Abstract
Background
Agroforestry is a promising approach for sustainable agriculture due efficient resource cycling and improved soil fertility. Bombax ceiba (Malvaceae), a tall tree with red flowers blooming in spring, is traditionally planted in rice fields in tropical Asia. However, the role of B. ceiba in the agroforestry systems remains unexplored.
Methods
We collected 81 soil samples at different distances to B. ceiba (0 m (D0), 1 m (D1), and 5 m (D5)) at a typical B. ceiba-rice agroforestry system in Hainan Island (south China) during three reproductive stages of rice- booting, heading and maturity. We assessed spatiotemporal variations of soil nutrient properties (by a soil nutrient analyzer (YT-TRX03)), and soil bacterial and fungal communities (by sequencing 16S rRNA gene and internal transcribed spacer (ITS) region, respectively).
Results
B. ceiba improved the soil nutrient conditions in a rice field, particularly the availability of potassium and soil organic matter. Soil microbial communities were significantly affected by the distances to B. ceiba and the reproductive stages of rice. Available potassium was the principal driver of soil bacterial diversity and structure. In contrast, fungal diversity was negatively correlated with total nitrogen, while soil organic matter was the main factor shaping fungal community structure.
Conclusions. Our results show that B. ceiba has positive impacts on abiotic traits of rice-growing soils. B. ceiba can change soil microbial community structure, however, the principal soil driver varied according to microbial taxa. These findings support the ecological basis of traditional agroforestry systems prevalent in tropical Asia.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We thank fundings from Major Science and Technology Project of Hainan Province (ZDKJ2021018), National Natural Science Foundation of China (41871041), Scientific Research Foundation of Hainan University (KYQD(ZR)-21110) and Natural Science Foundation of Hainan Province (Youth Project, 322QN247). Help from Beijing Allwegene Company (Beijing, China) for analysis of high throughput sequencing data is acknowledged. We also thank Zi-Jie Long and Xin Yang for their help in field sampling.
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Ming-Xun Ren and Pastor L. Malabrigo Jr. contributed to the study conception and design. Material preparation, data collection and analysis were performed by Jing Wen, Wen-Juan Wang, Wen-Qian Xiang and Ming-Xun Ren. The first draft of the manuscript was written by Wen-Juan Wang, Ming-Xun Ren commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Wang, WJ., Wen, J., Xiang, WQ. et al. Soil bacterial and fungal communities respond differently to Bombax ceiba (Malvaceae) during reproductive stages of rice in a traditional agroforestry system. Plant Soil 479, 543–558 (2022). https://doi.org/10.1007/s11104-022-05542-x
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DOI: https://doi.org/10.1007/s11104-022-05542-x