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| Effects of intercropping on soybean roots and nutrient uptake under different microplastic concentrations |
| Received:August 19, 2024 |
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| KeyWord:intercropping;microplastic concentration;root morphology;growth and development;nutrient uptake |
| Author Name | Affiliation | E-mail | | MING Chunyan | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | HE Shuran | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | CHEN Linkang | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | LI Xinwei | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | YE Yuanyuan | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | SONG Shijie | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | LONG Guangqiang | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | ZHAO Ping | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | 2586439210@qq.com |
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| Abstract: |
| In order to explore the effects of intercropping on root morphological characteristics and nutrient uptake of soybean under different concentrations of microplastics, and the mechanism of intercropping to alleviate the toxic effects of microplastics, in this study, four concentrations of microplastics（0%, 0.1%, 1%, 10%） and two planting patterns（soybean monoculture and maize-soybean intercropping）were set up by pot experiment. After 30 days and 60 days of sowing, the growth indexes, root characteristics, nutrient accumulation and absorption and soil physical and chemical properties of soybean were measured and analyzed. Compared with no microplastics, microplastics exposure significantly increased the total root length of soybean, but decreased the average root diameter and root activity, and reduced the cumulative uptake of nitrogen, phosphorus and potassium and total biomass of soybean. Compared with soybean monocropping at the same microplastic concentration, intercropping significantly increased the total root length 23.2%, total root surface area 39.8% and root activity 49.2% of soybean, and increased the cumulative uptake of nitrogen 35.6%, phosphorus 29.5% and potassium 32.0% of soybean. Redundancy and correlation analysis showed that total root length, root activity, nitrate nitrogen, available phosphorus and available potassium were the main factors affecting soybean growth and nutrient uptake. Intercropping can alleviate the inhibitory effect of microplastics on soybean growth and nutrient uptake by improving soybean root traits and soil nutrient availability. Moreover, the inhibition of crop growth and development by intercropping regulation of microplastics showed a“time effect”, that is, the mitigation effect of intercropping increased with the extension of crop growth period. |
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