The average age of broadleaf stands that were paired with pastures was 18 years, whereas in the Broadleaf–Conifer blocks the average age of broadleaf standswas 27 years and 28 years for conifer stands. For broadleaf stands paired with adjacent pastures, the 95% confidence interval for annual soil C accretion rates was 0.20 to
+0.16 Mg C ha1 yr1, representing the relative C accretion rate for conversion from pasture to broadleaf plantations. For the Broadleaf– Conifer blocks, we used the mean pasture soil C values as a baseline since no adjacent pastures were available next to these stands. Using this baseline, the 95% confidence interval for conversion from pasture to conifer plantation was 0.26 to +0.50 Mg C ha1 yr1, and was 0.24 to +0.74 Mg C ha1 yr1 for Broadleaf stands within the Broadleaf–Conifer blocks. All confidence intervals therefore included zero for relative change in C accretion rates at 18, 27, and 28 years after plantation establishment
The average age of broadleaf stands that were paired with pastures was 18 years, whereas in the Broadleaf–Conifer blocks the average age of broadleaf standswas 27 years and 28 years for conifer stands. For broadleaf stands paired with adjacent pastures, the 95% confidence interval for annual soil C accretion rates was 0.20 to+0.16 Mg C ha1 yr1, representing the relative C accretion rate for conversion from pasture to broadleaf plantations. For the Broadleaf– Conifer blocks, we used the mean pasture soil C values as a baseline since no adjacent pastures were available next to these stands. Using this baseline, the 95% confidence interval for conversion from pasture to conifer plantation was 0.26 to +0.50 Mg C ha1 yr1, and was 0.24 to +0.74 Mg C ha1 yr1 for Broadleaf stands within the Broadleaf–Conifer blocks. All confidence intervals therefore included zero for relative change in C accretion rates at 18, 27, and 28 years after plantation establishment
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