166 research outputs found
The Future of Conventional Deterrence
The 1990\u27s will see the emergence of a new and qualitatively different world order that will require United States to recast its traditional approaches to foreign policy and national security. For four decades national security policy in the United States, largely defined by the superpower rivalry, was heavily dependent upon strategic nuclear deterrence. Today, as the era of bipolarity recedes, we may confidently expect new and different challenges to our important interest abroad
Carbon storage of headwater riparian zones in an agricultural landscape
<p>Abstract</p> <p>Background</p> <p>In agricultural regions, streamside forests have been reduced in age and extent, or removed entirely to maximize arable cropland. Restoring and reforesting such riparian zones to mature forest, particularly along headwater streams (which constitute 90% of stream network length) would both increase carbon storage and improve water quality. Age and management-related cover/condition classes of headwater stream networks can be used to rapidly inventory carbon storage and sequestration potential if carbon storage capacity of conditions classes and their relative distribution on the landscape are known.</p> <p>Results</p> <p>Based on the distribution of riparian zone cover/condition classes in sampled headwater reaches, current and potential carbon storage was extrapolated to the remainder of the North Carolina Coastal Plain stream network. Carbon stored in headwater riparian reaches is only about 40% of its potential capacity, based on 242 MgC/ha stored in sampled mature riparian forest (forest > 50 y old). The carbon deficit along 57,700 km headwater Coastal Plain streams is equivalent to about 25TgC in 30-m-wide riparian buffer zones and 50 TgC in 60-m-wide buffer zones.</p> <p>Conclusions</p> <p>Estimating carbon storage in recognizable age-and cover-related condition classes provides a rapid way to better inventory current carbon storage, estimate storage capacity, and calculate the potential for additional storage. In light of the particular importance of buffer zones in headwater reaches in agricultural landscapes in ameliorating nutrient and sediment input to streams, encouraging the restoration of riparian zones to mature forest along headwater reaches worldwide has the potential to not only improve water quality, but also simultaneously reduce atmospheric CO<sub>2</sub>.</p
Echoes without resonance:Critiquing certain aspects of recent scholarly trends in the study of the Jewish scriptures in the New Testament
sagepub.co.uk/journalsPermissions.na
Assessing Physical Activity and its Relationship to Cardiovascular Risk Factors: NHANES 2003-2006
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