搜索结果: 1-15 共查到“地球科学总论 grassland”相关记录20条 . 查询时间(0.062 秒)
Grassland production under global change scenarios for New Zealand pastoral agriculture
Grassland production global change scenarios
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2014/12/19
We adapt and integrate the Biome-BGC and Land
Use in Rural New Zealand models to simulate pastoral agriculture and to make land-use change, intensification of agricultural activity and climate ...
"Processes controlling the exchange of ammonia between grassland and the atmosphere (GRAMINAE) – results from the Braunschweig field experiment"
ammonia grassland and the atmosphere the Braunschweig field experiment
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2010/1/21
"Processes controlling the exchange of ammonia between grassland and the atmosphere (GRAMINAE) – results from the Braunschweig field experiment".
Dynamics of ammonia exchange with cut grassland: synthesis of results and conclusions of the GRAMINAE Integrated Experiment
ammonia exchange cut grassland the GRAMINAE Integrated Experiment
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2010/1/21
Improved data on biosphere-atmosphere exchange are fundamental to understanding the production and fate of ammonia (NH3) in the atmosphere. The GRAMINAE Integrated Experiment combined novel measuremen...
Environmental influences on carbon dioxide fluxes over three grassland ecosystems in China
Environmental influences carbon dioxide three grassland ecosystems China
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2010/1/21
This study compared carbon dioxide (CO2) fluxes over three grassland ecosystems in China, including a temperate semiarid steppe in Inner Mongolia (NMG), an alpine shrub-meadow in Qinghai (HB), and an ...
Measurement and modelling ozone fluxes over a cut and fertilized grassland
Measurement modelling ozone fluxes cut fertilized grassland
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2010/1/21
During the GRAMINAE Integrated Experiment between 20 May and 15 June 2000, the ozone flux was measured by the eddy covariance method above intensively managed grassland in Braunschweig, northern Germa...
Ammonia sources and sinks in an intensively managed grassland canopy
Ammonia sources sinks grassland canopy
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2010/1/21
Grasslands represent canopies with a complex structure where sources and sinks of ammonia (NH3) may coexist at the plant level. Moreover, management practices such as mowing, hay production and grazin...
Aerosol fluxes and particle growth above managed grassland
Aerosol fluxes particle growth managed grassland
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2010/1/20
Particle deposition velocities (11–3000 nm diameter) measured above grassland by eddy covariance during the EU GRAMINAE experiment in June 2000 averaged 0.24 and 0.03 mm s−1 to long (0.75 m) and...
Intercomparison and assessment of turbulent and physiological exchange parameters of grassland
Intercomparison assessment turbulent and physiological exchange parameters grassland
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2010/1/20
Commonly, the micrometeorological parameters that underline the calculations of surface atmosphere exchange fluxes (e.g. friction velocity and sensible heat flux) and parameters used to model exchange...
Turbulence characteristics in grassland canopies and implications for tracer transport
Turbulence characteristics grassland canopies implications tracer transport
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2010/1/20
In-canopy turbulence is a required input to study pollutant cycling and chemistry within plant canopies and to link concentrations and sources. Despite the importance of grasslands worldwide, most pre...
Ammonia fluxes in relation to cutting and fertilization of an intensively managed grassland derived from an inter-comparison of gradient measurements
Ammonia fluxes cutting fertilization grassland inter-comparison gradient measurements
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2010/1/20
Quantification of ammonia (NH3) land-atmosphere exchange is required for atmospheric modelling and assessment of nitrogen deposition, yet flux measurement methods remain highly uncertain. To address t...
An automated dynamic chamber system for surface exchange measurement of non-reactive and reactive trace gases of grassland ecosystems
dynamic chamber system surface exchange measurement grassland ecosystems
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2010/1/19
We present an automated dynamic chamber system which is optimised for continuous unattended flux measurements of multiple non-reactive and reactive trace gases on grassland ecosystems. Main design fea...
Dynamics of ammonia exchange with cut grassland:strategy and implementation of the GRAMINAE Integrated Experiment
Dynamics ammonia exchange cut grassland strategy implementation GRAMINAE Integrated Experiment
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2010/1/19
A major international experiment on ammonia (NH3) biosphere-atmosphere exchange was conducted over intensively managed grassland at Braunschweig, Germany. The experimental strategy was developed to al...
Temporal variability in bioassays of the stomatal ammonia compensation point in relation to plant and soil nitrogen parameters in intensively managed grassland
Temporal variability stomatal ammonia compensation point plant and soil nitrogen parameters
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2010/1/19
The exchange of ammonia between crop canopies and the atmosphere depends on a range of plant parameters and climatic conditions. However, little is known about effects of management factors. We have h...
Modelling the dynamic chemical interactions of atmospheric ammonia with leaf surface wetness in a managed grassland canopy
dynamic chemical interactions atmospheric ammonia leaf surface wetness grassland canopy
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2010/1/19
Ammonia exchange fluxes between grassland and the atmosphere were modelled on the basis of stomatal compensation points and leaf surface chemistry, and compared with measured fluxes during the GRAMINA...
Contribution of different grass species to plant-atmosphere ammonia exchange in intensively managed grassland
Contribution grass species plant-atmosphere ammonia exchange grassland
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2010/1/19
Species diversity in grasslands usually declines with increasing input of nitrogen from fertilizers or atmospheric deposition. Conversely, species diversity may also impact the build-up of soil and pl...