Mangroves among the most carbon-rich forests in the tropics
Mangroves among the most carbon-rich forests in the tropics
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DOI：
10.1038/ngeo1123
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发表时间：
2011-05-01
影响因子：
18.3
通讯作者：
Kanninen, Markku
中科院分区：
文献类型：
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作者：
Donato, Daniel C.;Kauffman, J. Boone;Kanninen, Markku
红树林分布在整个热带地区的沿着海洋海岸线，并支持许多生态系统服务，包括渔业生产和养分循环。然而，由于沿海开发、水产养殖扩张和过度捕捞，过去半个世纪以来，红树林的面积减少了30-50%（1-4）。由于红树林损失而产生的碳排放量是不确定的，部分原因是缺乏关于这些生态系统中储存的碳量的大规模数据，特别是地下（5）。在这里，我们通过测量树木和枯木生物量，土壤碳含量和土壤深度来量化整个生态系统的碳储存，这些红树林分布在印度洋-太平洋地区的广阔地区-跨越30度纬度和73度纬度-红树林面积和多样性最大（4，6）。这些数据表明，红树林是热带地区碳含量最丰富的森林之一，平均每公顷含碳1,023毫克。有机质丰富的土壤深度从0.5米到3米以上，占这些系统碳储量的49-98%。结合我们的数据和其他已发表的信息，我们估计，红树林砍伐每年产生0.02-0.12 Pg碳排放量-高达全球砍伐森林排放量的10%左右，尽管仅占热带森林面积的0.7%（6，7）。
Mangrove forests occur along ocean coastlines throughout the tropics, and support numerous ecosystem services, including fisheries production and nutrient cycling. However, the areal extent of mangrove forests has declined by 30-50% over the past half century as a result of coastal development, aquaculture expansion and over-harvesting(1-4). Carbon emissions resulting from mangrove loss are uncertain, owing in part to a lack of broad-scale data on the amount of carbon stored in these ecosystems, particularly below ground(5). Here, we quantified whole-ecosystem carbon storage by measuring tree and dead wood biomass, soil carbon content, and soil depth in 25 mangrove forests across a broad area of the Indo-Pacific region-spanning 30 degrees of latitude and 73 degrees of longitude-where mangrove area and diversity are greatest(4,6). These data indicate that mangroves are among the most carbon-rich forests in the tropics, containing on average 1,023Mg carbon per hectare. Organic-rich soils ranged from 0.5m to more than 3m in depth and accounted for 49-98% of carbon storage in these systems. Combining our data with other published information, we estimate that mangrove deforestation generates emissions of 0.02-0.12 Pg carbon per year-as much as around 10% of emissions from deforestation globally, despite accounting for just 0.7% of tropical forest area(6,7).