Biomass (Mg ha⁻¹) and C stocks (Mg ha⁻¹) of downed wood for tall and medium mangroves.

<p>Sites were sampled within Sian Ka'an Biosphere Reserve, Mexico. Wood debris was calculated separately for small wood (diameter >2.5 and <7.5 cm), and large sound and large rotten wood (diameter >7.5 cm). Values are shown as mean (standard error).</p

Ecosystem C stocks of coastal wetlands of Sian Ka'an Biosphere Reserve.

<p>The stocks are partitioned by A) aboveground (trees and down wood) and B) belowground (roots and soil) components. Lower case letters represent significant differences among sites and vegetation types (<i>n</i> = 6 per site, <i>p</i>≤0.0001). Note different scales between panel A and B.</p

Aboveground biomass, belowground biomass and total C stocks in vegetation (Mg ha⁻¹).

<p>Data are mean (standard error).</p><p>Nine sites were sampled (<i>n</i> = 6 plots per site) within coastal wetlands of Sian Ka'an Biosphere Reserve, Mexico. Values are shown as mean (standard error); n.a. = not available.</p>*<p>aboveground biomass of marsh.</p>**<p>aboveground biomass of marsh plus mangrove trees.</p>***<p>belowground biomass of mangrove trees.</p

Relationship among mangrove C stocks, interstitial salinity and surface soil phosphorus.

<p>Seven mangrove sites were sampled within Sian Ka'an Biosphere Reserve, Mexico; three dwarf, two medium, and two tall mangroves, one of the latter associated to a fresh water spring. Soil phosphorus (P) was measured in the 0–15 cm soil horizon. The correlations are significant with <i>R</i>² = 0.54, <i>F</i> = 31.3, <i>p</i><0.0001 and <i>R</i>² = 0.58, <i>F</i> = 26.3, <i>p</i><0.001 for C stocks against salinity and soil P, respectively. Collectively, salinity and soil P explained 86% of the variance in mangrove C stocks (<i>F</i> = 45.6, <i>p</i><0.001; VIF = 2.2).</p

Allometric equations used to calculate aboveground and belowground biomass of mangrove trees.

<p>B = biomass; D_R = diameter above highest prop root; DBH = diameter at breast height; D₃₀ = diameter at 30 cm from the ground. Wood density values used for calculating belowground biomass were obtained from Zanne et al <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0056569#pone.0056569-Zanne1" target="_blank">[36]</a>.</p

Ecosystem C stocks (Mg ha⁻¹) of nine sites within different vegetation types of coastal wetlands of the Sian Ka'an Biosphere Reserve, Mexico.

<p>Values are shown as mean (standard error).</p

Area and C stock of coastal wetland vegetation of Sian Ka'an Biosphere Reserve, Mexico.

<p>Mangrove area (dwarf+medium+tall) was obtained from CONABIO <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0056569#pone.0056569-CONABIO2" target="_blank">[23]</a>, “peten” vegetation area (tall mangroves associated with freshwater springs) and marsh area from INEGI maps (2005 and 2000, respectively) <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0056569#pone.0056569-INEGI1" target="_blank">[24]</a>.</p