Journal
PLANT AND SOIL
Volume 435, Issue 1-2, Pages 95-109Publisher
SPRINGER
DOI: 10.1007/s11104-018-3863-7
Keywords
N2O emission; Nitrification; Denitrification; Acid forest soil; Tree species; Seasonal change
Categories
Funding
- National Key Research and Development Program of China [2016YFD0200307]
- National Natural Science Foundation of China [41771335, 41271280]
- Hunan Provincial Natural Science Foundation of China [2016JJ3133]
Ask authors/readers for more resources
AimsTree species and seasonal change influence N2O flux and microbial communities, but the mechanisms are unclear. We studied N2O flux in soils planted with slash pine and oil-seed camellia trees. We sampled on typical days of the four seasons. We tested whether N-cycling communities respond more to tree species or seasonal change. We assessed how tree species affect N2O flux.MethodsWe used qPCR and RFLP to determine abundance and community composition of amoA-containing bacteria (AOB) and archaea (AOA), and denitrifiers that contain the narG, nirK, nirS, and nosZ genes.ResultsN(2)O flux rate and soil characteristics varied significantly between forest soils and sampling seasons. Abundance of all detected genes, but not of the nirS gene, was significantly affected by tree species. Differences in gene abundance between days in different seasons were found only for narG, nirK, and nosZ. Functional microbial community composition in the soil varied between the tree species for most of the genes studied, but varied, not significantly, slightly among sampling days. Differences in the abundance and community composition of nitrifiers and denitrifiers between tree species depended on soil concentration of NH4+, NO3-, and dissolved organic carbon (DOC). N2O flux rate was affected by community composition, but not abundance of nitrifiers and denitrifiers. Temperature, NO3-, and DOC concentrations significantly affected N2O flux.ConclusionsTree species influenced N2O flux more than seasonal change, by altering community composition and environmental factors rather than nitrifier/denitrifier abundance.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available