Mixed Plantations Improve Soil Bacterial Similarity by Reducing Heterogeneous Environmental Selection

Author:

Dai Handan1,Dong Biao1,Yang Zhu1,Yuan Yidan1,Tan Yuhua1,Huang Yongtao1,Zhang Xiao23

Affiliation:

1. Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions, The College of Geography and Environmental Science, Henan University, Kaifeng 475004, China

2. College of Forestry, Northwest A&F University, Xianyang 712100, China

3. Qinling National Forest Research Station, Huoditang, Ningshan, Ankang 711600, China

Abstract

Monocultures and mixed plantations have long been applied in forestry and landscape restoration to maximize the benefits of plantations. These different plantations can have unpredictable effects on the forest ecosystem. Monocultures and mixed plantations may influence soil bacterial communities, yet the underlying mechanisms of the soil bacterial community similarity response to monocultures and mixed plantations are still unknown. This study aimed to unravel how the community assembly processes and their associated factors mediate soil bacterial community similarity among monocultures and mixed plantations. We present a conceptual model to understand the mechanisms controlling soil bacterial community similarity among monocultures and mixed plantations. We tested these conceptual model hypotheses and the underlying mechanisms by conducting experiments in three plantation forest regions in southern China. We found that different monocultures led to a highly dissimilar environment, which increased heterogeneous selection and resulted in a high dissimilarity of soil bacterial communities among monocultures. Compared with monocultures, mixed plantations afford more similar environmental conditions for soil bacterial communities and decrease the heterogeneous selection process, leading to a higher soil bacterial similarity among mixed plantations. In addition, we demonstrate that stochastic processes are also the dominant driver in determining the soil bacterial community similarity among mixed plantations. Overall, the conversion from monocultures to mixed plantations affects the community assembly process by altering environmental similarity and edaphic factors, subsequently determining the similarity of soil bacterial communities. Our study can provide scientific guidance for exploring the role of mixed plantations in forest management.

Funder

Natural Science Foundation of China

Natural Science Foundation of Henan Province

Publisher

MDPI AG

Subject

Forestry

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