期刊
JOURNAL OF FORESTRY RESEARCH
卷 33, 期 4, 页码 1349-1363出版社
NORTHEAST FORESTRY UNIV
DOI: 10.1007/s11676-021-01433-6
关键词
Soil chemical propertie; Enzyme activity; 16S rRNA amplicon sequencing; Bacterial community structure; Tax4Fun function prediction
类别
资金
- Natural Science Foundation of Guangdong Province [2020A1515011404]
- Guangxi Major Science and Technology Project [AA17204087-9]
- Guangdong Forestry SciTech Innovation Platform Project [2020-KYXM-09]
- China National Key R&D Program during the 13th Five-year Plan Period [2016YFD0600504]
- Operation Project for Guangdong Zhanjiang Eucalyptus Forest Ecosystem National Positioning Observation and Research Station [2019132141]
This study investigates the impacts of introducing non-legume native tree species on soil nutrients and bacterial community structure. The results show that converting monoculture Eucalyptus plantations into mixed plantations can reduce soil nutrient depletion and enhance the ecological function of soil microorganisms.
Multi-generational planting of Eucalyptus species degrades soil quality but the introduction of legumes can improve soil fertility and microbial diversity. However, the effects of introducing non-legume native tree species on soil nutrients and bacterial community structure remain poorly understood. This study investigated the impacts of the conversion of third generation monoculture Eucalyptus plantations to mixed systems including Eucalyptus urograndis with Cinnamomum camphora (EC) and E. urograndis with Castanopsis hystrix (EH), on soil chemical and biochemical properties and bacterial community structure, diversity and functions. First generation E. urophylla plantations were the control. Results show that planting the third generation Eucalyptus led to a significant decrease in pH, organic matter, nutrient content, enzyme activities (invertin, acid phosphataes, and urease), and bacterial alpha-diversity compare to the controls. However, the mixed planting showed significant improvement in soil chemical and biochemical attributes and bacterial alpha-diversity, although the E. urograndis and C. hystrix planting had no improvement. Chloroflexi (oligotrophic bacteria) were significantly enriched in third generation Eucalyptus and Eucalyptus + C. hystrix, while proteobacteria increased significantly in the E. urograndis with C. camphora plantings. The relative abundance of multiple metabolic pathways increased significantly in the third generation Eucalyptus plantations whereas membrane transport-related genes were enriched in soils of the mixed systems. The changes in bacterial community structures in the two mixed systems were driven by diversity, organic matter and acid phosphatase, while bacterial functions were affected by invertase, NO3--N, diversity and urease. These results suggest that the transformation of successive monoculture Eucalyptus plantations into mixed plantations reduces the depletion of soil nutrients and enhances the ecological function of soil microorganisms.
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