Dynamics of mangrove forests in the Mangoky River delta, Madagascar, under the influence of natural and human factors
Dynamics of mangrove forests in the Mangoky River delta, Madagascar, under the influence of natural and human factors
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DOI：
10.1016/j.foreco.2010.01.002
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发表时间：
2010-03
影响因子：
3.7
通讯作者：
A. Rakotomavo;F. Fromard
中科院分区：
文献类型：
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作者：
A. Rakotomavo;F. Fromard
马达加斯加的红树林覆盖327000公顷至340300公顷。一些作者研究了这些红树林，但我们还没有对这些生态系统的完整知识。本研究试图通过分析1951年至2000年期间在曼戈基三角洲（马达加斯加西南部）的红树林范围内的动态和变化来回应这一关注。底图与陆地卫星TM图像之间的比较表明，红树林面积保持相对稳定，甚至在1951年至1979年期间略有增加（+189公顷）。从1979年到1994年，其面积从21426公顷减少到11706公顷（-9720公顷）。然后在1994年至2000年期间再次增加（增加84公顷）。从1951年到2000年，这一比例下降了41.74%。这些数字可以与国家（56年为-15%）和世界（过去20年为-35%）的统计数据进行比较。三个主要原因来解释这些变化：（1）水文和沉积行为的曼戈基河;（2）植物演替的机制，这取决于潮汐和底层的特点和（3）人类活动和伐木，这已经增加，自1980年代以来在曼戈基三角洲。
Mangroves in Madagascar cover 327000ha to 340300ha. Several authors have studied these mangroves, but we do not yet have a complete knowledge of these ecosystems. The present study is an attempt to respond to this concern by analyzing dynamics and changes in the extent of the mangrove forest in the Mangoky delta (SW Madagascar) between 1951 and 2000. The comparison between base maps and Landsat TM images shows that the mangrove area remained relatively stable, even increasing slightly (+189ha) between 1951 and 1979. From 1979 to 1994, its area decreased from 21426ha to 11706ha (−9720ha). It then increased again (+84ha) between 1994 and 2000. The balance was a decrease of 41.74% between 1951 and 2000. These figures may be compared with national (−15% in 56 years) and world (−35% for the last 20 years) statistics. Three main reasons are given to explain these changes: (1) the hydrological and sedimentological behavior of the Mangoky River; (2) the mechanism of plant succession, which depends on tides and on the characteristics of the substratum and (3) human activities and logging, which have increased since the 1980s in the Mangoky delta.