Plasticity in leaf-level water relations of tropical rainforest trees in response to experimental drought.

The tropics are predicted to become warmer and drier, and understanding the sensitivity of tree species to drought is important for characterizing the risk to forests of climate change. This study makes use of a long-term drought experiment in the Amazon rainforest to evaluate the role of leaf-level water relations, leaf anatomy and their plasticity in response to drought in six tree genera. The variables (osmotic potential at full turgor, turgor loss point, capacitance, elastic modulus, relative water content and saturated water content) were compared between seasons and between plots (control and through-fall exclusion) enabling a comparison between short- and long-term plasticity in traits. Leaf anatomical traits were correlated with water relation parameters to determine whether water relations differed among tissues. The key findings were: osmotic adjustment occurred in response to the long-term drought treatment; species resistant to drought stress showed less osmotic adjustment than drought-sensitive species; and water relation traits were correlated with tissue properties, especially the thickness of the abaxial epidermis and the spongy mesophyll. These findings demonstrate that cell-level water relation traits can acclimate to long-term water stress, and highlight the limitations of extrapolating the results of short-term studies to temporal scales associated with climate change.

The Los Alamos General Circulation Model hydrologic cycle

As the global population has increased, so have human influences on the global environment. ... How can we better understand and predict these natural and potential anthropogenic variations? One way is to develop a model that can accurately describe all the components of the hydrologic cycle, rather than just the end result variables such as precipitation and soil moisture. If we can predict and simulate variations in evaporation and moisture convergence, as well as precipitation, then we will have greater confidence in our ability to at least model precipitation variations. Therefore, we describe here just how well we can model relevant aspects of the global hydrologic cycle. In particular, we determine how well we can model the annual and seasonal mean global precipitation, evaporation, and atmospheric water vapor transport.

España y los Institutos : National Defense Education Act.

La educación es utilizada por todas las naciones, sin distinción, para dar a conocer los grandes avances técnicos, y sensibilizar sobre su capacidad destructiva, sobre todo la de los descubrimientos bélicos. Además el dominio de una nación sobre las otras ya no se va a fundamentar en grandes conquistas bélicas, sino en la capacidad tecnológica superior de unas naciones respecto a otras. De este modo tras el lanzamiento del Sputnik por parte de Rusia, Estados Unidos se lanza a dar un apoyo sin precedentes a sus programas educativos. Con este espíritu se promulga la National Defense Education Act, que firma Einsenhower en 1958. La ley está compuesta por diez apartados. Se analizan en profundidad los apartados de esta ley y su influencia en los institutos norteamericanos.

USLE and WEPP Soil Erosion Models: Their Applicability and Use in Generating Cover Values to Stabilize Soil in the Los Alamos, New Mexico Area

Soil erosion is a naturally occurring process that involves the detachment, transport, and deposition of soil particles. Disturbances such as thinning and wildfire can reduce cover greatly and increase erosion rates. Forest managers may use erosion prediction tools, such as the Universal Soil Loss Equation (USLE) and Water Erosion Prediction Project (WEPP) to estimate erosion rates and develop techniques to manage erosion. However, it is important to understand the differences and the applications of each model. Erosion rates were generated by each model and the model most applicable to the study site, Los Alamos, New Mexico was determined. It was also used to find the amount of cover needed to stabilize soil. The USLE is a simpler model and less complicated than a computer model like WEPP, and thus easier to manipulate to estimate cover values. Predicted cover values were compared to field cover values. Cover is necessary to establish effective erosion control guidelines.

Final environmental impact statement : land management plans : Angeles National Forest, Cleveland National Forest, Los Padres National Forest, San Bernardino National Forest.

Mode of access: Internet.

Introduction to quantum mechanics : a course at Los Alamos University /

Mode of access: Internet.

Evaluation of environmental control technologies for magnetic fields /

August 1978.

Institutional constraints on alternative water for energy : a guidebook for regional assessments /

"DOE/EV/10180-01."

Oil and gas lease applications of the Los Padres National Forest : draft environmental assessment.

"Los Padres National Forest."