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The long-term productivity of forest ecosystems depends on the cycling of nutrients. The effect of carbon dioxide fertilization on forest productivity may ultimately be limited by the rate of nutrient cycling. Contemporary and future disturbances such as climatic warming, N-deposition, deforestation, short rotation sylviculture, fire (both wild and controlled), and the invasion of exotic species all place strains on the integrity of ecosystem nutrient cycling. Global differences in climate, soils, and species make it difficult to extrapolate even a single important study worldwide. Despite advances in the understanding of nutrient cycling and carbon production in forests, many questions remain. The chapters in this volume reflect many contemporary research priorities. The thirteen studies in this volume are arranged in the following subject groups: • N and P resorption from foliage worldwide, along chronosequences and along elevation gradients; • Litter production and decomposition; • N and P stoichiometry as affected by N deposition, geographic gradients, species changes, and ecosystem restoration; • Effects of N and P addition on understory biomass, litter, and soil; • Effects of burning on soil nutrients; • Effects of N addition on soil fauna.
leaf stoichiometry --- Cyclocarya paliurus --- geographic variations --- natural populations --- climate variables --- nitrogen --- phosphorus --- N:P ratio --- soil stoichiometry --- soil nutrient --- nutrient limitations --- natural grassland --- natural forest --- soil fauna --- N addition --- soil profile --- community structure --- food resources --- poplar plantations --- experimental nitrogen addition --- understory plant growth --- plant nutrient --- nonstructural carbohydrates --- Alpine treeline --- Nitrogen --- Non-structural carbohydrates --- Phosphorus --- Potassium --- Remobilization --- Storage --- Upper limits --- nutrient resorption --- nitrogen and phosphorous --- planted forests --- climate zones --- plant functional types --- precipitation --- green leaf nutrient --- nitrogen deposition --- N and P colimitation --- leaf N:P stoichiometry --- soil N:P stoichiometry --- seasonal variations --- nutrition resorption --- ecological stoichiometry --- plant-soil feedback --- stand age --- Robinia pseudoacacia L. --- forests --- nutrients --- disturbance --- management --- diversity --- biomass --- soil properties --- experimental fires --- UV-spectroscopy analysis --- thermal infrared thermometer --- nitrogen and phosphorus addition --- understory plants --- stoichiometric ratio --- litter decomposition --- litter standing crop carbon --- conversion coefficient --- climatic factors --- Tibetan Plateau --- shrublands --- Cunninghamia lanceolata --- mixture effect --- nutrient cycling --- rhizosphere effect --- species competition
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Concerns have been raised with respect to the state of high-altitude and high-latitude treelines, as they are anticipated to undergo considerable modifications due to global changes, and especially due to climate warming. As high-elevation treelines are temperature-limited vegetation boundaries, they are considered to be sensitive to climate warming. As a consequence, in this future, warmer environment, an upward migration of treelines is expected because low air and root-zone temperatures constrain their regeneration and growth. Despite the ubiquity of climate warming, treeline advancement is not a worldwide phenomenon: some treelines have been advancing rapidly, others have responded sluggishly or have remained stable. This variation in responses is attributed to the potential interaction of a continuum of site-related factors that may lead to the occurrence of locally conditioned temperature patterns. Competition amongst species and below-ground resources have been suggested as additional factors explaining the variability in the movement of treelines. This Special Issue (book) is dedicated to the discussion of treeline responses to changing environmental conditions in different areas around the globe.
n/a --- tree seedling recruitment --- shrubline --- light quality --- higher altitude --- precipitation --- experimental rain exclusion --- Pinus cembra --- Changbai Mountain --- treeline dynamics --- fungal ecology --- thermal continentality --- tree regeneration --- elevational transect --- monitoring --- conifer shrub --- plant water availability --- permafrost --- foehn winds --- treeline --- Holocene --- nitrogen cycling --- carotenoids --- timberline --- 15N natural abundance --- spectrometer --- basal area increment --- palynology --- xylem embolism --- diversity --- elevational treeline --- European Alps --- temperature --- tree line --- winter stress --- photosynthetic pigments --- Pinus sibirica --- westerly winds --- relative air humidity --- ecosystem manipulation --- Larix decidua --- microsite --- polar treeline --- Central Austrian Alps --- Switzerland --- multi-stemmed growth form --- conifers --- forest edge --- history of treeline research --- soil drought --- dendroclimatology --- knowledge engineering --- Rocky Mountains --- apical control --- cloud --- postglacial --- alpine timberline --- space-for-time substitution --- climate change --- expert elicitation --- shoot elongation --- pit aspiration --- climate warming --- climate zone --- alpine treeline --- refilling --- Abies sibirica --- growth trend --- western Montana --- light quantity --- Picea abies --- Mediterranean climate --- forest climatology --- altitude --- environmental stress --- sub-Antarctic --- Erman’s birch --- photoinhibition --- tocopherol --- elevational gradients --- NDVI --- long-term trends --- sap flow --- peat --- tree seedlings --- Southern Ocean --- chlorophyll --- non-structural carbohydrates (NSCs) --- drought --- upward advance --- remote sensing data --- Erman's birch
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