Journal
GEODERMA
Volume 408, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.geoderma.2021.115587
Keywords
Soil silicon deficiency; Bacterial community composition; Co-occurrence network; Environmental factors
Categories
Funding
- National Natural Science Founda-tion of China [51979141]
- Key Research and Development Program of Guangdong Province [2019B110205003]
- Shenzhen Science and Technology Innovation Commission [JSGG20191129094410446]
- George E. Hewitt Foundation for Medical Research
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Soil bacterial communities are significantly affected by silicon fertilization and the depletion of bioavailable silicon in agricultural soils is a pressing issue. The structure of bacterial communities in Si-deficient soils showed significant correlations with reactive Si content and changes in bacterial groups related to nutrient cycling were observed. This highlights the importance of improving agricultural silicon fertilization for agro-ecosystem health and sustainability.
Soil bacterial communities play a crucial role in the maintenance of agro-ecosystem functions. Silicon (Si) fertilization has important impacts on the structure and function of soil bacterial communities. However, bioavailable Si in agricultural soils is projected to become depleted because of continuous intensive farming practices. It is urgently needed to investigate how bacterial communities respond to the Si deficiency in agricultural soils. Here, we reveal that the contents of the dissolved and reactive fractions of Si in soils have seriously decreased at the field scale. The reactive Si levels in the topsoil in rice fields (77.83 +/- 41.14 mg/kg) were lower than the reported critical limit of Si for plant growth (85 mg/kg) and therefore require special attention. We investigated the composition of soil bacterial communities in these Si-deficient soils. Most dominant bacterial phyla and their subtaxa were significantly correlated with the reactive Si content. Modules II, IV, VI, and VIII within a co-occurrence network were significantly correlated with the reactive Si content. Notably, bacterial groups related to nitrogen, carbon, sulfur, and iron cyclings significantly changed in the Si-deficient soils. Soil reactive Si showed strong direct and indirect relationships with the composition of soil bacterial communities in croplands. The findings of this study will be useful for raising awareness of the need to improve agricultural Si fertilization for agro-ecosystem health and sustainability.
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