Showing papers in "Agricultural and Forest Meteorology in 2006"

TL;DR: In this article, a procedure that calibrates both the frequency and the intensity distribution of daily GCM rainfall relative to a target station, and demonstrate its application to maize yield simulation at a location in semi-arid Kenya is presented.

TL;DR: Changes in the timing and length of the growing season may not only have far reaching consequences for plant and animal ecosystems, but persistent increases in GSL may lead to long-term increases in carbon storage and changes in vegetation cover which may affect the climate system.

TL;DR: In this article, the authors synthesized crop and climate data from representative stations across China during 1981-2000 to investigate whether there were significant trends in changes of climate variables in different regions, and whether theses changes have had significant impact on the development and production of the staple crops (i.e., rice, wheat, and maize).

TL;DR: In this article, the authors used data from seven sites in the AmeriFlux network, including five forested sites, one grassland site, and one agricultural site, to conduct a cross-site analysis of random flux error.

TL;DR: In this paper, the adverse effects of elevated temperature on reproductive processes and yield of grain-sorghum were more severe at elevated CO2 than at ambient CO2; and the beneficial effects of increased CO2 decreased with increasing temperature.

TL;DR: In this paper, the authors compared 12 variations of regression-based and weighted-average approaches for interpolating daily maximum and minimum temperatures over British Columbia, Canada, a domain with complex topography and highly variable density and elevational distribution of climate stations.

TL;DR: The Chinese Terrestrial Ecosystem Flux Research Network (ChinaFLUX) is a long-term national network of micrometeorological flux measurement sites that measure the net exchange of carbon dioxide, water vapor, and energy between the biosphere and atmosphere.

TL;DR: In this article, the Boreal Ecosystem Research and Monitoring Sites (BERMS) in central Saskatchewan, Canada were used for measuring carbon fluxes to boreal forest stands between 10 and 50 years of age.

TL;DR: In this paper, the effective leaf area index (LAI) measurements made at 17 forest sites of the Fluxnet Canada Research Network are reported, and a procedure is suggested for using the effective LAI for estimating FPAR at various times of the day and year.

TL;DR: In this article, the authors assessed the successional development of above-and belowground ecosystem biomass and carbon (C) pools in an age-sequence of four White pine plantation stands (2-, 15-, 30-, and 65-year-old) in Southern Ontario, Canada.

TL;DR: In this article, the authors developed a model to estimate solar radiation from sunshine duration, which is more accurate and more general than traditional Angstrom-Prescott models and can explicitly account for radiative extinction processes in the atmosphere.

TL;DR: In this article, the authors used continuous half-hourly measurements of soil CO2 efflux made between January and December 2001 in a mature trembling aspen stand located at the southern edge of the boreal forest in Canada were used to investigate the seasonal and diurnal dependence of soil respiration (Rs) on soil temperature (Ts) and water content (θ).

TL;DR: This article evaluated the impact of climate change on six major perennial crops in California: wine grapes, almonds, table grapes, oranges, walnuts, avocados, and table grapes.

TL;DR: In this article, the authors analyzed 5 years of EC carbon dioxide, water vapor, and sensible heat flux measurements from three mature boreal forest stands in central Saskatchewan, Canada, and derived an analogous FNEE ''closure fraction'' CF NEE by normalizing measured FNEE against estimates from an empirical model.

TL;DR: This paper evaluated the impact of climate change on six major perennial crops in California: wine grapes, almonds, table grapes, oranges, walnuts, avocados, and table grapes.

TL;DR: In this article, the results of a maize/peanut intercrop study were presented, which indicated that a maize and peanut intercropping would help to increase production through the efficient utilisation of solar energy.

TL;DR: In this article, the relative roles of stand age and associated structural characteristics and weather variability on the exchange of carbon dioxide between the atmosphere and three different coastal Douglas-fir stands at different stages of development after clearcut harvesting were examined.

TL;DR: This article measured net ecosystem CO2 exchange (NEE) using the eddy covariance (EC) technique for 4 years at adjoining old field (OF), planted pine (PP) and hardwood forest (HW) ecosystems in the Duke Forest, NC.

TL;DR: In this paper, the authors synthesize energy balance measures from 22 sites in Alaska, Saskatchewan and Manitoba collected between 1998 and 2004 for a 150-year boreal forest chronosequence.

TL;DR: In this article, the interannual and seasonal variability of gross ecosystem photosynthesis (P), ecosystem respiration (R) and evapotranspiration (E), and their relationships to environmental factors were used to explain changes in net ecosystem productivity (F NEP) at the onset of, during, and following a 3-year-long (2001-2003) drought in a mature boreal aspen stand in central Saskatchewan, Canada.

TL;DR: In this paper, the ANUSPLIN software package is used to generate spatially continuous climate surfaces from noisy weather station data, and the results of an intensive modelling effort that generated 100 years (1901-2000) of monthly precipitation and minimum and maximum temperature grids for Canada and the United States are presented.

TL;DR: In this article, an investigation of the detection of water stress in nonhomogeneous crop canopies such as orchards using high-spatial resolution remote sensing thermal imagery is presented.

TL;DR: In this paper, the response of CO2 fluxes to climatic and non-climatic variables was analyzed and the evolution of assimilation and respiration throughout the growing season was studied.

TL;DR: In this article, the authors investigated the influence of a geometric laser measurement pattern and shadow effect on the accuracy of a quantitative mathematical description of individual tree structure using a terrestrial laser system.

TL;DR: In this article, an improved method of correcting for the angle of attack error resulting from the imperfect (co)sine response of ultrasonic anemometers is proposed, which is robustly and adequately fast for practical use in calculating eddy fluxes.

TL;DR: In this article, the effect of soil water content on the Q10 value of ecosystem respiration is described best by a quadratic function, instead of the commonly used multiplicative model.

TL;DR: In this article, the Boreal Ecosystem Productivity Simulator (BEPS) model was run to simulate an aspen forest in Saskatchewan, Canada during the period 1997-2004, and two model simulations were conducted to test two hypotheses: (i) carbon and energy exchanges between terrestrial ecosystems and the atmosphere are closely constrained by soil water availability, and (ii) vegetation is able to optimize soil water uptake from different soil layers.

TL;DR: In this article, the authors used temperature microloggers to measure the temperature throughout a year on the northern and southern slopes of Mt. Taibai (3767m a.s.l.).

TL;DR: In this article, the authors present a procedure for estimating daily global solar radiation for inclined surfaces having specified slope and aspect for application with surface energy balance models for determining evapotranspiration.

TL;DR: In this paper, several well-known parameterisations for clear-sky and cloudy-sky downward longwave radiation were tested for an experimental site at Ponta Grossa (Parana State, Brazil) where all radiation components and meteorological data were measured during 279 days in spring, summer, fall and winter (2003/2004).