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| Effects of intercropping on respiration rate of red soil in sloping farmland |
| Received:May 22, 2024 |
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| KeyWord:intercropping;soil respiration rate;soil temperature;soil moisture content;microbial biomass carbon;microbial biomass nitrogen |
| Author Name | Affiliation | E-mail | | WANG Qirui | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | YANG Chunhuai | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | LI Yongmei | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | WANG Ting | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | LI Wanting | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | ZHAO Jixia | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | zhaojixiacc@163.com |
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| Abstract: |
| To investigate the impacts of intercropping of red soil on soil respiration rate and soil microbial biomass carbon and nitrogen in sloping farmland. Through field experiments, taking red soil on sloping farmland as the research object, four treatments including soybean monoculture（MS）, maize monoculture（MM）, maize soybean intercropping（IMS）, and bare soil（CK）were set up to study the influence characteristics of different planting modes on soil respiration rate and the impact mechanism of related soil environmental factors. During the growth period of maize, the soil respiration rate, temperature, and moisture content under each planting mode show a unimodal trend of first increasing and then decreasing. The range of soil respiration changes under MS, MM, IMS, and CK treatments is 2.50-5.71, 2.74- 6.24, 2.34-5.33 μmol·m-2·s-1, 2.12-5.11 μmol·m-2·s-1, respectively; The overall soil respiration under intercropping treatment was lower than other treatments, and the total soil carbon emissions under IMS treatment were significantly reduced by 7.55% and 14.65% compared to MS and MM treatments.The soil respiration rate exhibits a strong positive correlation with soil temperature and moisture content, accounting for 87.4% to 97.0% and 78.7% to 89.5% of its variation, respectively. Compared with the single factor model, the two factor model（soil temperature and soil moisture content）can better explain the changes in soil respiration rate. Intercropping substantially elevates soil microbial biomass carbon and nitrogen levels, which subsequently exerts a notable impact on soil respiration rates. During the maize growth period, a notable linear positive relationship exists between soil microbial biomass carbon and nitrogen content, as well as soil respiration, across various planting modes. Studies show that reasonable intercropping mode can reduce soil respiration rate and soil carbon emission. |
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