Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
The Ecohydrological Mechanisms Of Resilience And Vulnerability Of Amazonian Tropical Forests To Water Stress
Download The Ecohydrological Mechanisms Of Resilience And Vulnerability Of Amazonian Tropical Forests To Water Stress full books in PDF, epub, and Kindle. Read online The Ecohydrological Mechanisms Of Resilience And Vulnerability Of Amazonian Tropical Forests To Water Stress ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis The Ecohydrological Mechanisms of Resilience and Vulnerability of Amazonian Tropical Forests to Water Stress by : Bradley Christoffersen
Download or read book The Ecohydrological Mechanisms of Resilience and Vulnerability of Amazonian Tropical Forests to Water Stress written by Bradley Christoffersen and published by . This book was released on 2013 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: Predicting the interactions between climate change and ecosystems remains a core problem in global change research; tropical forest ecosystems are of particular importance because of their disproportionate role in global carbon and water cycling. Amazonia is unique among tropical forest ecosystems, exhibiting a high degree of coupling with its regional hydrometeorology, such that the stability of the entire forest-climate system is dependent on the functioning of its component parts. Belowground ecohydrological interactions between soil moisture environments and the roots which permeate them initiate the water transport pathway to leaf stomata, yet despite the disproportionate role they play in vegetation-atmosphere coupling in Amazonian forest ecosystems, the impacts of climate variability on the belowground environment remain understudied. The research which follows is designed to address critical knowledge gaps in our understanding of root functioning in Amazonian tropical forests as it relates to seasonality and extremes in belowground moisture regime as well as discerning which ecohydrological mechanisms govern ecosystem-level processes of carbon and water flux. A secondary research theme is the evaluation and use of models of ecosystem function as applied to Amazonia - these models are the "knowledge boxes" which build in the ecohydrological hypotheses (some testable than others) deemed to be most important for the forest ecosystems of Amazonia. In what follows, I investigate (i) which mechanisms of water supply (from the soil environment) and water demand (by vegetation) regulate the magnitude and seasonality of evapotranspiration across broad environmental gradients of Amazonia, (ii) how specific hypotheses of root function are or are not corroborated by soil moisture measurements conducted under normal seasonal and experimentally-induced extreme drought conditions, and (iii) the linkage between an extreme drought event with associated impacts on root zone soil moisture, the inferred response of root water uptake, and the observed impacts on ecosystem carbon and water flux in an east central Amazonian forest.
Book Synopsis Understanding Responses of Amazon Forests to Seasonal and Interannual Water Stress Based on Modeling Studies and Satellite Observations by : Binyan Yan
Download or read book Understanding Responses of Amazon Forests to Seasonal and Interannual Water Stress Based on Modeling Studies and Satellite Observations written by Binyan Yan and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the largest tropical forest in the world, the Amazon rainforest plays key roles in regulating regional and global carbon and hydrological cycles. Water availability is a major controlling factor in this ecosystem, in terms of shaping the species composition and distribution as well as controlling the seasonal dynamics. Given the large uncertainty in precipitation projections and the consequent debates as to the fate of the forest, there is a pressing need to examine the response of the forest to water availability. Here, I first consider the role of two mechanisms that buffer plants from impact of water stress, hydraulic redistribution by plant roots and an internal water pool inside tree trunks, both of which are omitted in the National Center for Atmospheric Research (NCAR) Community Land Model (CLM). The former efficiently redistributes soil water to facilitate easier access by plants, and the latter provides a closer-to-leaf water pool that is more readily accessible than the soil water pool. CLM simulations show that the inclusion of both mechanisms helps fix its overestimation of dry-season water stress. Based on satellite/ground observations and reanalysis data, we also analyze how plant growth responds to El Niño events that result in below-normal precipitation over large areas across the Amazon basin. We find that the influence of El Niño events on vegetation differs between wet and dry seasons, with the former mainly controlled by radiation and the latter by water availability.
Book Synopsis Resilience of Tropical Forest and Savanna by :
Download or read book Resilience of Tropical Forest and Savanna written by and published by . This book was released on 2018 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt:
