Climatic variation ; Environment ; Global change ; Holocene ; Human impact ; Ice core ; Impact ; Isotope analysis ; Landscape ; Perception ; Photography ; Pollen diagram ; Texas ; United States of America
This paper explores the commonly negative human reaction to environmental change. First, it assesses landscape change, defined specifically as the modification of land cover characteristics in the United States over the last couple of decades
. Second, the paper describes global change, the human modification of major natural processes, again largely over the previous several decades. Third, the paper portrays the writing of Texas naturalist Roy Bedichek as a more positive human response
Complex responses to global change at alpine treeline
Environmental change and physical geography
Changement global ; Dendroclimatologie ; Ecotone ; Etats-Unis ; Limite supérieure de la forêt ; Montagne ; Rocky Mountains ; Simulation ; Variation climatique ; Variation spatiale ; Végétation
Climatic variation ; Dendroclimatology ; Ecotone ; Global change ; Mountain ; Rocky Mountains ; Simulation ; Spatial variation ; Tree line ; United States of America ; Vegetation
Global change is complex in 2 senses. First, multiple interactions are involved. Second, the interactions include nonlinear relations. Most interesting problems in physical geography are so constructed. In this paper, the A. examines some
of the consequences of nonlinear relations in the response of the alpine treeline to ecotone to global climatic change.
Environmental change in Glacier National Park, Montana : an assessment through repeat photography from fire lookouts
Environmental change and physical geography
This paper describes a largely unrecognized source of panoramic photographs from the 1930s for fire lookouts in the American West, and uses a set of those photographs from Glacier National Park (GNP), to illustrate landscape changes through
rephotography. The AA. rephotographed 360° panoramas from 9 of the same fire lookouts and qualitatively and quantitatively compared the nature and amount of landscape change from 1935 to the late 1990s. Geomorphic changes in general were less distinct than
This paper is concerned with qualitative rather than quantitative unpredictability. For example, rather than a concern with estimating runoff volumes or peak flows associated with land use change, the issue is whether runoff will increase, decrease
In order to evaluate soil-nutrient changes, 124 samples in surface soil were collected in a 416.16 km2 plain region in Zunhua County of Hebei province in 1999 and compared to 1980 results from the Second National Soil Survey. The average contents