2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/20/2019 | 11:30 AM - 11:45 AM | SPATIAL HETEROGENEITY OF NITROGEN FIXATION AND DENITRIFICATION ACROSS A WETLAND-STREAM-LAKE INTERFACE | 250 AB
SPATIAL HETEROGENEITY OF NITROGEN FIXATION AND DENITRIFICATION ACROSS A WETLAND-STREAM-LAKE INTERFACE
Wetland – stream –lake interfaces are spatially heterogeneous and connected through cross-interface processes that alter material form and export across these ecosystems. Moreover, this heterogeneity may facilitate the co-occurrence of biogeochemical processes that are favored under incompatible environmental conditions, like N2 fixation and denitrification. We measured rates of N2 fixation and denitrification, along with a suite of environmental drivers, in 15 locations along 3 wetland-stream-lake interfaces of Lake Superior and northern Lake Huron. N2 fixation ranged from 0 – 1970 µg/m2/h, while denitrification ranged from 0-11500 µg/m2/h across all interfaces. N2 fixation occurred primarily in wetland sediment and on the macrophytes in streams and lakes, while denitrification occurred exclusively on sediments in all three habitats. Logistic regression showed organic matter content was an important predictor of the occurrence of denitrification (p = 0.04), but identified no significant models for N2 fixation. We will assess if microbial gene abundance is related to process rates and environmental drivers. Understanding the spatial complexity of biogeochemical processes is key for understanding how ecosystems respond to human and natural disturbance, which often simplifies and homogenizes habitats.
- Nitrogen
- Spatial
- Hotspot
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Presenters/Authors
Erin Eberhard
(), Michigan Technological University , ekeberha@mtu.edu;
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Amy Marcarelli
(), Michigan Technological University, ammarcar@mtu.edu;
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