搜索结果: 106-120 共查到“理学 ecosystem”相关记录189条 . 查询时间(0.09 秒)
Features of Lake Takkobu ecosystem assessed by natural abundance of 13C and 15N
Kushiro Moor lake ecosystem
2009/4/1
southern part. Seasonally, POM with high δ13C and low δ15N has appeared in summer, whereas the opposite is the case in spring and autumn. Horizontally, the summer POM with both higher δ13C and lower δ...
The use of disjunct eddy sampling methods for the determination of ecosystem level fluxes of trace gases
disjunct eddy sampling methods ecosystem level fluxes trace gases
2009/3/13
The concept of disjunct eddy sampling (DES) for use in measuring ecosystem-level micrometeorological fluxes is re-examined. The governing equations are discussed as well as other practical considerati...
The interannual variability of Africa's ecosystem productivity:a multi-model analysis
interannual variability Africa's ecosystem productivity multi-model analysis
2010/1/19
We are comparing spatially explicit process-model based estimates of the terrestrial carbon balance and its components over Africa and confront them with remote sensing based proxies of vegetation pro...
Drivers of inter-annual variability in Net Ecosystem Exchange in a semi-arid savanna ecosystem,South Africa
inter-annual variability Net Ecosystem Exchange semi-arid savanna ecosystem
2010/1/19
Inter-annual variability in primary production and ecosystem respiration was explored using eddy-covariance data at a semi-arid savanna site in the Kruger Park, South Africa. New methods of extrapolat...
Historical and simulated ecosystem carbon dynamics in Ghana:land use,management,and climate
Historical and simulated ecosystem carbon dynamics land use management climate
2010/1/19
We used the General Ensemble biogeochemical Modeling System (GEMS) to simulate responses of natural and managed ecosystems to changes in land use and land cover, management, and climate for a forest/s...
Response of carbon fluxes to water relations in a savanna ecosystem in South Africa
Response carbon fluxes water relations savanna ecosystem South Africa
2010/1/18
The principal mechanisms that connect carbon fluxes with water relations in savanna ecosystems were studied by using eddy covariance method in a savanna ecosystem at Kruger National Park, South Africa...
Process-based estimates of terrestrial ecosystem isoprene emissions: incorporating the effects of a direct CO2-isoprene interaction
terrestrial ecosystem isoprene emissions CO2-isoprene
2008/11/27
In recent years evidence has emerged that the amount of isoprene emitted from a leaf is affected by the CO2 growth environment. Many – though not all – laboratory experiments indicate that emissions i...
Exploring riverine zooplankton in three habitats of the Illinois River ecosystem: Where do they come from?
Exploring riverine zooplankton in three habitats the Illinois River ecosystem Where do they come from?
2014/4/21
We sampled three habitats (main channel, side channels, and backwater lakes) during 2 yr along 32 km of the Illinois River to compare zooplankton distribution and dynamics, as well as evaluate the pos...
Marine ecosystem community carbon and nutrient uptake stoichiometry under varying ocean acidification during the PeECE III experiment
Marine ecosystem community carbon nutrient uptake stoichiometry ocean acidification
2010/1/18
Changes to seawater inorganic carbon and nutrient concentrations in response to the deliberate CO2 perturbation of natural plankton assemblages were studied during the 2005 Pelagic Ecosystem CO2 Enric...
Chemical sensing of plant stress at the ecosystem scale
Chemical sensing plant stress ecosystem scale
2010/1/18
Significant ecosystem-scale emissions of methylsalicylate (MeSA), a semivolatile plant hormone thought to act as the mobile signal for systemic acquired resistance (SAR), were observed in an agrofores...
Recognition of Ecosystem Response to Climate Change Impact
climate change adaptation threshold ecosystem China
2008/7/6
Observed global warming has impacted on ecosystems directly and indirectly. Governments, enterprises and common
people in the world pay attention to the climate change of mainly global warming. Gener...
Predicting the global distribution of planktonic foraminifera using a dynamic ecosystem model
global distribution planktonic foraminifera dynamic ecosystem model
2010/1/15
We present a new planktonic foraminifera model developed for the global ocean mixed-layer. The main purpose of the model is to explore the response of planktonic foraminifera to different boundary con...
Implications of CO2 pooling on δ13C of ecosystem respiration and leaves in Amazonian forest
Implications CO2 δ13C ecosystem respiration Amazonian forest
2010/1/15
The carbon isotope of a leaf (δ13Cleaf) is generally more negative in riparian zones than in areas with low soil moisture content or rainfall input. In Central Amazonia, the small-scale topography is ...
Sensitivity of sea-to-air CO2 flux to ecosystem parameters from an adjoint model
Sensitivity sea-to-air CO2 flux ecosystem parameters adjoint model
2010/1/15
An adjoint model is applied to examine the biophysical factors that control surface pCO2 in different ocean regions. In the tropical Atlantic and Indian Oceans, the annual cycle of pCO2 in the model i...
A framework for developing ecosystem-specific nutrient criteria: Integrating biological thresholds with predictive modeling
ecosystem-specific nutrient criteria Integrating biological thresholds predictive modeling
2014/4/21
We present a novel ecosystem-specific framework for developing nutrientcriteria from biological thresholds and predictive modeling (BTPM) and an application of this framework to lakes in Michigan, U.S...