. Bulletin - Le Sud de l'Académie des Sciences de Californie. La science. Stockage de carbone organique du sol dans des marais salants 157 Carbone organique ( %) o Q. (D Q 0-2 2-4 4-6 6-8 8-10 10-12 12-14 14-16 16-18 18-20 20-22 22-24 24-26 26-28 28-30 30-32 32-34 34-36 36-38 38-40 40-42 42-44 44-46. 10 i 15 I 20 I 25 -•- Brookhurst O Talbert p =0,071 Site p<Profondeur Site 0,001*profondeur p<0,001 Fig. 2. Profils de profondeur de sol en carbone organique (moyenne ± SE) en 1 Talbert (restauré en 1989) et Brookhurst (restauré en 2009) marais. Résultats d'une ANOVA à mesures répétées avec des site comme un facteur fixe et la profondeur comme un repe

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. Bulletin - Southern California Academy of Sciences. Science. SOIL ORGANIC CARBON STORAGE IN RESTORED SALT MARSHES 157 Organic Carbon (%) o Q. (D Q 0-2 2-4 4-6 6-8 8-10 10-12 12-14 14-16 16-18 18-20 20-22 22-24 24-26 26-28 28-30 30-32 32-34 34-36 36-38 38-40 40-42 42-44 44-46. 10 _i 15 I 20 I 25 -•— Brookhurst O Talbert Site p=0.071 Depth p<0.001 Site*Depth p<0.001 Fig. 2. Depth profiles of soil organic carbon content (mean ± 1 SE) in Talbert (restored in 1989) and Brookhurst (restored in 2009) Marshes. Results of a repeated measures ANOVA with site as a fixed factor and depth as a repeated factor are shown. (e.g., arcsin square root and logarithmic transformations). The repeated measures ANOVA was performed on un-transformed data. We used t-tests to analyze differences in NER, belowground biomass, and total carbon storage between Talbert and Brookhurst. Belowground biomass data were logged-transformed to meet assumptions of normality prior to analysis. Linear regressions were used to explore potential relationships between belowground biomass (collected adjacent to soil cores) and cumulative soil carbon storage in the upper 10 and 40 cm of the soil profile. All analyses were completed using PASW Statistics 18 (SPSS 2009). Results Mean percent soil organic carbon was higher at all depths in the more recently restored Brookhurst Marsh than in Talbert Marsh (Figure 2). However, differences between sites varied by depth (depth * site interaction F(20, 80) = 6.338, p<0.001; Figure 2). In both sites, the highest organic carbon content was seen in the surface 0-2 cm with 18.8 ± 1.8% and 5.4 ± 2.9% (mean ± 1 SE) in Brookhurst and Talbert, respectively. When corrected for bulk density, the total amount of organic carbon held in the upper 40 cm of the soil profile (mean ± 1 SE) did not differ between sites with 13.6 ± 0.3 kg carbon in ~ in Brookhurst and 9.3 ± 0.8 kg carbon m~- in Talbert (t(4)=1.58, p=0.19). NER as net CO2 flux was similar between sites

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