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Carbon and Nitrogen Losses by Surface Runoff following Changes in Vegetation

^a Dep. of Ecology, Evolution, and Marine Biology, Univ. of California, Santa Barbara, CA 93106
^b Dep. of Geological Sciences, Univ. of California, Santa Barbara, CA 93106

View larger version (36K): [in a new window]   Fig. 1. Relationships between loss rates of dissolved nutrients and rainfall intensities for all annual grassland rainfall simulations. (A) NH+4, (B) NO-3, (C) solute organic N, (D) solute organic C. The R2 values are from best fit regressions using power functions. Only the NO-3 data showed a significant (P < 0.05) relationship with intensity.

View larger version (20K): [in a new window]   Fig. 2. Comparison of loss rates of dissolved nutrients in simulations with and without raindrop impact on a series of paired plots. Note separate axes for N and C data. * = loss rates are significantly different (P < 0.05) between rain and flow simulations. Error bars represent one standard error.

View larger version (25K): [in a new window]   Fig. 3. Nutrient loss rates in solute from grassland and trampled sage scrub plots. Note separate axes for the N and C data. * = significant difference (P < 0.05) in the nutrient loss rate between sage and grass plots. Error bars represent one standard error.

View larger version (18K): [in a new window]   Fig. 4. Model estimates of sediment C and N loss in surface runoff from annual grassland hillslopes with changes in vegetation cover. Rainfall intensity = 15 mm h-1.

View larger version (18K): [in a new window]   Fig. 5. Model estimates of sediment C and N loss in surface runoff from annual grassland hillslopes with changes in rainfall intensity. Vegetation cover = 0.6.