Soil extracellular enzyme activities in plots dominated by trees that associate with arbuscular mycorrhizal or ectomycorrhizal fungi in the N fertilized and reference watershed at the Bear Brook Watershed in Maine, USA.
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Our objective was to detect possible differences in N fertilization
responses of soil extracellular enzymes in plots dominated by trees
that associate with arbuscular mycorrhizal fungi (AM) or
ectomycorrhizal fungi (ECM). To do this, we established a plot network
of 6 AM and 6 ECM dominated (>65% diameter at breast height) 10 x
10 m plots in the lower elevation hardwood zone of both the reference
and N fertilized watersheds (N=24 plots) at Bear Brook Watershed, in
Maine USA. We assayed the potential activity of hydrolytic enzymes
that release N (N-acetylglucosaminidase; NAG), phosphorus (acid
phosphatase; AP), and simple carbon (ß-glucosidase; BG). In addition,
we measured microbial allocation to complex C degrading oxidative
enzymes phenol oxidase and peroxidase. The activities of these enzymes
were measured separately in bulk mineral, rhizosphere, and organic
horizon soils during the growing season in 2016.
创建时间：
2021-01-06
