Title: Spatial patterns of longleaf pine (Pinus palustris) seedling eastablishment on the croatan national forest, North Carolina
Author: Avery, Chadwick R.; Cohen, Susan; Parker, Kathleen C.; Kush, John S.;
Source: Journal of the North Carolina Academy of Science, 120(4), 2004, pp. 131-142
Publication Series: Miscellaneous Publication
Description: Ecological research aimed at determining optimal conditions for longleaf pine regeneration has become increasingly important in efforts @ restore the longleaf pine ecosystem. Numerous authors have concluded that a negative relationship exists between the occurrence of seedlings and the occurrence of mature trees; however, observed field conditions in several North Carolina Coastal Plain sites suggested otherwise. Second growth stands in the Croatan National Forest, North Carolina were examined to further elucidate spatial relationships between longleaf pine seedlings and mature trees. Specific questions addressed were I) Does the spatial pattern of stems depart from random for either mature trees or seedlings, 2) Is there a spatial association between ]nature trees and seedlings, and 3) Does a relationship exist between the occurrence of mature trees and underground or surface resources (i.e., carbon and nitrogen content and litter biomass) or root biomass. Ripley's univariate L(t)-statistic was used to test whether the spatial pattern of stems departed from random. Ripley's second order statistic was used to determine whether a significant relationship existed between mature trees and seedlings. Generally, qeedlings were found to be aggregated. but no significant spatial relationship was found between seedlings and mature trees. The most significant influence of mature trees on seedlings may be increased litter accumulation in close proximity to trees, which can adversely affect seedling survival by increasing fire intensity.
Keywords: Longleaf pine, regeneration, Ripley statistic, North Carolina, coastal plain
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Avery, Chadwick R.; Cohen, Susan; Parker, Kathleen C.; Kush, John S. 2004. Spatial patterns of longleaf pine (Pinus palustris) seedling eastablishment on the croatan national forest, North Carolina. Journal of the North Carolina Academy of Science, 120(4), 2004, pp. 131-142
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