深圳红树林湿地的现状及生态旅游开发对策   总被引：9，自引：1，他引：8  

胡卫华 《湿地科学与管理》2007,3(1):52-55

红树林是生长在热带和亚热带沿海潮间带的木本植物群落,有其独特的生态系统。它具有极其重要的生态、社会和经济效益,同时也是一种新兴的生态旅游资源。介绍了深圳红树林湿地的现状、面临的主要威胁,并结合实际情况对开发红树林生态旅游提出了建议。  相似文献   

Dynamics of wood fall colonization in relation to sulfide concentration in a mangrove swamp     

《Marine environmental research》2013

Wood debris are an important component of mangrove marine environments. Current knowledge of the ecological role of wood falls is limited by the absence of information on metazoan colonization processes over time. The aim of this study was to provide insights to their temporal dynamics of wood eukaryotic colonization from a shallow water experiment in a mangrove swamp. Combined in situ chemical monitoring and biological surveys revealed that the succession of colonizers in the mangrove swamp relates with the rapid evolution of sulfide concentration on the wood surface. Sulfide-tolerant species are among the first colonizers and dominate over several weeks when the sulfide content is at its maximum, followed by less tolerant opportunistic species when sulfide decreases. This study supports the idea that woody debris can sustain chemosynthetic symbioses over short time-scale in tropical shallow waters.  相似文献   

Discrimination of mangrove forests and characterization of adjoining land cover classes using temporal C-band Synthetic Aperture Radar data: A case study of Sundarbans     

《International Journal of Applied Earth Observation and Geoinformation》2013

C-band dual polarization (HH, HV) Synthetic Aperture Radar (SAR) data from Radarsat-2 were used to discriminate and characterize mangrove forests of the Sundarbans. Multi-temporal data acquired during winter and rainy seasons were analysed for the segregation of mangrove forest area. A decision rule based classification involving combination of three-date HH (range −11 to −2 dB) with single-date cross-polarization ratio (2–8) was applied on the datasets for discriminating mangrove forests from other land cover classes. Application of textural measures (entropy and angular second moment) in the aforesaid decision rule based classification produced three broad homogeneous mangrove classes. The area covered by the most homogeneous class increased from January to March and decreased from July to September, and correlated well to the change in the phenological status of the mangroves. Extent of homogeneous areas was more in the eastern region of the Sundarbans than that of the central and western side. Thus, the study revealed that textural measures combined with multi-temporal HH backscatter and single-date cross-polarization ratio in a decision rule classification could be satisfactorily used for characterization of the mangrove forests.  相似文献   

海南东寨港红树林生态旅游及环境教育     

张琳婷  陶伊佳  王文卿 《湿地科学与管理》2014,(3):31-34

通过对红树林资源最丰富的东南亚国家及我国香港和台湾红树林生态旅游现状调查,总结了红树林生态旅游及环境教育的特点、成功案例和创新理念。在海南国际旅游岛开发及《海口市人民代表大会常务委员会关于加强东寨港红树林湿地保护管理的决定》的大背景下,结合海南岛和海口市的实际情况,以海南东寨港红树林为对象,提出红树林生态旅游可行性建议,完善我国红树林生态旅游的发展模式。  相似文献   

Groundwater residence time in a dissected and weathered sandstone plateau: Kulnura–Mangrove Mountain aquifer,NSW, Australia     

D. I. Cendón  S. I. Hankin  J. P. Williams  M. Van der Ley  M. Peterson  C. E. Hughes 《Australian Journal of Earth Sciences》2014,61(3):475-499

Groundwater residence time in the Kulnura–Mangrove Mountain aquifer was assessed during a multi-year sampling programme using general hydrogeochemistry and isotopic tracers (H₂O stable isotopes, δ¹³C_DIC, ³H, ¹⁴C and ⁸⁷Sr/⁸⁶Sr). The study included whole-rock analysis from samples recovered during well construction at four sites to better characterise water–rock interactions. Based on hydrogeochemistry, isotopic tracers and mineral phase distribution from whole-rock XRD analysis, two main groundwater zones were differentiated (shallow and deep). The shallow zone contains oxidising Na–Cl-type waters, low pH, low SC and containing ³H and ¹⁴C activities consistent with modern groundwater and bomb pulse signatures (up to 116.9 pMC). In this shallow zone, the original Hawkesbury Sandstone has been deeply weathered, enhancing its storage capacity down to ～50 m below ground surface in most areas and ～90 m in the Peats Ridge area. The deeper groundwater zone was also relatively oxidised with a tendency towards Ca–HCO₃-type waters, although with higher pH and SC, and no ³H and low ¹⁴C activities consistent with corrected residence times ranging from 11.8 to 0.9 ka BP. The original sandstone was found to be less weathered with depth, favouring the dissolution of dispersed carbonates and the transition from a semi-porous groundwater media flow in the shallow zone to fracture flow at depth, with both chemical and physical processes impacting on groundwater mean residence times.

