Localized erosion affects national carbon budget

Details Localized erosion affects national carbon budget Localized erosion affects national carbon budget

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3301402s&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 1, CiteID L01402

Physics

3

Biogeosciences: Carbon Cycling (4806), Hydrology: Erosion, Hydrology: Extreme Events, Hydrology: Human Impacts

Scientific paper

Small mountainous rivers discharge disproportionate amounts of sediment and carbon to the Earth's oceans. Our New Zealand data demonstrates that localized erosion plays a greater role in C budgets than has been recognized in national and global studies. We estimate that New Zealand's rivers export 4 +/- 1 Mg C km-2 yr-1 of dissolved organic carbon (DOC) and 10 +/- 3 Mg C km-2 yr-1 of particulate organic carbon (POC) (2 and 6 times the global average), which is equivalent to 40% of New Zealand's fossil fuel emissions. Under intact native vegetation in mountain-belt hot spots, POC export greatly exceeds CO2 consumption from mineral weathering. Moreover, deforestation of fertile steepland greatly accelerates POC loss, evidenced by 1.7% of New Zealand's land area which generates 20% of exported POC. Thus, localized erosion deserves increased attention in C budgets and accounting.

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