caa a22 4500 397572158 CHVBK 20180308164844.0 cr unu---uuuuu 161202e19960601xx s 000 0 eng 10.1093/ee/25.3.632 doi (NATIONALLICENCE)oxford-10.1093/ee/25.3.632 Artificial Defoliation Effect on Populus Growth, Biomass Production, and Total Nonstructural Carbohydrate Concentration [Elektronische Daten] [Ryan R. Reichenbacker, Richard C. Schultz, Elwood R. Hart] The impact of artificial defoliation on Populus growth,biomass production, and total nonstructural carbohydrate concentration was examined. Four Populus clones were field planted and artificially defoliated. Assigned defoliation levels (0, 25, 50, or 75%) were applied to leaves of leaf plastochron index 0 through 8 during a 6-d period in a 3-step incremental manner to simulate cottonwood leaf beetle, Chrysomela scripta F., larval feeding patterns. Artificial defoliations were timed to coincide with the outbreaks of natural beetle populations in adjacent areas. After 2 growing seasons, trees were measured for height, diameter, and biomass accumulation. Root samples were collected from 0 and 75% defoliation treatments and analyzed for total nonstructural carbohydrate content. Height, diameter, and above ground biomass decreased significantly with increasing defoliation for all clones. There was a significant difference in root and total biomass between 0 and 75% defoliation treatments for each clone. Biomass was reduced an average of 33% as defoliation level increased from 0 to 75%, As defoliation level increased from 0 to 75%, a consistent allocation ratio of biomass to ⅔ above and ⅓ below ground components continued in all clones. An overcompensation response occurred in above ground biomass when a defoliation level of 25% was applied. Between 25 and 75% a strong linear trend of decreasing biomass as defoliation increased was indicated. Vitality of the tree, as indicated by total nonstructural carbohydrate content, was affected only slightly by increasing defoliation. © 1996 Entomological Society of America Population Ecolocy nationallicence Chrysomela scripta nationallicence Populus nationallicence defoliation nationallicence biomass nationallicence herbivory nationallicence Reichenbacker Ryan R. Department of Entomology, Iowa State University, Ames, IA 5001l aut Schultz Richard C. Department of Forestry, Iowa State University, Ames, IA 50011 aut Hart Elwood R. Department of Entomology, Iowa State University, Ames, IA 5001l aut Environmental Entomology Oxford University Press 25/3(1996-06-01), 632-642 0046-225X 25:3<632 1996 25 ee https://doi.org/10.1093/ee/25.3.632 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/ee/25.3.632 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Reichenbacker Ryan R. Department of Entomology, Iowa State University, Ames, IA 5001l aut NATIONALLICENCE 700 1- Schultz Richard C. Department of Forestry, Iowa State University, Ames, IA 50011 aut NATIONALLICENCE 700 1- Hart Elwood R. Department of Entomology, Iowa State University, Ames, IA 5001l aut NATIONALLICENCE 773 0- Environmental Entomology Oxford University Press 25/3(1996-06-01), 632-642 0046-225X 25:3<632 1996 25 ee Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford