A global evaluation of forest interior area dynamics using tree cover data from 2000 to 2012
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Published maps of global tree cover derived from Landsat data have indicated substantial changes in forest area from 2000 to 2012. The changes can be arranged in different patterns, with different consequences for forest fragmentation. Thus, the changes in forest area do not necessarily equate to changes in forest sustainability.
The objective is to assess global and regional changes in forest fragmentation in relation to the change of forest area from 2000 to 2012.
Using published global tree cover data, forest and forest interior areas were mapped in 2000 and 2012. The locations of forest interior change were compared to the locations of overall forest change to identify the direct (pixel level) and indirect (landscape level) components of forest interior change. The changes of forest interior area were compared to the changes of total forest area in each of 768 ecological regions.
A 1.71 million km2 (3.2 %) net loss of global forest area translated to a net loss of 3.76 million km2 (9.9 %) of forest interior area. The difference in loss rates was consistent in most of the 768 ecological regions. The indirect component accounted for 2.44 million km2 of the net forest interior change, compared to 1.32 million km2 that was attributable to the direct component.
Forest area loss alone from 2000 to 2012 underestimates ecological risks from forest fragmentation. In addition to the direct loss of forest, there was a widespread shift of the remaining global forest to a more fragmented condition.
KeywordsSpatial analysis Forest fragmentation Monitoring Assessment
We thank M. Hansen, his colleagues, and Google Earth Engine for the global forest change maps. The United States Environmental Protection Agency (EPA), through its Office of Research and Development, partially funded and collaborated in the research described here. It has been subjected to EPA review and approved for publication.
- FAO (Food and Agriculture Organization of the United Nations) (2010) Global forest resource assessment 2010. FAO Forestry Paper 163, RomeGoogle Scholar
- Haddad NM, Brudvig LA, Clobert J, Davies KF, Gonzalez A, Holt RD, Lovejoy TE, Sexton JO, Austin MP, Collins CD, Cook WM, Damschen EI, Ewers RM, Foster BL, Jenkins CN, King AJ, Laurance WF, Levey DJ, Margules CR, Melbourne BA, Nicholls AO, Orrock JL, Song D-X, Townshend JR (2015) Habitat fragmentation and its lasting impact on Earth’s ecosystems. Sci Adv 1:e1500052PubMedPubMedCentralCrossRefGoogle Scholar
- Hansen MC, Potapov PV, Moore R, Hancher M, Turubanova SA, Tyukavina A, Thau D, Stehman SV, Goetz SJ, Loveland TR, Kommareddy A, Egorov A, Chini L, Justice CO, Townshend JRG (2013) High-resolution global maps of 21st-century forest cover change. Science 342:850–853. http://earthenginepartners.appspot.com/science-2013-global-forest. Accessed 5 March 2014
- Harris LD (1984) The fragmented forest. University of Chicago Press, ChicagoGoogle Scholar
- Heinz Center (The H. John Heinz III Center for Science, Economics, and the Environment) (2008) The state of the nation’s ecosystems 2008. Island Press, Washington, DCGoogle Scholar
- Innes JL, Koch B (1998) Forest biodiversity and its assessment by remote sensing. Glob Ecol Biogeogr Lett 7:397–419Google Scholar
- Millennium Ecosystem Assessment (2005) Ecosystems and human well-being: biodiversity synthesis. World Resources Institute, Washington, DCGoogle Scholar
- Olson DM, Dinerstein E, Wikramanayake ED, Burgess ND, Powell GVN, Underwood EC, D’Amico JA, Itoua I, Strand HE, Morrison JC, Loucks CJ, Allnutt TF, Ricketts TH, Kura Y, Lamoreux JF, Wettengel WW, Hedao P, Kassem KR (2001) Terrestrial ecoregions of the world: a new map of life on Earth. Bioscience 51:933–938CrossRefGoogle Scholar
- Riitters K, Wickham J, O’Neill RV, Jones B, Smith E (2000) Global-scale patterns of forest fragmentation. Ecol Soc 4(2):3Google Scholar
- Rose RA, Byler D, Eastman JR, Fleishman E, Geller G, Goetz S, Guild L, Hamilton H, Hansen M, Headley R, Hewson J, Horning N, Kaplin BA, LaPorte N, Leidner A, Leimgruber P, Morisette J, Musinsky J, Pintea L, Prados A, Radeloff VC, Rowen M, Saatchi S, Schill S, Tabor K, Turner W, Vodacek A, Vogelmann J, Wegmann M, Wilkie D, Wilson C (2014) Ten ways remote sensing can contribute to conservation. Conserv Biol 29:350–359PubMedCrossRefGoogle Scholar
- Roy DP, Wulder MA, Loveland TR, Woodcock CE, Allen RG, Anderson MC, Helder D, Irons JR, Johnson DM, Kennedy R, Scambos TA, Schaaf CB, Schott JR, Sheng Y, Vermote EF, Belward AS, Bindschadler R, Cohen WB, Gao F, Hipple JD, Hostert P, Huntington J, Justice CO, Kilic A, Kovalskyy V, Lee ZP, Lymburner L, Masek JG, McCorkel J, Shuai Y, Trezza R, Vogelmann J, Wynne RH, Zhu Z (2014) Landsat-8: science and product vision for terrestrial global change research. Remote Sens Environ 145:154–172CrossRefGoogle Scholar
- Sexton JO, Song XP, Feng M, Noojipady P, Anand A, Huang C, Kim D-H, Collins KM, Channan S, DiMiceli C, Townshend JR (2013) Global, 30-m resolution continuous fields of tree cover: landsat-based rescaling of MODIS vegetation continuous fields with lidar-based estimates of error. Int J Digit Earth 6:427–448CrossRefGoogle Scholar
- Turner BL II, Lambin EF, Reenberg A (2007) The emergence of land change science for global environmental change and sustainability. Proc Natl Acad Sci 104:2066–20671Google Scholar
- US Environmental Protection Agency (2008) EPA’s 2008 report on the environment. EPA/600/R-07/045F. National Center for Environmental Assessment, Washington, DC. Available from the National Technical Information Service, Springfield. http://www.epa.gov/roe
- USDA (United States Department of Agriculture) Forest Service (2004) National report on sustainable forests—2003. Publication FS-766. USDA Forest Service, Washington, DCGoogle Scholar
- USDA (United States Department of Agriculture) Forest Service (2011) National report on sustainable forests—2010. Publication FS-979. USDA Forest Service, Washington, DCGoogle Scholar
- USDA (United States Department of Agriculture) Forest Service (2012) Future of America’s forest and rangelands: Forest Service 2010 Resources Planning Act assessment. General Technical Report WO-87. Washington, DCGoogle Scholar
- Wade TG, Riitters KH, Wickham JD, Jones KB (2003) Distribution and causes of global forest fragmentation. Ecol Soc 7(2):7Google Scholar
- Wickham JD, Riitters KH, Wade TG, Homer C (2008) Temporal change in fragmentation of continental US forests. Landscape Ecol 23:891–898Google Scholar
- World Wildlife Fund (2004) Terrestrial ecoregions of the world. Version 2.0 (digital map). The World Wildlife Fund, Washington, DC. http://www.worldwildlife.org/publications/terrestrial-ecoregions-of-the-world. Accessed 4 Feb 2009