Carbon storage in desertified lands : a case study from North China
Biogéochimie ; Carbonate ; Chine ; Chine du Nord ; Cycleducarbone ; Domaine aride ; Désertification ; Effet de serre ; Sol
Arid area ; Biogeochemistry ; Carboncycle ; Carbonate ; China ; Desertification ; Greenhouse effect ; Northern China ; Soil
Regional accumulations of pedogenic carbonates were examined relative to precipitation, altitude, and temperature. The largest accumulations of pedogenic carbonates were found in calcic soils in warm, arid areas. In the naturally desertified lands
of China, total stored carbon, including carbonatecarbon, is 1,8-fold more than organic carbone alone. The carbon released through land desertification in China may be an important factor affecting changes in concentrations of greenhouse gases worldwide.
Changement global ; Corrélation ; Cycleducarbone ; Dioxyde de carbone ; Effet de serre ; Population ; Prévision ; Réchauffement climatique ; Siècle 21
Carboncycle ; Carbon dioxide ; Climatic warming ; Correlation ; Forecast ; Global change ; Greenhouse effect ; Population ; Twenty-first century
Aspects clés du problème du changement global du climat en mettant l'accent sur la dynamique ducycleducarbone. Suggestion d'un modèle simple semi-empirique basé sur l'utilisation de la relation entre les émissions globales de dioxyde de carbone
Continental water cycle and carbon reservoirs and their relationships in the past
Biogéochimie ; Biomasse ; Changement global ; Cycle de l'eau ; Cycleducarbone ; Géochimie ; Holocène ; Pléistocène
Biogeochemistry ; Biomass ; Carboncycle ; Geochemistry ; Global change ; Holocene ; Pleistocene ; Water cycle
In short review paper, the A. discusses the role of studies on changes in the continental water cycle for a better understanding of temporal change in biomass production and carbon storage. All calculations made for the late Pleistocene and Holocene
should take into consideration not only the subsequent rises in temperature, precipitation and carbon storage, but also secondary hydrologic variations, which differ spatially due to climatic zonation as well as to geography, lithology and other factors
. To a large extend, the present-day picture of the water cycle and biomass production is tranformated by man. - (DG)
Cycle biogéochimique ; Cycle de l'azote ; Cycleducarbone ; Ecologie quantitative ; Ecosystème ; Formation herbacée ; Kazahskaja SSR ; Kazahstan ; Sibir' ; URSS d'Asie
Asian part of USSR ; Biogeochemical cycle ; Carboncycle ; Ecosystem ; Grassland ; Kazakhstan ; Nitrogen cycle ; Quantitative ecology ; Siberia
Caractéristiques de la dynamique ducycle biologique ducarbone dans les écosystèmes herbacés en régime stationnel, périodique, transitoire et mixte. Les AA. étudient les causes des variations des régimes, la relation entre les processus saisonniers
de production et de destruction et entre les cyclesducarbone, de l'azote et du phosphore. - (VVA)
Nécessité d'une analyse des causes des changements climatiques dans le contexte d'une interactivité de toutes les composantes du système climatique (incluant la biosphère et le cycleducarbone) et de la dynamique du développement socio-économique.
Atmosphere ; Biogeochemistry ; Carboncycle ; Climatic variation ; Cold area ; Geochemistry ; Organic materials ; Peat bog
The purpose of this paper is to discuss the processes involved in the exchange of carbon between the atmosphere and the organic deposits in peatlands. Particularly, the possible changes in the past in comparison with present-day conditions
Atmosphere ; Carboncycle ; Climatic warming ; Global change ; Model
Non seulement la concentration de CO2 dans l'atmosphère est un facteur clé contrôlant le changement climatique du XXIème siècle, mais le climat influence en retour le cycleducarbone et l'évolution du CO2 atmosphérique. Il subsiste toutefois une
assez grosse incertitude sur l'ampleur de cette rétroaction climat-carbone. - (JPB)
A simple linear response model describing the functional relationship between ocean carboncycle parameters and paleoclimate tracers (atmospheric pCO2, δ13C, CaCO3 saturation) was derived from a set of sensitivity experiments performed previously
using a three-dimensional carboncycle model. The linear model is optimally fitted to ice and marine sediment core records for the last 120,000 yr to estimate the carboncycle parameter changes that could have caused the observed reduction of atmospheric
Estimation of soil organic carbon reservoir in China
Carbone ; Changement global ; Chine ; Cycleducarbone ; Ecosystème ; Géochimie ; Matière organique ; Propriétés du sol ; Sol ; Système d'information géographique ; Variation spatiale
Carbon ; Carboncycle ; China ; Ecosystem ; Geochemistry ; Geographical information system ; Global change ; Organic materials ; Soil ; Soil properties ; Spatial variation
This paper uses measured data and the technique of geographical information system to calculate the terrestrial soil organic carbon reservoir, tries to analyze the spatial distribution characteristics of soil carbon reservoir and discusses the role
of soil organic carbon reservoir on the global change.
