Divergent responses of the soil bacteria community to multi-level nitrogen enrichment in temperate grasslands under different degrees of degradation

Dong，Chengcheng1,2; Shi，Yu3,4; Wang，Junjian5,6; Zeng，Hui1; Wang，Wei2

2021

10.1002/ldr.3935

LAND DEGRADATION & DEVELOPMENT   影响因子和分区

1085-3278

1099-145X

Nitrogen (N) enrichment has been reported to affect the soil bacteria community in natural temperate grasslands. However, it remains unknown how the bacteria community responds to N enrichment in degraded grasslands. Here, we established multi-level N enrichment experiments in temperate grasslands under non-degraded (ND), moderately degraded (MD), severely degraded (SD), and extremely degraded (ED) sites in northern China. The bacteria community was investigated by high-throughput sequencing and linked to major abiotic and biotic factors. We found bacterial diversity was lower in ED grassland than the other grasslands, and community composition highly varied across the four degrees of degradation. Change in bacterial diversity was due to the different variations in dominant phyla, and soil phosphorus content contributed to the variation in community composition across grasslands under increasing degradation. In ND, MD, and SD grasslands, bacterial diversity was not significantly altered by N enrichment below 30 g-N m yr but declined when N enrichment was greater than 30 g-N m yr. The bacterial diversity loss was associated with the decreased soil pH under N enrichment. However, in ED grassland, bacterial diversity decreased when N enrichment was below 30 g-N m yr and remained unchanged when N enrichment was greater than 30 g-N m yr. Change in bacterial diversity was modulated by soil N availability. Besides, N enrichment shifted bacterial community composition via changing soil N availability. Our study identified bacterial diversity loss in ED grassland and differently nonlinear responses of bacterial diversity to multi-level N enrichment in grasslands under different degrees of degradation.

bacterial diversity community composition grassland degradation nitrogen addition threshold for bacterial diversity

SCI ; EI

英语

其他

Guang Dong Basic and Applied Basic Research Foundation[2020A1515110110] ; National Natural Science Foundation of China[31670325,31972939] ; National Program on Key Basic Research Project[2016YFC0500701]

Environmental Sciences & Ecology ; Agriculture

Environmental Sciences ; Soil Science

WOS:000635146200001

WILEY

20211410163476

Bacteria ; Forestry ; Nitrogen ; Soils

Biotechnology:461.8 ; Soils and Soil Mechanics:483.1 ; Chemical Products Generally:804

ENVIRONMENT/ECOLOGY

2-s2.0-85103374036

Scopus

1.School of Urban Planning and Design,Shenzhen Graduate School,Peking University,Shenzhen,China
2.College of Urban and Environmental Sciences and Key Laboratory for Earth Surface Processes of the Ministry of Education,Peking University,Beijing,China
3.State Key Laboratory of Soil and Sustainable Agriculture,Institute of Soil Science,Chinese Academy of Sciences,Nanjing,China
4.University of Chinese Academy of Sciences,Beijing,China
5.Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,China
6.State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,China

Dong，Chengcheng,Shi，Yu,Wang，Junjian,et al. Divergent responses of the soil bacteria community to multi-level nitrogen enrichment in temperate grasslands under different degrees of degradation[J]. LAND DEGRADATION & DEVELOPMENT,2021,32:3524-3535.

Dong，Chengcheng,Shi，Yu,Wang，Junjian,Zeng，Hui,&Wang，Wei.(2021).Divergent responses of the soil bacteria community to multi-level nitrogen enrichment in temperate grasslands under different degrees of degradation.LAND DEGRADATION & DEVELOPMENT,32,3524-3535.

Dong，Chengcheng,et al."Divergent responses of the soil bacteria community to multi-level nitrogen enrichment in temperate grasslands under different degrees of degradation".LAND DEGRADATION & DEVELOPMENT 32(2021):3524-3535.