Detailed temporal and spatial sampling of groundwater revealed important inter-annual variations driven by groundwater extraction showing a progressive influx of modern groundwater found at >100 m in the Peats Ridge area. The progressive modernisation has exposed deeper parts of the aquifer to increased NO₃^? concentrations and evaporated irrigation waters. The change in chemistry of the groundwater, particularly the lowering of groundwater pH, has accelerated the dissolution of mineral phases that would generally be inactive within this sandstone aquifer triggering the mobilisation of elements such as aluminium in the aqueous phase.  相似文献   

雷州半岛红树林海区的软体动物   总被引：3，自引：0，他引：3  

韩维栋  蔡英亚  刘劲科  劳赞  栗志民  罗远谋 《广东海洋大学学报》2003,23(1):1-7

2 0 0 2年 7～ 9月 ,对雷州半岛主要红树林区的软体动物进行调查 ,计有 110种 ,隶属 3纲、6亚纲、12目、37科、75属 ,主要为亚热带海岸区系种类。其中全国沿海广泛分布的暖水种有 36种 ,占 32 .8% ;分布于东、南沿海的暖水种有 6 0种 ,占 5 4.3% ;分布于南海的暖水种有 13种 ,占 11 8% ;1种外来种 ,占 0 .9% ;具有较高经济和可以开发利用的贝类约占总数的 1/2。由于人为过度采捕和环境污染严重 ,部分软体动物资源已遭到破坏 ,因此 ,急需加强红树林区生态保护和环境污染整治。  相似文献   

福建宁德市红树林资源现状与保护   总被引：1，自引：0，他引：1  

陈文杰 《湿地科学与管理》2009,5(2)

2005年8-10月,我们对宁德市滨海湿地及红树林资源进行了全面系统的调查。调查表明:宁德市滨海湿地及红树林资源较为丰富,现有秋茄林面积为93.2hm2,是福建省红树林资源的重要分布区;但同时亦存在红树林面积逐年下降,天然林比重下降、人工林比重上升,林分质量,郁闭度等级、树高等级、集约度、树龄等都有所下降的现象,红树林仅为上世纪70年代末的13%左右。为此,制定湿地及红树林保护法规,拟订和实施红树林保护恢复与发展规划,提高造林和管护成效,实施抢救性保护已是当务之急。  相似文献   

The impact of shrimp farming effluent on bacterial communities in mangrove waters, Ceará, Brazil     

Sousa OV  Macrae A  Menezes FG  Gomes NC  Vieira RH  Mendonça-Hagler LC 《Marine pollution bulletin》2006,52(12):1725-1734

The effects of shrimp farm effluents on bacterial communities in mangroves have been infrequently reported. Classic and molecular biology methods were used to survey bacterial communities from four mangroves systems. Water temperature, salinity, pH, total heterotrophic bacteria and maximum probable numbers of Vibrio spp. were investigated. Genetic profiles of bacterial communities were also characterized by polymerase chain reaction (PCR) amplification of eubacterial and Vibrio 16S rDNA using denaturing gradient gel electrophoresis (DGGE). Highest heterotrophic counts were registered in the mangrove not directly polluted by shrimp farming. The Enterobacteriaceae and Chryseomonas luteola dominated the heterotrophic isolates. Vibrio spp. pathogenic to humans and shrimps were identified. Eubacterial genetic profiles suggest a shared community structure independent of mangrove system. Vibrio genetic profiles were mangrove specific. Neither microbial counts nor genetic profiling revealed a significant decrease in species richness associated with shrimp farm effluent. The complex nature of mangrove ecosystems and their microbial communities is discussed.  相似文献   

Biodiversity and its conservation in the Sundarban Mangrove Ecosystem   总被引：1，自引：0，他引：1  

Brij Gopal  Malavika Chauhan 《Aquatic Sciences - Research Across Boundaries》2006,68(3):338-354

  相似文献   

Fate of polycyclic aromatic hydrocarbon (PAH) contamination in a mangrove swamp in Hong Kong following an oil spill     

Ke L  Wong TW  Wong YS  Tam NF 《Marine pollution bulletin》2002,45(1-12):339-347

The fate of polycyclic aromatic hydrocarbon (PAH) contamination in a mangrove swamp (Yi O) in Hong Kong after an oil spill accident was investigated. The concentrations and profiles of PAHs in surface sediments collected from five quadrats (each of 10 m×10 m) covering different degrees of oil contamination and the most contaminated mangrove leaves were examined in December 2000 (30 days after the accident) and March 2001 (126 days later). The concentrations of total PAHs in surface sediments ranged from 138 to 2135 ng g⁻¹, and PAHs concentrations decreased with time. In the most contaminated sediments, total PAHs dropped from 2135 (30 days) to 1196 ng g⁻¹ (120 days), and the decrease was smaller in less contaminated sediments. The percentage reduction in sediment PAHs over three months (44%) was less significant than that in contaminated leaves (85%), indicating PAH in or on leaves disappeared more rapidly. The PAH profiles were very similar in sediments collected from quadrats Q1 and Q2 with benzo[a]anthracene and pyrene being the most abundant PAH compounds, but were different in the other three quadrats. The proportion of the light molecular weight PAHs to total PAHs increased after three months, especially phenanthrene. Results suggest that physical and photo-chemical weathering (tidal washing and photo-oxidation) of crude oil in surface sediments and on plant leaves were important processes in the first few months after the oil spill. The PAH contamination in Yi O swamp came from both petrogenic and pyrolytic sources. The petrogenic characteristic in the most contaminated sediment was confirmed with high values of phenanthrene to anthracene ratio (>10) and low values of fluoranthene to pyrene ratio (0.3–0.4).  相似文献