DOI: 10.1016/j.foreco.2014.12.019
Scopus记录号: 2-s2.0-84922696540
论文题名: Quantifying habitat loss: Assessing tree encroachment into a serpentine savanna using dendroecology and remote sensing
作者: April Sahara E. ; Sarr D.A. ; Van Kirk R.W. ; Jules E.S.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2015
卷: 340 起始页码: 9
结束页码: 21
语种: 英语
英文关键词: Dendroecology
; Encroachment
; Jeffrey pine
; Remote sensing
; Savanna
; Serpentine
Scopus关键词: Ecology
; Plants (botany)
; Remote sensing
; Serpentine
; Silicate minerals
; Dendroecology
; Ecological changes
; Encroachment
; Jeffrey pine
; Landscape diversity
; Management concerns
; Reference condition
; Savanna
; Forestry
; aerial photography
; biological invasion
; coniferous forest
; dendroecology
; forest management
; habitat loss
; remote sensing
; savanna
; serpentine
; Ecology
; Forests
; Plants
; Remote Sensing
; Wood
; California
; United States
; Pinus jeffreyi
英文摘要: For over a century, increases in the abundance of woody plants in savannas have been occurring worldwide in a process known as encroachment. Encroachment into savannas is a significant management concern because it affects the unique values associated with savanna systems, including high levels of both taxonomic and landscape diversity. Improving methods for reconstructing encroachment patterns should aid savanna management, especially if the methods provide a baseline from which to assess and project ecological change. We reconstructed the encroachment history of a small serpentine Jeffrey pine savanna and forecasted future landscape change using two distinct approaches. First, we used dendroecology to determine encroachment rates, establish historical site reference conditions, and project tree-growth trends. Second, we used historical aerial photographs to construct a spatial model of past tree encroachment and to predict near future encroachment. We found encroachment began ~1850 and was not related to differences in topography across the landscape. Trees greater than 30. cm in diameter have increased from a mean stem density of ~1.6 trees per ha in 1890 to a mean stem density of ~13.8 trees per ha in 2009. Concomitant with the increase in tree density and average tree size was the contraction of the grass-dominated areas of the savanna, which represented ~50% of Little Bald Hills in 1942, but less than 10% in 2009. If current encroachment rates continue, our models suggest that less than 5% of Little Bald Hills will be grassland in 50. years. This is not the first study to utilize both historical photo analysis and dendroecology, but it is the first to use these tools to identify explicit locations where encroachment is likely to occur in the near future. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65542
Appears in Collections: 影响、适应和脆弱性
There are no files associated with this item.
作者单位: Department of Biological Sciences, Humboldt State University, Arcata, CA, United States; Klamath Network, National Park Service, Ashland, OR, United States; Department of Mathematics, Humboldt State University, Arcata, CA, United States; Grand Canyon Monitoring and Research Center-SBSC, U.S. Geological Survey, Flagstaff, AZ, United States; Henry's Fork Foundation, Ashton, ID, United States
Recommended Citation:
April Sahara E.,Sarr D.A.,Van Kirk R.W.,et al. Quantifying habitat loss: Assessing tree encroachment into a serpentine savanna using dendroecology and remote sensing[J]. Forest Ecology and Management,2015-01-01,340