Summary The large magnitude of predicted warming at high latitudes and the potential feedback ecosystems to atmospheric CO 2 concentrations make it important quantify both its effects on high‐latitude carbon balance. We analysed long‐term, daily surface meteorological records for 13 sites in Alaska north‐western Canada an 82‐y record river ice breakup date Tanana River interior Alaska. found increases winter spring temperature extrema all sites, with greatest minimum temperature, average...

A long history of fire suppression in the western United States has significantly changed forest structure and ecological function, leading to increasingly uncharacteristic fires terms size severity. Prior analyses severity California forests showed that time since last weather conditions predicted very well, while a larger regional analysis topography climate were important predictors high fire. There not yet been large-scale study incorporates topography, vegetation fire-year determine...

Across the southwestern United States, high-severity wildfire is causing increasingly large areas of tree mortality and removing seed sources required for natural regeneration these formerly conifer-dominated landscapes. Planting seedlings can accelerate reforestation, but in semi-arid US, survival planted conifer typically low. Our research examined how post-fire planting success influenced by climate, topographic, biotic, microclimate factors. We present data on a seedling experiment...

An ecological process model (BIOME-BGC) was used to assess boreal forest regional net primary production (NPP) and response short-term, year-to-year weather fluctuations based on spatially explicit, land cover biomass maps derived by radar remote sensing, as well soil, terrain daily information. Simulations were conducted at a 30-m spatial resolution, over 1205 km2 portion of the BOREAS Southern Study Area central Saskatchewan, Canada, 3-year period (1994–1996). NPP for study region...

More than 70 years of fire suppression by federal land management agencies has interrupted regimes in much the western United States. The result missed cycles is a buildup both surface and canopy fuels many forest ecosystems, increasing risk severe fire. frequency size fires increased recent decades, as area burned with high severity some ecosystems. A number studies have examined controls on occurrence, but none yet determined what extent We developed statistical models predicting for...

Abstract Forests provide a broad set of ecosystem services, including climate regulation. Other services can be dependent and are in part regulated by local‐scale decision‐making. In the southwestern United States, ongoing change is exacerbating legacy fire‐exclusion that has altered forest structure increased high‐severity wildfire risk. Management mitigate this risk reducing density restoring frequent surface fires, but at cost reduced carbon stocks. We sought to quantify role management...

Abstract In southwestern US forests, the combined impact of climate change and increased fuel loads due to more than a century human‐caused fire exclusion is leading larger severe wildfires. Restoring frequent dry conifer forests can mitigate high‐severity risk, but effects these treatments on vegetation composition structure under projected remain uncertain. We used forest landscape model assess thinning prescribed burns in across an elevation gradient, encompassing low‐elevation...

New research is finding that satellite‐based radar remote sensing techniques are particularly well‐suited for quantifying the transition of boreal regions from a frozen to thawed condition. The implications studying global warming far reaching. If timing or areal extent this freeze/thaw were change significantly, measurable changes in climate, hydrology, and biogeochemistry would result. Abrupt conditions occurs each year over roughly 50 million km 2 Earth's terrestrial surface at latitudes...

Abstract Models commonly used to project forest carbon response climate change reduce biodiversity a small number of plant functional types or traits for the sake computational efficiency at large spatial scales. We simulated sensitivity dominant woody vegetation in New Mexico using both generalized type and species‐specific model parameterization. Both parameterizations achieve reasonable current uptake rates aboveground biomass amount ecosystem scale. When are subjected increasing...

The western United States is projected to experience more frequent and severe wildfires in the future due drier hotter climate conditions, exacerbating destructive wildfire impacts on forest ecosystems such as tree mortality unsuccessful post-fire regeneration. While empirical studies have revealed strong relationships between topographical information plant regeneration, ecological processes ecosystem models either not fully addressed topography-mediated effects probability of or only...

Across the southwestern United States, high-severity wildfire is causing increasingly large patches of tree mortality, removing seed sources required for natural regeneration these formerly conifer-dominated landscapes. Planting seedlings can accelerate succession and restore ecosystem services that pre-wildfire forests provided, but in semi-arid US, survival planted conifer typically low. We present data on a seedling planting experiment within footprint 2011 Las Conchas Fire northern New...