Effects of Fertilizer Application Intensity on Carbon Accumulation and Greenhouse Gas Emissions in Moso Bamboo Forest–Polygonatum cyrtonema Hua Agroforestry Systems
Author:
Chen Huiying1234, Cheng Xuekun1234, Zhang Xingfa5, Shi Haitao1234ORCID, Chen Jiahua1234, Xu Ruizhi1234, Chen Yangen6, Ying Jianping7, Wu Yixin5, Zhou Yufeng1234, Shi Yongjun1234
Affiliation:
1. State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China 2. Zhejiang Province Key Think Tank, Institute of Ecological Civilization, Zhejiang A&F University, Hangzhou 311300, China 3. Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration of Zhejiang Province, Zhejiang A&F University, Hangzhou 311300, China 4. School of Environmental and Resources Science, Zhejiang A&F University, Hangzhou 311300, China 5. Forestry Bureau of Qujiang District, Quzhou 324000, China 6. Agriculture and Rural Bureau of Lin’an District, Hangzhou 311300, China 7. Forestry and Water Bureau of Longyou County, Quzhou 324000, China
Abstract
Agroforestry management has immense potential in enhancing forest carbon sequestration and mitigating climate change. Yet the impact and response mechanism of compound fertilization rates on carbon sinks in agroforestry systems remain ambiguous. This study aims to elucidate the impact of different compound fertilizer rates on soil greenhouse gas (GHG) emissions, vegetation and soil organic carbon (SOC) sinks, and to illustrate the differences in agroforestry systems’ carbon sinks through a one-year positioning test across 12 plots, applying different compound fertilizer application rates (0 (CK), 400 (A1), 800 (A2), and 1600 (A3) kg ha−1). The study demonstrated that, after fertilization, the total GHG emissions of A1 decreased by 4.41%, whereas A2 and A3 increased their total GHG emissions by 17.13% and 72.23%, respectively. The vegetation carbon sequestration of A1, A2, and A3 increased by 18.04%, 26.75%, and 28.65%, respectively, and the soil organic carbon sequestration rose by 32.57%, 42.27% and 43.29%, respectively. To sum up, in contrast with CK, the ecosystem carbon sequestration climbed by 54.41%, 51.67%, and 0.90%, respectively. Our study suggests that rational fertilization can improve the carbon sink of the ecosystem and effectively ameliorate climate change.
Funder
Key Research and Development Program of Zhejiang Province Joint Research Fund of the Department of Forestry of Zhejiang Province and the Chinese Academy of Forestry National Natural Science Foundation of China
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