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| Effects of long-term application of biochar on organic carbon and its fractions in dry red soil |
| Received:December 10, 2023 |
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| KeyWord:biochar;soil organic carbon;active carbon fraction;soil carbon pool |
| Author Name | Affiliation | E-mail | | WAN Yunxing | College of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | MOU Jinxia | College of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | YANG Ruoyan | College of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | CHEN Yunzhong | College of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | WANG Yuqin | College of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | SHAO Xiaohui | Sinochem Modern Agriculture(Hubei)Co., Ltd., Wuhan 430000, China | | | ZHU Qilin | College of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | WU Yanzheng | College of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | DAN Xiaoqian | College of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | TANG Shuirong | College of Breeding and Multiplication, Hainan University, Sanya 572025, China | | | AHMED S. Elrys | College of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | MENG Lei | College of Breeding and Multiplication, Hainan University, Sanya 572025, China | menglei94@sohu.com |
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| Abstract: |
| This study aimed to investigate the effects of long-term application of biochar on soil organic carbon（SOC）and its active fractions. A laboratory experiment was conducted to investigate the effects of short-term（1 month）application of biochar（BF）and threeyear application of biochar（BA）on SOC and its fractions. The results showed that the application of BF significantly increased SOC content, particulate organic carbon（POC）, easily oxidized organic carbon（EOC）, light fraction organic carbon（LFOC）, and microbial biomass carbon（MBC）. The POC, EOC, LFOC and MBC increased by 97.5% - 241.5%, 21.8% - 59.4%, 66.8% - 202.7%, and 83.7% - 199.9%, respectively, relative to those observed with no biochar addition. Compared with BF, BA significantly reduced SOC, EOC, POC, and MBC levels but significantly increased dissolved organic carbon（DOC）content. Compared with no biochar addition, the carbon pool management index（CPMI）significantly increased in response to BF and BA treatments. The CPMI showed increases of 48.81%, 89.73%, 54.66%, and 157.48% in response to treatments with 1% BF, 2% BF, 1% BA, and 2% BA, respectively. The correlation analysis showed a significant and positive correlation between SOC content and MBC, POC, LFOC, and EOC levels. Therefore, the application of biochar can achieve soil carbon sequestration. However, with the extension of application years, the CPMI was significantly reduced, which reduced the stability of SOC. |
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