Rhizosphere soil nutrients and bacterial community diversity of four broad-leaved trees planted under Chinese fir stands with different stocking density levels

Frontiers in Forests and Global Change

Forests and Global Change

Liyan Wang¹  Yangyang Sun¹  Jing Li¹  Ming Li²  Xiangqing Ma²  Qingli Xu³  Mulualem Tigabu⁴ 

[1] College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, China;College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, China;Chinese Fir Engineering Technology Research Center of National Forestry and Grassland Administration, Fuzhou, Fujian, China;Pusang State-owned Forestry Farm, Shunchang, Fujian, China;Southern Swedish Forest Research Center, Faculty of Forest Science, Swedish University of Agricultural Sciences, Lomma, Sweden;

关键词: understory interplanting;    broad-leaved trees;    bacterial diversity;    rhizosphere soil;    soil nutrition;   

DOI  :  10.3389/ffgc.2023.1135692

 received in 2023-01-01, accepted in 2023-02-17,  发布年份 2023

来源: Frontiers

【 摘 要 】

ObjectiveRhizosphere soil nutrients and bacterial diversity of four broad-leaved tree species underplanted in Chinese fir plantation with different stand density levels were analyzed to reveal characteristics of the rhizosphere soil environment and selection of suitable underplanted tree species.MethodsChinese fir plantation with three density levels (900, 1,200, and 1,875 stems ha–1, respectively) were selected and underplanted with Michelia macclurei, Schima superba, Phoebe zhennan, and Tsoongiodendron odorum. The rhizosphere soil nutrients and bacterial community of the broad-leaved tree species were determined after 4 years.ResultsSignificant differences in rhizosphere nutrient content were detected among different tree density levels, where the contents of total K, available K and available P in 900 stems ha–1 stands were significantly higher than the other stocking density levels. There were also significant differences in the contents of total C, total N, total K, available K and available P in the rhizosphere soils of the four trees species, while there were no significant differences in pH and total P. Rhizosphere soil nutrient contents were higher under S. superba and M. macclurei than under P. zhennan and T. odorum. The rhizosphere soil nutrient contents and bacterial diversity decreased with the increase of stand density, and the bacterial diversity showed significant differences in the rhizosphere soils of P. zhennan, T. odorum and S. superba when underplanted in different stand densities. The bacterial diversity was positively correlated with the available P content of rhizosphere soils, suggesting that soil available P content plays an important role in shaping the structure of bacterial community.ConclusionThe nutrient contents and bacterial diversity of rhizosphere soils of underplated broad-leaved species decreased with increasing stand density of Chinese fir plantation. Rhizosphere soils of M. macclurei and S. superba were rich in nutrient contents and bacterial diversity. Thus, low density of Chinese fir plantation (900 stems ha–1) underplanted with M. macclurei and S. superba is suitable for the establishment of mixed forest, which will facilitate better tree growth and maintaining soil fertility to realize sustainable management of forests.

【 授权许可】

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Copyright © 2023 Wang, Sun, Li, Tigabu, Xu, Ma and Li.