Primary Succession on a Hawaiian Dryland Chronosequence
| Autor: | Ty Kennedy-Bowdoin, Gregory P. Asner, James R. Kellner, Sara C. Hotchkiss, Kealohanuiopuna Kinney, Oliver A. Chadwick, Katherine Heckman, Marjeta Jeraj, Erin J. Questad, Susan Cordell, Jarrod M. Thaxton, David E. Knapp, Frank A. Trusdell |
|---|---|
| Přispěvatelé: | Zang, Runguo |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Multidisciplinary
biology ved/biology Ecology General Science & Technology Chronosequence lcsh:R Dodonaea viscosa ved/biology.organism_classification_rank.species Myoporum sandwicense lcsh:Medicine Metrosideros polymorpha Ecological succession biology.organism_classification Shrub Hawaii Botany lcsh:Q lcsh:Science Sophora chrysophylla Primary succession Ecosystem Research Article |
| Zdroj: | PLoS ONE PloS one, vol 10, iss 6 PLoS ONE, Vol 10, Iss 6, p e0123995 (2015) Kinney, KM; Asner, GP; Cordell, S; Chadwick, OA; Heckman, K; Hotchkiss, S; et al.(2015). Primary succession on a Hawaiian dryland chronosequence. PLoS ONE, 10(6). doi: 10.1371/journal.pone.0123995. UC Santa Barbara: Retrieved from: http://www.escholarship.org/uc/item/60k69468 |
| ISSN: | 1932-6203 |
| DOI: | 10.1371/journal.pone.0123995. |
| Popis: | We used measurements from airborne imaging spectroscopy and LiDAR to quantify the biophysical structure and composition of vegetation on a dryland substrate age gradient in Hawaii. Both vertical stature and species composition changed during primary succession, and reveal a progressive increase in vertical stature on younger substrates followed by a collapse on Pleistocene-aged flows. Tall-stature Metrosideros polymorpha woodlands dominated on the youngest substrates (hundreds of years), and were replaced by the tall-stature endemic tree species Myoporum sandwicense and Sophora chrysophylla on intermediate-aged flows (thousands of years). The oldest substrates (tens of thousands of years) were dominated by the short-stature native shrub Dodonaea viscosa and endemic grass Eragrostis atropioides. We excavated 18 macroscopic charcoal fragments from Pleistocene-aged substrates. Mean radiocarbon age was 2,002 years and ranged from < 200 to 7,730. Genus identities from four fragments indicate that Osteomeles spp. or M. polymorpha once occupied the Pleistocene-aged substrates, but neither of these species is found there today. These findings indicate the existence of fires before humans are known to have occupied the Hawaiian archipelago, and demonstrate that a collapse in vertical stature is prevalent on the oldest substrates. This work contributes to our understanding of prehistoric fires in shaping the trajectory of primary succession in Hawaiian drylands. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|