Ammonium and Nitrate Nitrogen Alter Bacterial Community in the Rhizospheres and Root Surfaces with Seedling Growth of Two Tree Species
2024
Hai-Yan Liang | Yanru Wang | Xiaoqiang Quan | Xing-Hao Tang | Lidong Wang | Xiaoyu Li | Lu-Ping Qu | Xiao-Li Yan
Ammonium nitrogen (NH4+-N) and nitrate nitrogen (NO3&minus:-N) that can be absorbed and utilized by plants are heterogeneously distributed in soil, which affects plant growth and bacterial communities in the roots. To investigate the effects of single and mixed nitrogen (N) on bacterial communities in the rhizospheres and root surfaces of Cunninghamia lanceolata (CR, CRS) and Schima superba (SR, SRS), we subjected three different ratios of NH4+-N to NO3&minus:-N 2:0, 1:1 (control, CK), 0:2 to cultivate the seedlings. Compared with the CK, the ratio of 0:2 increased the number, diversity, and composition of bacteria in CR, whereas the ratios of 2:0 and 0:2 both decreased in CRS, SR, and SRS. The bacterial diversities were both R >: RS in two tree species, but there was no discernible trend between the two tree species in the rhizosphere and root surface. Proteobacteria and Bacteroidota were the dominant bacterial phyla in CR and CRS, whereas Proteobacteria and Acidobacteriota dominated in SR and SRS. Patescibacteria and Planctomycetota promoted the aboveground growth of C. lanceolata but negatively drove root growth. Patescibacteria and Cyanobacteria in SR were related to its root growth, whereas the Actinobacteriota in SR and SRS, and the Patescibacteria and Cyanobacteria in SRS, promoted its aboveground growth. Overall, the mixed N addition was more conducive to bacterial community proliferation than single N on rhizospheres compared to root surfaces. The opposite reactions were observed from the aboveground and underground growth, which were driven by a few dominant bacterial phyla.
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