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Article
Establishment and growth of piñon pine regeneration vary by nurse type along a soil substrate age gradient in northern Arizona.
Journal of Arid Environments (2015)
  • Dr Jeffrey M Kane, Humboldt State University
  • Frank L Dugi, Navajo Technical College
  • Thomas E Kolb, Northern Arizona University
Abstract
Future climate predictions suggest that recent patterns of increased pi~ non pine (Pinus edulis) mortality related to drought in the southwestern U.S. will continue. However, the importance of facilitation for young pi~ non pine growing at different edaphic sites is not well understood. We measured the density and stem elongation of juvenile pi~ non pine that established under nurse plants or in open areas in northern Arizona, USA that ranged in soil substrate age from 0.93 to 750 ky. We found: 1) 4e9 times greater juvenile pi~ non pine density under nurse plants compared to open areas; 2) 1e2 times greater densities at the two older substrate sites compared to the younger substrate site; 3) nurse plant effects on juvenile pi~ non density changed with substrate age; 4) 14e19% greater growth in nursed conditions than open areas across all substrate ages; 5) 32e35% greater growth at the two older substrate age sites; and 6) growth beneath dead pi~ non nurse plants were approximately 20% greater than under live pi~ non nurse plants, though differences were not statistically significant (P ¼ 0.07). As a result, we propose that projections of pi~ non pine distributions need to consider influences of edaphic conditions and the abundance and types of nurse plants on regeneration. 
Keywords
  • Climate change,
  • Facilitation,
  • Juniperus monosperma,
  • Semi-arid woodland,
  • Stress-gradient hypothesis
Publication Date
January, 2015
DOI
10.1016/j.jaridenv.2015.01.011
Citation Information
Jeffrey M Kane, Frank L Dugi and Thomas E Kolb. "Establishment and growth of piñon pine regeneration vary by nurse type along a soil substrate age gradient in northern Arizona." Journal of Arid Environments (2015)
Available at: http://works.bepress.com/jeffrey-kane/3/