Publications by authors named "Jonathan Gewirtzman"
Article Synopsis
- The study compares low-cost CO sensors to a high-end reference instrument, assessing their accuracy and performance across different price points.
- Among the tested sensors, the more expensive Vaisala models showed the best accuracy, while the budget-friendly Sunrise sensors still performed reasonably well, and the K30 had more variability in its readings.
- Machine learning techniques, particularly a combination of linear regression and decision tree models, were effective for calibrating sensors, with a stack ensemble model enhancing accuracy by about 65%.
Article Synopsis
- Nitrogen availability for plants has been decreasing globally, a trend known as nitrogen oligotrophication, particularly in northeastern U.S. forests, which is worsened by climate change.
- The study investigated how urbanization and forest fragmentation affect nitrogen cycling in oak-dominated forests from Boston to central Massachusetts, finding that urban forests had higher nitrogen availability compared to rural forests.
- While urban areas showed increased nitrogen uptake by trees, this effect diminished at forest edges, suggesting that forest fragmentation negatively impacts nitrogen availability and tree demand.
The effect of climate change on phenology and growth is less understood for belowground plant tissues than for aboveground plant tissues, particularly in high-latitude regions. Ecotypes within a species adapted to a locality may display different responses to climate change. We established two common garden plots in the Arctic tundra north of the Brooks Range in northern Alaska.
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- Soil warming due to climate change can impact the cycling of silica in forest ecosystems, which has previously been unexplored.
- Researchers conducted a 15-year study at Harvard Forest to measure silica concentrations in various soil types and plant materials under both warmed and control conditions.
- Findings suggest that while warming increases silica uptake by plants and accelerates its release from decaying litter, it does not change soil biogenic silica stocks, indicating a more complex interplay in silica cycling that could affect its transfer to marine systems.