Advanced searches left 3/3

Temperate Rain forest - Crossref

Summarized by Plex Scholar
Last Updated: 12 April 2022

* If you want to update the article please login/register

Suicidal forests? – Modelling biomass surcharge as a potential landslide driver in temperate rainforests of Chilean Patagonia

Field results in Northern Chilean Patagonia's Valdivia rainforest reveal a remarkably low landslide rate under undisturbed conditions, despite young tree stands' high geomorphological activity. We assign biomass-rich forests, as the ones blanketing the hillslopes of Pumalin National Park investigated here, to solve this mystery. We suspect that Patagonian rainforests are an integral system in which efficient biomass accumulation promotes landsliding, which in turn controls cyclic and fast landscape turnovers. To test this hypothesis, we build a physics-based numerical ecohydrologic and slope stability model using Python-toolkit Landlab to measure forest biomass dynamics on hillslope stability. According to our results, biomass surcharge could result in landslides in up to 9 % of the entire study area under pressures of 700 t st ;t ha -1 biomass, with the upper segments of steep hillslopes being the most vulnerable to failure. However, root cohesion and slope failure dominated slope stability, biomass surcharge transiently outweighed the influence of root cohesion and slope failure during a time span of more than five years since landscape disruption, with root cohesion clearly dominating slope stability. We estimate 100 years as a minimum period needed for forests that have been undisturbed for many centuries, after which biomass-rich forest stands can become intrinsically instable, thus suicidal, and ultimately cause landscape regeneration. Our results reveal the immense potential of integrating vegetation dynamics and especially time-varying biomass surcharges to predict slope stability in biomass-rich temperate rainforests.

Source link: https://doi.org/10.5194/egusphere-egu22-4002


Extreme Winds Alter Influence of Fuels and Topography on Megafire Burn Severity in Seasonal Temperate Rainforests under Record Fuel Aridity

During the historic 2020 fire season, nearly 0. 8 million hectares of land was burned in the North American Pacific Northwest over two weeks amid record-breaking fuel aridity and winds, marking a rare example of megafires in forests west of the Cascade Mountains. Given the common knowledge in climate-limited fire policies that regional fire regimes outnumber local controls on vegetation mortality patterns, we hypothesized that local controls remained significant influences on fire severity patterns in these rugged forested landscapes. We constructed remote sensed fire extent and severity charts for two distinct weather periods in order to minimize the effects of strong east winds on burn severity. Wind was the primary source of the 2020 megafires, according to our findings, but also that topography and vegetation architecture played a large role in burn severity patterns even under extreme fuel aridity and winds.

Source link: https://doi.org/10.3390/fire5020041

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions