Hurricane Katrina impacts on forest trees of Louisiana's Pearl River basin
Hurricane Katrina impacts on forest trees of Louisiana's Pearl River basin
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DOI：
10.1016/j.foreco.2008.05.057
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发表时间：
2008-08-20
影响因子：
3.7
通讯作者：
White, David A.
中科院分区：
文献类型：
--
作者：
Chapman, Elise L.;Chambers, Jeffrey Q.;White, David A.
飓风干扰有可能显著影响沿海森林结构和生态系统进程。这项研究的重点是卡特里娜飓风对路易斯安那州珠江流域的影响，该流域位于卡特里娜飓风最后登陆路易斯安那州和密西西比州边界的西部。登陆前，在该地区的低地阔叶林的组成和结构进行了研究，在1989年，1998年，2005年和2006年的风暴后的永久性森林资源清查样地取样。这使得直接比较森林结构和动态干扰前后，包括物种特定的树木死亡率和损害率，生物量的生产，和森林类型之间的差异具有不同的水文制度。卡特里娜飓风前的背景树死亡率为1.9%，而包括干扰在内的普查间隔的平均年死亡率为20.5%。从异速生长模型估计的活树生物量变化表明，从扰动前的平均年产量3.5 Mg ha（-1）转变为风暴造成的平均损失77.6 Mg ha（-1）。卡特里娜飓风造成的损失因树种而异，但树木大小不同而差异显着。被洪水淹没的柏树-tupelo沼泽森林遭受的损害最小，经常被洪水淹没的低地硬木森林遭受的损害最大。飓风干扰的影响，这些沿海森林的结构和组成，通过物种的具体差异，在损害和死亡率，和不同的影响取决于森林洪水制度。
Hurricane disturbance has the potential to markedly affect coastal forest structure and ecosystem processes. This study focused on the impacts of Hurricane Katrina in Louisiana's Pearl River basin, which lies just west of Katrina's final landfall at the Louisiana-Mississippi border. Prior to landfall, composition and structure of bottomland hardwood forests in this region were studied with permanent forest inventory plots sampled in 1989, 1998, 2005 and following the storm in 2006. This enabled a direct comparison of forest structure and dynamics before and after the disturbance, including species-specific tree mortality and damage rates, biomass production, and differences among forest types having varied hydrologic regimes. Background tree mortality rate before Hurricane Katrina was 1.9%, while average annual mortality was 20.5% for the census interval including the disturbance. Change in live tree biomass estimated from allometric models demonstrated a shift from an average annual production of 3.5 Mg ha(-1) before the disturbance, to an average loss of 77.6 Mg ha(-1) from the storm. Damage associated with Hurricane Katrina varied significantly with tree species but not tree size. Flooded cypress-tupelo swamp forests sustained the least damage and frequently flooded bottomland hardwood forests sustained the highest damage. Hurricane disturbance influenced the structure and composition of these coastal forests through species-specific differences in damage and mortality rates, and varied impacts dependent on forest flooding regime.