Warming accelerates mangrove expansion and surface elevation gain in a subtropical wetland
Warming accelerates mangrove expansion and surface elevation gain in a subtropical wetland
复制标题
DOI：
10.1111/1365-2745.13049
复制
发表时间：
2019-01-01
影响因子：
5.5
通讯作者：
Chapman, Samantha K.
中科院分区：
文献类型：
--
作者：
Coldren, Glenn A.;Langley, J. Adam;Chapman, Samantha K.
1.气候变暖可以改变沿海湿地植物的生长方式，从而改变它们建造土地的能力，并与海平面上升保持同步。随着气候变化，冰冻事件减少，红树林将其范围扩大到更高的纬度，并取代盐沼植被。随着沿海湿地生物群落的急剧变化，气温升高可能会改变地上和地下植物的动态，这反过来又可能导致生态系统功能的变化，如沉积物的积累。我们在亚热带湿地进行了一个大规模的原位增温实验，以提高沼泽和红树林生态系统的气温。我们评估了2年的持续变暖如何影响地上和地下植物生长以及相对于海平面的表面高程。我们发现，慢性变暖植物高度增加了一倍，并加速扩展的红树林到盐沼植被，如6倍以上的增加红树林覆盖在温暖的地块相比，环境温度地块和相应的损失盐沼覆盖。地表高程增加，土壤建设能力的措施，增加了由于变暖超过2年的时间，这些变化在地表高程是由增加红树林根生产在温暖的地块。合成.我们的研究结果表明，在一些沿海湿地中，变暖可以促进植物群落从沼泽到红树林的变化，相应的生长增加有助于沿海湿地跟上海平面上升的步伐。
1. Climatic warming can change how coastal wetland plants grow, thus altering their capacity to build land and keep pace with rising seas. As freeze events decline with climate change, mangroves expand their range to higher latitudes and displace salt marsh vegetation. Warmer air temperatures will likely alter above- and below-ground plant dynamics as this dramatic coastal wetland biome shift proceeds, which in turn may result in changes in ecosystem function such as sediment building.2. We used a large scale in situ warming experiment in a subtropical wetland to increase both marsh and mangrove ecosystem air temperatures. We assessed how 2 years of continuous warming influenced above- and below-ground plant growth and surface elevation relative to sea level.3. We found that chronic warming doubled plant height and accelerated the expansion of mangrove into salt marsh vegetation, as indicated by a sixfold greater increase in mangrove cover in warmed plots compared to ambient temperature plots and a corresponding loss in salt marsh cover. Surface elevation gain, a measure of soil-building capacity, increased due to warming over a 2-year period and these changes in surface elevation were driven by increased mangrove root production in warmed plots.4. Synthesis. Our findings suggest that, in some coastal wetlands, warming can facilitate plant community changes from marsh to mangrove, with corresponding increases in growth that help coastal wetlands to keep pace with sea-level rise.