Mangrove expansion and rainfall patterns in Moreton Bay, Southeast Queensland, Australia
Mangrove expansion and rainfall patterns in Moreton Bay, Southeast Queensland, Australia
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DOI：
10.1016/j.ecss.2009.08.011
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发表时间：
2009-11-10
影响因子：
2.8
通讯作者：
Chaseling, J.
中科院分区：
文献类型：
--
作者：
Eslami-Andargoli, L.;Dale, Per;Chaseling, J.
降雨模式的变化被认为是红树林向陆地入侵盐沼的一个机制。这项研究的目的是评估1972年至2004年32年间，澳大利亚昆士兰州东南部摩顿湾研究地点的降雨模式与红树林空间分布之间的关系。为了确定降雨模式相对一致的时期，降雨模式变化的点（变化点）被使用非参数Pettitt-Mann-Whitney-Statistic和累积和技术确定。然后使用变化点来确定评估红树林面积变化的时间周期。红树林和盐沼面积都是通过1972年、1990年（变化点最显著的年份）和2004年获得的数字化航空照片来测量的。估算了1990年以前（湿润期）和1990年以后（干旱期）红树林面积的变化率。降雨变量与红树林向陆地扩张呈显著正相关，而与向海洋扩张无显著正相关。结果表明，降雨变率是影响红树林上坡侵蚀速率的主要因素之一。然而，由于特定地点的地貌和水文特征以及集水区的扰动程度，扩展的速度可能因地点而异。2009爱思唯尔有限公司版权所有。
Changes in rainfall pattern have been suggested as a mechanism for the landward incursion of mangrove into salt marsh. The aim of the research was to assess the relationship between rainfall patterns and the spatial distribution of mangrove forests at study sites in Moreton Bay, Southeast Queensland, Australia, over a 32-year period from 1972 to 2004. To identify periods of relatively consistent rainfall patterns points at which rainfall patterns changed (change-points) were identified using the non-parametric Pettitt-Mann-Whitney-Statistic and the cumulative sum technique. The change-points were then used to define the temporal periods over which changes to mangrove area were assessed. Both mangrove and salt marsh area were measured by digitizing aerial photographs acquired in 1972,1990 (the year with the most significant change-point), and 2004. The rates of change in mangrove area pre-1990 (a wetter period) and post-1990 (a drier period) were estimated. A significant positive relationship was demonstrated between rainfall variables and landward mangrove expansion, but not for seaward expansion. We concluded that rainfall variability is one of the principal factors influencing the rate of upslope encroachment of mangrove. However, the rate of expansion may vary from site to site due to site-specific geomorphological and hydrological characteristics and the level of disturbance in the catchment. (C) 2009 Elsevier Ltd. All rights reserved.