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431.
Refining the ecological footprint 总被引:8,自引:0,他引:8
Ecological footprint measures how much of the biosphere’s annual regenerative capacity is required to renew the natural resources
used by a defined population in a given year. Ecological footprint analysis (EFA) compares the footprint with biocapacity.
When a population’s footprint is greater than biocapacity it is reported to be engaging in ecological overshoot. Recent estimates
show that humanity’s footprint exceeds Earth’s biocapacity by 23%. Despite increasing popularity of EFA, definitional, theoretical,
and methodological issues hinder more widespread scientific acceptance and use in policy settings. Of particular concern is
how EFA is defined and what it actually measures, exclusion of open oceans and less productive lands from biocapacity accounts,
failure to allocate space for other species, use of agricultural productivity potential as the basis for equivalence factors
(EQF), how the global carbon budget is allocated, and failure to capture unsustainable use of aquatic or terrestrial ecosystems.
This article clarifies the definition of EFA and proposes several methodological and theoretical refinements. Our new approach
includes the entire surface of the Earth in biocapacity, allocates space for other species, changes the basis of EQF to net
primary productivity (NPP), reallocates the carbon budget, and reports carbon sequestration biocapacity. We apply the new
approach to footprint accounts for 138 countries and compare our results with output from the standard model. We find humanity’s
global footprint and ecological overshoot to be substantially greater, and suggest the new approach is an important step toward
making EFA a more accurate and meaningful sustainability assessment tool.
相似文献
Jason VenetoulisEmail: |
432.
Bingdi Liu Lin Zhang Jason H. Knouft Fangqiong Ling 《Frontiers of Environmental Science & Engineering》2022,16(5):64
433.
Gavin M. Jones Berry Brosi Jason M. Evans Isabel G. W. Gottlieb Xingwen Loy Mauricio M. Núñez-Regueiro Holly K. Ober Elizabeth Pienaar Rajeev Pillay Kathryn Pisarello Lora L. Smith Robert J. Fletcher Jr. 《Conservation biology》2022,36(3):e13872
International demand for wood and other forest products continues to grow rapidly, and uncertainties remain about how animal communities will respond to intensifying resource extraction associated with woody bioenergy production. We examined changes in alpha and beta diversity of bats, bees, birds, and reptiles across wood production landscapes in the southeastern United States, a biodiversity hotspot that is one of the principal sources of woody biomass globally. We sampled across a spatial gradient of paired forest land-uses (representing pre and postharvest) that allowed us to evaluate biological community changes resulting from several types of biomass harvest. Short-rotation practices and residue removal following clearcuts were associated with reduced alpha diversity (−14.1 and −13.9 species, respectively) and lower beta diversity (i.e., Jaccard dissimilarity) between land-use pairs (0.46 and 0.50, respectively), whereas midrotation thinning increased alpha (+3.5 species) and beta diversity (0.59). Over the course of a stand rotation in a single location, biomass harvesting generally led to less biodiversity. Cross-taxa responses to resource extraction were poorly predicted by alpha diversity: correlations in responses between taxonomic groups were highly variable (−0.2 to 0.4) with large uncertainties. In contrast, beta diversity patterns were highly consistent and predictable across taxa, where correlations in responses between taxonomic groups were all positive (0.05–0.4) with more narrow uncertainties. Beta diversity may, therefore, be a more reliable and information-rich indicator than alpha diversity in understanding animal community response to landscape change. Patterns in beta diversity were primarily driven by turnover instead of species loss or gain, indicating that wood extraction generates habitats that support different biological communities. 相似文献