搜索结果: 16-30 共查到“地球科学总论 the forest”相关记录49条 . 查询时间(0.217 秒)
Basin-wide variations in foliar properties of Amazonian forest:phylogeny,soils and climate
Basin-wide variations foliar properties Amazonian forest phylogeny soils climate
2010/1/21
We analysed 1040 individual trees, located in 62 plots across the Amazon Basin for leaf mass per unit area (MA), foliar carbon isotopic composition (δ13C) and leaf level concentrations of C, N, P, Ca,...
Photosynthesis of boreal ground vegetation after a forest clear-cut
Photosynthesis boreal ground vegetation forest clear-cut
2010/1/21
Heather (Calluna vulgaris), rosebay willowherb (Epilobium angustifolium), wavy hair-grass (Deschampsia flexuosa) and raspberry (Rubus idaeus) are typical species at boreal clear-cut sites. In this stu...
Response of Forest to Climatic Events and Human Management at Fort Leavenworth,Kansas
Response of Forest Climatic Events Human Management
2009/10/20
Characteristics and temporal changes in forest cover from 1987 to 1997 were documented on the basis of remote sensing for two study forests at Fort Leavenworth, northeastern Kansas. Eight Landsat 5 Th...
Liana infestation impacts tree growth in a lowland tropical moist forest
Liana infestation tree growth lowland tropical moist forest
2010/1/21
Ecosystem-level estimates of the effect of lianas on tree growth in mature tropical forests are needed to evaluate the functional impact of lianas and their potential to affect the ability of tropical...
Forest floor carbon exchange of a boreal black spruce forest in eastern North America
Forest floor carbon exchange boreal black spruce forest eastern North America
2010/1/21
This study reports continuous automated measurements of forest floor carbon (C) exchange over feathermoss, lichen, and sphagnum micro-sites in a black spruce forest in eastern North America during sno...
Applying biomass and stem fluxes to quantify temporal and spatial fluctuations of an old-growth forest in disturbance
biomass stem fluxes temporal and spatial fluctuations old-growth forest
2010/1/21
A subtropical old-growth forest was studied over a twelve-year period to investigate temporal and spatial fluctuations of biomass and stem fluxes under disturbances. Vegetations were categorized into ...
Spatial distribution and functional significance of leaf lamina shape in Amazonian forest trees
Spatial distribution functional significance leaf lamina shape Amazonian forest trees
2010/1/20
Leaves in tropical forests come in an enormous variety of sizes and shapes, each of which can be ultimately viewed as an adaptation to the complex problem of optimising the capture of light for photos...
Soil,plant,and transport influences on methane in a subalpine forest under high ultraviolet irradiance
Soil plant transport influences methane subalpine forest high ultraviolet irradiance
2010/1/20
Recent studies have demonstrated direct methane emission from plant foliage under aerobic conditions, particularly under high ultraviolet (UV) irradiance. We examined the potential importance of this ...
Modelling basin-wide variations in Amazon forest productivity – Part 1:Model calibration,evaluation and upscaling functions for canopy photosynthesis
basin-wide variations Amazon forest productivity Model calibration evaluation
2010/1/20
Given the importance of Amazon rainforest in the global carbon and hydrological cycles, there is a need to parameterize and validate ecosystem gas exchange and vegetation models for this region in ord...
Mercury concentrations and pools in four Sierra Nevada forest sites,and relationships to organic carbon and nitrogen
Mercury concentrations pools Sierra Nevada forest sites organic carbon nitrogen
2010/1/20
This study presents data on mercury (Hg) concentrations, stochiometric relations to carbon (C) and nitrogen (N), and Hg pool sizes in four Sierra Nevada forest sites of similar exposure and precipitat...
CO2 enrichment increases nutrient leaching from model forest ecosystems in subtropical China
CO2 enrichment nutrient leaching model forest ecosystems subtropical China
2010/1/18
The effect of high atmospheric CO2 concentrations on the dynamics of mineral nutrient is not well documented, especially for subtropical China. We used model forest ecosystems in open-top chambers to ...
Assessing seasonality of biochemical CO2 exchange model parameters from micrometeorological flux observations at boreal coniferous forest
seasonality biochemical CO2 exchange model parameters micrometeorological flux observations
2010/1/18
The seasonality of the NEE of the northern boreal coniferous forests was investigated by means of inversion modelling using eddy covariance data. Eddy covariance data was used to optimize the biochemi...
Plant physiological and environmental controls over the exchange of acetaldehyde between forest canopies and the atmosphere
physiological and environmental controls exchange forest canopies atmosphere
2010/1/18
We quantified fine scale sources and sinks of gas phase acetaldehyde in two forested ecosystems in the US. During the daytime, the upper canopy behaved as a net source while at lower heights, reduced ...
Storm damage in the Black Forest caused by the winter storm
Storm damage the Black Forest the winter storm
2009/12/30
An airborne survey of the Black Forest as affected by the winter storm "Lothar" in 1999 is performed by means of a color line scanner (CLS) with a CCD sensor, whose data in a visible and a near-infrar...
Towards operational remote sensing of forest carbon balance across Northern Europe
operational remote sensing forest carbon balance Northern Europe
2010/1/15
Monthly averages of ecosystem respiration (ER), gross primary production (GPP) and net ecosystem exchange (NEE) over Scandinavian forest sites were estimated using regression models driven by air temp...