红树林是生长在热带、亚热带海岸潮间带上部的潮摊湿地木本生物群落。近年来，中国滨海湿地面积严重萎缩，尤其是红树林湿地和珊瑚礁生态系统。全球气候变化背景下，极端气候事件（如台风）发生的不确定性在增大。台风对热带和温带地区沿海湿地生态系统的影响包括直接影响（如大风、海啸和风暴潮），以及台风引起的间接影响（如大规模暴雨和洪水）。台风与其伴随灾害之间的关系，以及沿海湿地生态系统本身的复杂性，导致其对沿海湿地生态系统的影响也很复杂。此外，由于台风发生的时空不确定性及其路径变化，以及热带亚热带海岸湿地自然环境的挑战（特别是在恶劣天气条件下的取样），沿海湿地生态系统的台风影响调查更加困难。台风对沿海湿地植物的影响，尤其是红树林及其恢复引起了人们的一直关注。目前北美、日本等受热带风暴严重影响的国家和地区相对关注较多。 本研究应用Landsat系列遥感数据，采用像元二分模型法研究了1985-2018年间东寨港红树林面积变化及其时空格局变化；筛选热带气旋尺度资料构建了1985-2016年间东寨港台风灾害事件集。通过二者相关性分析发现东寨港红树林年际面积变化与东寨港台风近中心最大风速呈负相关。据此，借助东寨港长时序面积数据集，以EVI为台风扰动指数，进一步对东寨港影响严重的16场典型历史台风灾前灾后红树林面积进行求差，从而得到相应台风灾害红树林灾前灾后的变化面积（即受损面积），并分析其空间分布特征。基于红树林受损面积及对应台风近中心最大风速，构建台风灾害强度-红树林面积受损率曲线（脆弱性曲线）。最后，分析了东寨港红树林台风灾害分级受损分布及其特征，主要包括东寨港红树林分区与群落物种受台风影响的差异。本文主要研究结果如下。 （1）1985-2018年间海南省东寨港红树林面积呈波动增长趋势，最大值为1739.04ha（2018年），最小值为798.93ha（1988年）；1992年前红树林总体长势较差，尤其是塔市区、三江区、罗豆区西部以及铺前区，自1993年后红树林面积有所增长；道学区和罗豆区东部红树林面积长势稳定。 （2）台风灾害红树林受损面积整体呈现分布于红树林区边缘及靠近海域及潮沟附近的特征。将16场台风的近中心最大风速与其对应的红树林受损面积做相关性分析，结果Logistic的拟合结果最优（R2=0.6898，P<0.001）。台风在9-12级或更大风力时造成红树林较大的损害，当台风风速在大于13m/s时，会造成较大的红树林受损面积（>50ha）。 （3）台风灾害对秋茄群落、海桑群落、海莲-尖瓣海莲-木榄群落影响较大，对红海榄群落、角果木群落、无瓣海桑群落及桐花树群落影响较小。 （4）不同分区的红树林台风综合评价指数大小依次为：道学区（2.38）>铺前区（1.89）>塔市区（1.49）>三江区（1.46）>罗豆区（1.43）。 本文基于历史数据，定量研究了红树林台风灾害影响，这可为东寨港保护区所在地红树林植被保护和恢复提供理论依据，同时为保护区红树林人工种植地理位置和物种选择提供了科学依据。这对保护区防灾减灾实际工作具有重要意义。

Mangrove is a woody biological community in tidal wetland which grows in the upper intertidal zone of tropical and subtropical coast. China's coastal wetland area has shrunk severely in recent years, especially mangrove wetlands and coral reef ecosystems. In the context of global climate change, the uncertainty of extreme weather events such as typhoons is increasing. At the same time, the effects of typhoons on coastal wetland ecosystems in tropical and temperate regions are diverse, including direct impacts (such as high winds, tsunamis, and storm surges), as well as indirect effects from typhoons (such as heavy rains and floods). The relationship between the typhoon and its accompanying disasters, as well as the complexity of the coastal wetland ecosystem itself, has also impacted on coastal wetland ecosystems complicatedly. In addition, typhoon impacts in coastal wetland ecosystems are more difficult due to the spatial and temporal uncertainties of typhoons and their path changes, as well as the challenges of the natural environment of tropical and subtropical coastal wetlands (especially in severe weather conditions). The impact of typhoons on coastal wetland plants, particularly mangroves and their restoration, has attracted people's attention. At present, countries and regions affected by tropical storms such as North America and Japan are relatively concerned. In this study, the Landsat series remote sensing data and pixel binary model were used for the study of the change of mangrove area and its spatial distribution in Dongzhaigang from 1985 to 2018. The tropical cyclone scale data were screened to construct the typhoon disaster event in Dongzhaigang from 1985 to 2016. Through the correlation analysis between the two, it is found that the interannual area change of mangroves in Dongzhaigang is negatively correlated with the maximum wind speed near the centre (MWSNC) of the typhoon in Dongzhaigang. According to this, with the time-series dataset above, EVI was used as the typhoon disturbance index to further evaluate the mangrove area after the 16 typical historical typhoon disasters in the Dongzhaigang, so as to obtain the change area of the mangrove forest before and after the typhoon disaster (i.e. the damaged area, MDA) and analysis of its spatial distribution characteristics. Based on the MDA and the MWSNC of the typhoon, the typhoon disaster intensity- MDA rate curve (Vulnerability Curve) was constructed, and then the distribution and characteristics of the typhoon disaster in Dongzhaigang were analyzed, including the Dongzhaigang mangrove division and the difference between the species and the species affected by the typhoon. The results of this study are as follows: (1) The area of mangrove forests in Dongzhaigang of Hainan Province fluctuated between 1985 and 2018. The maximum value was 1739.04ha (2018) and the minimum value was 798.93ha (1988). Before 1992, the overall growth of mangroves was poor, especially the Tashi district, Sanjiang district and the western part of Luodou district, however, the area of mangroves has increased since 1993. The area of mangroves in the Daoxue district, the eastern part of Luodou district and the Puqian district is stable. (2) The MDA based on typhoon disaster is generally distributed in the edge of the study area and close to the sea area and near the tidal creek. The correlation between MWSNC of the 16 typhoons and the corresponding MDA was analyzed. The results of Logistic fitting were the best (R2=0.6898, P<0.001). Typhoons cause greater damage to mangroves when the wind is 9-12 or higher. When the typhoon wind speed is greater than 13m/s, it will cause a large area of mangrove damage (>50ha). (3) The typhoon disaster had a great influence on the Kandelia candel community, the Sonneratia. caseolaris community, and the Bruguiera Sexangula-B. Sexangula var-B. gymnorrhiza community. Whereas, The typhoon disaster had little effect on the Rhizophora stylosa community, the Ceriops tagal community, the S. apetala community and the Aegiceras corniculatum community. (4) The order of the mangrove disaster comprehensive index in different sections is Daoxue district (2.38)> Puqian district (1.89)> Tashi district (1.49)> Sanjiang district (1.46)> Luodou district (1.43). Based on historical data, this paper quantitatively studies the impact of the typhoon on mangroves, which provides a theoretical basis for the protection and restoration of mangrove vegetation in the Dongzhaigang mangrove reserve, and provides a scientific basis for the geographical location and species selection of mangrove plantations in protected areas. This is of great significance to the work of disaster prevention and mitigation in protected areas.