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| Effects of banana stem and its biochar on soil aggregates and carbon pool management in paddy soil cultivated for double cropping |
| Received:July 03, 2021 |
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| KeyWord:banana stem;biochar;soil aggregate stability;carbon pool management;double cropping paddy soil;Pearl River Delta |
| Author Name | Affiliation | E-mail | | WANG Chao | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | QIU Jingchi | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | LI Jianhua | Land Development and Reclamation Center of Guangdong Province, Guangzhou 510635, China | pomao@tom.com | | LU Ying | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | luying@scau.edu.cn | | LI Bo | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | TANG Xian | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | DONG Yuqing | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | HU Jiashuai | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | |
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| Abstract: |
| To investigate the feasibility of utilizing banana stem as a resource to improve quality of double-season rice soil, we selected a wide cultivation area in the Pearl River Delta region as research object. Laboratory culture experiments were conducted to identify changes in soil aggregate stability and organic carbon content after adding 0.5%, 1.0%, and 2.0% banana stem and/or its biochar, and to elucidate the comprehensive effects of adding different proportions of banana straw and its biochar on soil aggregate stability, carbon pool composition, and carbon pool management. Addition of banana stem increased the soil's >0.25 mm water-stable aggregate content, and aggregate stability index(ASI), and decreased the percentage of aggregate destruction(PAD) and unstable aggregate index(ELT). Banana stem biochar addition decreased >0.25 mm water-stable aggregates and ASI, and increased PAD and ELT. Addition of banana stem and its biochar increased soil total organic carbon(TOC) and active organic carbon(EOC) content, and decreased the soil carbon oxidation coefficient(Kos). Banana stem most potently increased EOC, and banana stem biochar most potently increased TOC. Soil treatment with banana stem and its biochar improved the soil carbon pool management index(CPMI) by increasing the carbon pool activity index(CPAI) and carbon pool index(CPI), respectively. Correlation analysis showed that soil aggregate stability was more dependent on the proportion in soil of EOC than TOC. Overall, banana stem addition was more beneficial to soil structure and accumulation of soil EOC, and 2.0% banana stem addition exerted the best effect on soil fertility. |
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