugarcane yield were key factors affecting carbon emissions and carbon sink, with different impacts depending on the size of the cultivation area. Carbon emissions and carbon sink in Guangxi′ s sugarcane cultivation were significantly influenced by fertilizer use, farming technology, and the scale of cultivation. Sugarcane cultivation demostrated a high level of carbon sinks in Guangxi. |
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