Treesearch
Displaying 7,931 - 7,940 of 65,199 Publications- Forest ecosystems are increasingly affected by a range of tree mortality events, which may permanently alter forest functional traits and disrupt their ecosystem services. While individual forest disturbances are well studied, interactions between multiple disturbances and changes of spatial patterns of forested landscapes are rarely quantified. In this study, we aim to analyze the role of wildfire in the Big Sur ecoregion of California on the spread of Phytophthora ramorum, an invasive pathogen which causes sudden oak death, the most important driver of mortality across 1000 km of...AuthorsYinan He, Gang Chen, Richard C. Cobb, Kaiguang Zhao, Ross K. MeentemeyerKeywordsSourceForest Ecology and Management. 486(8): 118987.Year2021
- Native bark beetles and wildfires are important disturbances in western coniferous forests. We consider two common interactions between bark beetles and wildfires (1) the effects of fuel reduction treatments (prescribed fire and mechanical thinning) and wildfires on bark beetles, and (2) the effects of bark beetle epidemics and associated levels of tree mortality on fuels and wildfire behavior and severity. We briefly describe the current state of knowledge and identify gaps for making informed management decisions.AuthorsChristopher J. Fettig, Sharon M. Hood, Justin B. Runyon, Chris M. StallingSourceFire Management Today. 79(1): 14-23.Year2021
- Group harvesting is often used to regenerate mid-tolerant tree species. However, in managed northern hardwood forests of the Great Lakes region, regeneration failures are common among mid-tolerant species regardless of gap size. Coppicing advance regeneration has the potential to alter recruitment patterns within harvest gaps, as some mid-tolerant species have large dormant season carbohydrate reserves in the root system. However, the comparative sprouting abilities of northern hardwood saplings are not well quantified. Furthermore, variation in light availability and chronic browsing from...AuthorsJohn Willis, Michael B. Walters, Evan J. FarinosiKeywordsSourceForest Ecology and ManagementYear2021
- This study was established to evaluate underplanting as a method of reestablishing a shortleaf pine (Pinus echinata Mill.) component to a dry upland hardwood stand in the Piedmont region of the southeastern United States. Replicated treatment plots were harvested to retain four levels (approximately 0, 3, 7, and 10 m2 of basal area per hectare) of residual overstory density. One-year-old containerized seedlings with both smaller (93.4 cm3) and larger (113.1 cm3) plugs and bareroot seedlings were underplanted beneath the residual overstory treatments. After five growing seasons, seedling...AuthorsDavid K. Schnake, Scott D. Roberts, John Willis, John D. Kushla, Ian A. MunnKeywordsSourceForest ScienceYear2021
- Runoff and erosion processes can increase after wildfire and post‐fire salvage logging, but little is known about the specific effects of soil compaction and surface cover after post‐fire salvage logging activities on these processes. We carried out rainfall simulations after a high‐severity wildfire and post‐fire salvage logging to assess the effect of compaction (uncompacted or compacted by skid traffic during post‐fire salvage logging) and surface cover (bare or covered with logging slash). Runoff after 71 mm of rainfall across two 30‐min simulations was similar for the bare plots...AuthorsSergio A. Prats, Maruxa C. Malvar, Joseph WagenbrennerKeywordsSourceHydrological Processes. 35(1): e13997Year2021
- Alaska is among northern high‐latitude regions where accelerated climate change is expected to impact streamflow properties, including seasonality and primary flow drivers. Evaluating changes to streamflow, including flood characteristics, across this large and diverse environment can be improved by identifying the distribution and influence of flow drivers. Using metrics of mean monthly streamflow data from 253 streamgages, seasonal flow regimes were clustered to guide identification of seasonal flow drivers and form hydrologic groups for identification of peak‐flow populations. Nine...AuthorsJanet H. Curran, Frances BilesKeywordsSourceWater Resources Research. 57(2): 1-21.Year2021
- This publication describes a large collection of gravel bedload transport measurements taken in numerous small Rocky Mountain streams (the database is available at https://www.fs.fed.us/biology/nsaec/projects-bedloadtraps.html). The database was developed for gravel bedload data collected between 1998 and 2015 during 14 campaigns at 12 field sites in 9 Rocky Mountain streams in Colorado and Wyoming and 1 stream in the Cascade Mountains in eastern Oregon. The data were collected with bedload traps - large, unflared samplers that had been specially developed to obtain representative samples...AuthorsKristin Bunte, Kurt W. SwingleKeywordsSourceGen. Tech. Rep. RMRS-GTR-420. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 24 p. https://doi.org/10.2737/RMRS-GTR-420Year2021
- Peatlands are wetland ecosystems with great significance as natural habitats and as major global carbon stores. They have been subject to widespread exploitation and degradation with resulting losses in characteristic biota and ecosystem functions such as climate regulation. More recently, large-scale programmes have been established to restore peatland ecosystems and the various services they provide to society. Despite significant progress in peatland science and restoration practice, we lack a process-based understanding of how soil microbiota influence peatland functioning and mediate...AuthorsJonathan P. Ritson, Danielle M. Alderson, Clare H. Robinson, Alexandra E. Burkitt, Andreas Heinemeyer, Andrew G. Stimson, Angela Gallego-Sala, Angela Harris, Anne Quillet, Ashish A. Malik, Beth Cole, Bjorn J.M. Robroek, Catherine M. Heppell, Damian W. Rivett, Dave M. Chandler, David R. Elliott, Emma L. Shuttleworth, Erik Lilleskov, Filipa Cox, Gareth D. Clay, Iain Diack, James Rowson, Jennifer Pratscher, Jonathan R. Lloyd, Jonathan S. Walker, Lisa R. Belyea, Marc G. Dumont, Mike Longden, Nicholle G.A. Bell, Rebekka R.E. Artz, Richard D. Bardgett, Robert I Griffiths, Roxane Andersen, Sarah E. Chadburn, Simon M. Hutchinson, Susan E. Page, Tim Thom, William Burn, Martin G. EvansSourceScience of The Total EnvironmentYear2021
- Forest residues and logging slash from pre-commercial forest thinning and regeneration harvests are a potential feedstock for bioenergy production but there has been a concern about the impact of residue removal on forest soil C and N. This study aimed to address such by conducting two meta-analyses using the data available from published literature and an independent dataset compiled from the North American Long-Term Soil Productivity (LTSP) study. For the meta-analysis using literature, we categorized forest harvesting and biomass removal into i) no harvest control, ii) bole-only (BO,...AuthorsDeborah S. Page-Dumroese, Matt D. Busse, Brian J. J. Palik, Jason James, Jianwei Zhang, Bob Eaton, Robert A. Slesak, Joanne M. Tirocke, Hoyoung KwonKeywordsSourceForest Ecology and ManagementYear2021
- A key uncertainty in quantifying dead wood carbon (C) stocks—which comprise ~8% of total forest C pools globally—is a lack of accurate dead wood C fractions (CFs) that are employed to convert dead woody biomass into C. Most C estimation protocols utilize a default dead wood CF of 50%, but live tree studies suggest this value is an over-estimate. Here, we compile and analyze a global database of dead wood CFs in trees, showing that dead wood CFs average 48.5% across forests, deviating significantly from 50%, and varying systematically among biomes, taxonomic divisions, tissue types, and...AuthorsAdam R. Martin, Grant M. Domke, Mahendra Doraisami, Sean C. ThomasKeywordsSourceNature CommunicationsYear2021