Third Institute of Oceanography, State Oceanic Administration, Xiamen, Fujian, China.
Research Centre for Oceanography, Indonesian Institute of Sciences, Indonesia.
Sci Rep. 2017 Feb 10;7:42406. doi: 10.1038/srep42406.
Mangrove forests have the potential to export carbon to adjacent ecosystems but whether mangrove-derived organic carbon (OC) would enhance the soil OC storage in seagrass meadows adjacent to mangroves is unclear. In this study we examine the potential for the contribution of mangrove OC to seagrass soils on the coast of North Sulawesi, Indonesia. We found that seagrass meadows adjacent to mangroves had significantly higher soil OC concentrations, soil OC with lower δ C, and lower bulk density than those at the non-mangrove adjacent meadows. Soil OC storage to 30 cm depth ranged from 3.21 to 6.82 kg C m, and was also significantly higher at the mangrove adjacent meadows than those non-adjacent meadows. δC analyses revealed that mangrove OC contributed 34 to 83% to soil OC at the mangrove adjacent meadows. The δC value of seagrass plants was also different between the seagrasses adjacent to mangroves and those which were not, with lower values measured at the seagrasses adjacent to mangroves. Moreover, we found significant spatial variation in both soil OC concentration and storage, with values decreasing toward sea, and the contribution of mangrove-derived carbon also reduced with distance from the forest.
红树林有向相邻生态系统输出碳的潜力，但红树林来源的有机碳（OC）是否会增加相邻海草床的土壤 OC 储量尚不清楚。本研究考察了印度尼西亚北苏拉威西沿海红树林 OC 对海草土壤的潜在贡献。结果表明，与非红树林相邻的海草床相比，红树林相邻的海草床具有更高的土壤 OC 浓度、更低的 δ^13^C 和更低的容重。0-30cm 土层的土壤 OC 储量范围为 3.21-6.82kg C m^-2^，红树林相邻海草床的土壤 OC 储量也明显高于非相邻海草床。δ^13^C 分析表明，红树林 OC 对红树林相邻海草床土壤 OC 的贡献率为 34-83%。与非红树林相邻的海草相比，红树林相邻的海草的 δ^13^C 值也不同，红树林相邻的海草的 δ^13^C 值较低。此外，我们发现土壤 OC 浓度和储量都存在显著的空间变化，随着向海的距离增加而降低，而来自红树林的碳贡献也随着与森林的距离增加而减少。
