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Effect of Michelia macclurei intercropping on soil properties and microbial population in young rubber plantation

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Abstract

The rubber tree is an economically important tree planted in many tropical countries. While rubber planting has improved the livelihoods of growers, it has also resulted in soil degradation. However, systematic studies on assessment of soil health and its management in rubber plantations are limited. The present study explored whether intercropping of Michelia macclurei (an ornamental evergreen tree) in rubber plantation could help conserve soil health compared to traditional monoculture practice with randomised complete block design. The rubber tree density was the same in monoculture and intercropping, with the addition of Michelia macclurei in intercropping. The effects of soil properties and microbial communities was used to analyse two different planting patterns of rubber monoculture and rubber intercropping using soil sampling from field plots. The study investigated variation in soil physical structure, soil moisture, soil nutrients, soil microbes, and enzyme activities in two types of rubber plantations viz. a monoclonal plantation without intercrop (RM) and a plantation with Michelia macclurei as an intercrop (RAS). The results from above study showed an increase in soil organic carbon (SOC), total nitrogen (TN), ammonium nitrogen (AN), available phosphorus (AP), nitrate nitrogen (NN) and total potassium (TK) in plantation with intercrop as compared to monoclonal plantation without intercrop. When comparing the corresponding values of RM to RAS, bacteria and total microbial abundance of RAS increased on average by 75.51% and 48.42%, respectively. In addition, after the transition from rubber monoculture to rubber agroforestry, the annual average of SOC, TN, AP, TK nutrients and pH in soil increased by 10.94%, 4.25%, 14.53%, 1.34% and 9.74%, respectively. Soil water content, soil bulk density and soil porosity were not significantly different between RM and RAS treatments. Sucrase activity and cellulase activity also increased in the RAS intercropping system. These results show that intercropping promotes soil organic matter and microbial communities and enhances soil enzyme activities. These findings indicate that rubber intercropping creates healthy soil environments conducive to tree growth and improves the ecosystem sustainability of rubber plantations. Healthier and stronger rubber trees may increase rubber production and provide sustainable management of plantations in the future.

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Acknowledgements

We are thankful to Dr. Wang DF for providing relevant standard soil profile resource in Hainan Island.

Funding

This project is supported by this research was funded by Hainan Provincial Natural Science Foundation of China (320RC736; 319MS090), China Agriculture Research System (CARS-33-ZP3). The authors are grateful to above grants that financially supported this work.

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Authors and Affiliations

  1. Rubber Research Institute, Ministry of Agriculture and Rural Affairs, Chinese Academy of Tropical Agricultural Sciences/Danzhou Investigation & Experiment Station of Tropical Crops, Hainan Danzhou National Field Scientific Observation Research station of Tropical Agricultural Ecosystem, 571737, Danzhou, PR China

    Dongling Qi, Zhixiang Wu, Guoyu Lan & Chuan Yang

  2. College of Ecology and Environment, Hainan University, 570228, Haikou, PR China

    Dongling Qi & Xiaobo Yang

  3. HNU-ASU Joint International Tourism College, Hainan University, 570228, Haikou, PR China

    Fang Zhang

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  1. Dongling Qi
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Qi, D., Zhang, F., Wu, Z. et al. Effect of Michelia macclurei intercropping on soil properties and microbial population in young rubber plantation. J Rubber Res (2024). https://doi.org/10.1007/s42464-024-00256-4

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