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Full-Text Articles in Life Sciences
Prediction Of Leaf Area In Individual Leaves Of Cherrybark Oak Seedlings (Quercus Pagoda Raf.), Yanfei Guo, Brian Lockhart, John Hodges
Prediction Of Leaf Area In Individual Leaves Of Cherrybark Oak Seedlings (Quercus Pagoda Raf.), Yanfei Guo, Brian Lockhart, John Hodges
Journal of the Arkansas Academy of Science
The prediction of leaf area for cherrybark oak (Quercus pagoda Raf.) seedlings is important for studying the physiology of the species. Linear and polynomial models involving leaf length, width, fresh weight, dry weight, and internodal length were tested independently and collectively to predict leaf area. Twenty-nine cherrybark oak seedlings were grown in a greenhouse for one growing season and a total of 468 leaves were collected. Leaf area was polynomially related with leaf length or width, but linearly related with the cross product of length and width. Average leaf area for flush 3 was significantly greater than those of other …
Influence Of Pine Silvicultural Systems On Spider Population Diversity In Drew County, Arkansas, Holly Hill, Peggy Rae Dorris, Lynne C. Thompson
Influence Of Pine Silvicultural Systems On Spider Population Diversity In Drew County, Arkansas, Holly Hill, Peggy Rae Dorris, Lynne C. Thompson
Journal of the Arkansas Academy of Science
Spiders were collected by pit-trapping in southeastern Arkansas in 1984. Collection areas included two pine silvicultural treatments, clear-cutting and selection cutting; and control stands, where no cutting occurred. Spider populations decreased with increased disturbance.
Timber Felling Time, Costs, And Productivity In Arkansas, Richard A. Kluender, D. Lortz, W. Mccoy, B. Stokes, J. Klepac
Timber Felling Time, Costs, And Productivity In Arkansas, Richard A. Kluender, D. Lortz, W. Mccoy, B. Stokes, J. Klepac
Journal of the Arkansas Academy of Science
Sixteen stands were harvested by either clearcut, shelterwood, group selection, or single-tree selection methods. Harvest productivity was evaluated in four consecutive years (1991 through 1994). Three of the stands had uneven-aged structure, the other 13 were typical, mature, even-aged stands. Harvest intensity (proportion of basal area removed) ranged from 0.27 to 1.00. Logging contractors used one to three sawyers with production chain saws to fell trees on all 16 tracts. There was no statistical difference in production rate between sawyers on the same stand. Harvested sites were similar in slope, average diameter at breast height (DBH) and pre-harvest number of …
Conceptual Basis For An Index Of Forest Integrity For Upland Coastal Plain Ecosystems, Nicholas R. Brown, Brian Roy Lockhart, Philip A. Tappe, Lynne C. Thompson, Robert C. Weih Jr., Richard A. Williams
Conceptual Basis For An Index Of Forest Integrity For Upland Coastal Plain Ecosystems, Nicholas R. Brown, Brian Roy Lockhart, Philip A. Tappe, Lynne C. Thompson, Robert C. Weih Jr., Richard A. Williams
Journal of the Arkansas Academy of Science
Following the recent trend to manage natural resources for "sustainability," ecologists, resource managers and policymakers are beginning to think of the management of forest ecosystems in terms of "ecosystem health" or "ecosystem integrity." Biologists are increasingly recognizing that use of chemical assays in assessing the condition of an ecosystem has limited value, and that biological factors, e.g., species diversity and composition, can be useful characters in the analysis of "biotic integrity." An index of biotic integrity (IBI) has been developed for riverine ecosystems in the Midwest U.S., using fish species diversity, indicator population analysis, trophic structure assessment, and physiological abnormalities …