期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 625, 期 -, 页码 1423-1432出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2017.12.180
关键词
Nitrogen availability; PLFA; Extracellular enzymes; Afforestation; Deforestation
资金
- National Key R & D Program of China [2016YFD0600206, 2017YFC0505501]
- National Natural Science Foundation of China [31770746, 31270491]
- SJTU Agri-X funding [Agri-X2015004]
It is well established that land use change can have a profound impact on soil physicochemical properties but the associated changes in soil microbial communities are poorly understood. We used long-term research sites in a subtropical alluvial island of eastern China to measure changes in soil physicochemical properties and microbial community abundance and composition (via phospholipid fatty acid (PLEA) analysis) and function (via extracellular enzyme activity) across different land use types developed on the same soil matrix, including a camphor (Cinnainomum aimphorci) plantation, a chronosequence of differently aged dawn redwood (Metusequoia glyptastroboides) plantings, a deforested land and a rice paddy. We hypothesized that afforestation could improve soil quality by enhancing carbon (C) and nitrogen (N) contents, microbial biomass and enzyme activities, but that this effect would vary depending on forest age and tree species. Soil C and N concentrations, PLEA abundances and activities of decomposition enzymes (0-glucosidase, urease, alkaline phosphatase and catalase) in older plantations all increased significantly compared to cropland. These variables changed little or decreased in deforested land compared to cropland. These variables also increased with planting age in the dawn redwood plantings. Soils under camphor plantations had higher soil nutrient contents, microbial biomass and lower enzyme activities than dawn redwood soils with similar age. We also found some significant relationships between soil chemical and biological properties: PLEA abundances were positively related to soil organic matter (SOM) contents; the fungal-to-bacterial ratio and fungal relative abundance were correlated positively with SOM contents and negatively with C/N ratio; both soil PLEA abundances and enzyme activities were positively linked with soil inorganic N content and potential net N mineralization rate; ratio of specific C, N and P (phosphorus) acquisition activities was limited to 10: 1: 10 across land use types. Our study underscores the fact that land use type can have a profound impact on soil microbial communities; in addition, tree species and planting age also play significant roles in afforestation. (C) 2017 Elsevier B.V. All rights reserved.
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