MIT1_018JF09_Lec07

MIT1_018JF09_Lec07 - reservoirs. Typical fluxes range...

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1.018/7.30J fall 2009 Ecology of the Earth System Readings : Lecture 7 Notes –Biogeochemical cycles Galloway, et al.Transformation of the Nitrogen Cycle: …. Science 320, 889 (2008) Oki, et al. Global Hydrological Cycles and World Water Science 313, 1068 (2006) Filippelli, The Global Phosphorus Cycle: Past, Present, and Future. Elements, Vol. 4, pg. 89-95 How much of an element or compound is present in a certain component of the biosphere? What is the global amount, the reservoirs, the compounds and their transformations ? The movements between reservoirs are fluxes . How much of an element or compound moves from one reservoir per unit time? 1.Global geochemical cycles are assessed in terms of fluxes and
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Unformatted text preview: reservoirs. Typical fluxes range > teragrams (10 12 g) per year. 2. The different cycles of the elements (P, S, N, C) vary in terms of their major reservoirs, rates of flux, and biological interaction. 3.Change in valence (redox state) caused by biological processes greatly influence elemental paths in several biogeochemical cycles. 4.Human activities are influencing the flux within some elemental cycles on the same scales as all natural processes combined (P, N, S). MIT OpenCourseWare http://ocw.mit.edu 1.018J / 7.30J Ecology I: The Earth Fall 200 9 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms ....
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MIT1_018JF09_Lec07 - reservoirs. Typical fluxes range...

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