The carbon pools of biomass, littering, and SOC were studied with regards to carboncycles in epikarst zone, taking an example of Yaji Karst Experiment Site in Guilin. This study was focused on SOC and its lability, SOC decomposition rate, CO2
regime in the soils. This study was to elucidate the capacity of soil carbon driving for the epi-karstification and the significance of carbon transfer in carboncycles of karst system.
Après un bref rappel de quelques notions de base (types de végétation, bilan carboné des éco-systèmes, photosynthèse, respiration des plantes et des décomposeurs), l'A. s'interroge sur la réponse possible des arbres et des forêts à l'augmentation du
CO2 atmosphérique, puis pose la question de savoir si la végétation peut s'opposer au réchauffement global en fixant davantage de carbone. - (JPB)
L'objet de cette revue est de présenter la recherche actuelle concernant les facteurs qui influencent la dynamique ducarbone dans les forêts tropicales humides : mesures de terrain, écophysiologie, modélisation, télédétection.
On obtient des équations différentielles déterminant la teneur des isotopes ducarbone dans l'atmosphère par les valeurs des éjections de carbone fossile et de la biosphère. Les paramètres sont pris dans les données concernant la variation des
C 14 dating ; Carbon ; Carboncycle ; European part of Russia ; Flow ; Humus ; Palaeosol ; Soil
Des modèles de renouvellement ducarbone des sols d'après des données de carbone 14 sont utilisés pour évaluer les flux de carbonedu système sol-atmosphère aux niveaux local et régional. Etablissement des vitesses d'échange ducarbone et de leurs
Alberta ; Canada ; Carboncycle ; Climatic variation ; Ecosystem ; Global change ; Holocene ; Manitoba ; Palaeo-ecology ; Palaeobiogeography ; Palaeoclimate ; Peat bog ; Periodicity ; Saskatchewan
regulated western Canadian peatland initiation. Peatlands, the largest terrestrial carbon pool, and their carbon-budgets are sensitive to hydrological fluctuations. The AA. demonstrate that global carbon-budgets are sensitive to small climatic fluctuations
; thus international agrrements on greenhouse gasses need to take into account the natural carbon-budget imbalance of regions with large climatically sensitive carbon pools.
Atmospheric circulation ; Biogeography ; Carboncycle ; Carbon dioxide ; Climatic cooling ; Glacial features ; Holocene ; Interglacial ; Model ; Palaeoclimatology ; Peat bog
This paper focuses on the role of carbon accumulation in peatlands in lowering the concentration of CO2 in the atmosphere. The objective is to determine whether carbon models and proxy data for atmospheric CO2 are consistent with the hypothesis
that carbon accumulation in peatlands lowers atmospheric CO2, thus playing an important role in ice-age initiation.
Changes of forest biomass are estimated for time intervals 1860-1900, 1900-1950 and 1950-1980. The estimations are based on the inventory data of the world forest storage. Carboncycle modelling and a simple equation for mass balance of the stable
U3C isotope permitted to derive the value of planetary biomass changes using the data on the U3C/U2C ratio in tree rings. According to both methods the planetary biomass decreased during 1860-1980 about (30...60). 10U2 kg of carbon, while during 1956
-1980 not more than about (15...20).10U2 kg. The biospheric source of carbon had released about 1/3 to 1/2 of the amount of fossil fuel CO2 during the whole period of 120 years.
Urban carbon footprint and carboncycle pressure : The case study of Nanjing
Action anthropique ; Chine ; Chine de l'Est ; Cycleducarbone ; Développement durable ; Empreinte écologique ; Environnement ; Environnement urbain ; Modèle ; Nanjing ; Stratégie d'acteurs ; Utilisation du sol
Carboncycle ; China ; Decision making process ; Eastern China ; Ecological footprint ; Environment ; Human impact ; Land use ; Model ; Sustainable development ; Urban environment
Based on city level, this paper estimated carbon emissions and carbon footprint of Nanjing city, analyzed urban carbon footprint intensity and carboncycle pressure and discussed the influencing factors of carbon footprint through LMDI decomposition
model. The total carbon emissions and footprint of Nanjing increased rapidly since 2000. Economic development, population and industrial structure are promoting factors of carbon footprint of Nanjing, while the industrial carbon footprint intensity