Effects of different grassland use patterns on soil bacterial communities in the karst desertification areas

Frontiers in Microbiology

Microbiology

Shuzhen Song¹  Yongkuan Chi²  Kangning Xiong² 

[1] School of Karst Science, Guizhou Normal University, Guiyang, China;School of Karst Science, Guizhou Normal University, Guiyang, China;Guizhou Engineering Laboratory for Karst Desertification Control and Eco-Industry, Guiyang, China;

关键词: artificial grassland;    soil microorganism;    sustainable utilization;    karst desertification;    Illumina sequencing;   

DOI  :  10.3389/fmicb.2023.1208971

 received in 2023-04-20, accepted in 2023-08-07,  发布年份 2023

来源: Frontiers

【 摘 要 】

Soil bacteria are closely related to soil environmental factors, and their community structure is an important indicator of ecosystem health and sustainability. A large number of artificial grasslands have been established to control rocky desertification in the karst areas of southern China, but the influence of different use patterns on the soil bacterial community in artificial grasslands is not clear. In this study, three grassland use patterns [i.e., grazing (GG), mowing (MG), and enclosure (EG)] were used to investigate the effects of different use patterns on the soil bacterial community in artificial grassland by using 16S rDNA Illumina sequencing and 12 soil environmental indicators. It was found that, compared with EG, GG significantly changed soil pH, increased alkaline hydrolyzable nitrogen (AN) content (P < 0.05), and decreased soil total phosphorus (TP) content (P < 0.05). However, MG significantly decreased the contents of soil organic carbon (SOC), total phosphorus (TP), available nitrogen (AN), ammonium nitrogen (NH4+-N), β-1,4-glucosidase (BG), and N-acetyl-β-D-glucamosonidase (NAG) (P < 0.05). The relative abundance of chemoheterotrophy was significantly decreased by GG and MG (P < 0.05). GG significantly increased the relative abundance of Acidobacteria and Gemmatimonadota (P < 0.05) and significantly decreased the relative abundance of Proteobacteria (P < 0.05), but the richness index (Chao 1) and diversity index (Shannon) of the bacterial community in GG, MG, and EG were not significantly different (P > 0.05). The pH (R2 = 0.79, P = 0.029) was the main factor affecting the bacterial community structure. This finding can provide a scientific reference for ecological restoration and sustainable utilization of grasslands in the karst desertification areas.

【 授权许可】

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Copyright © 2023 Chi, Song and Xiong.