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Advances in Remote Sensing 2016年第4期5卷 284-295页

作者： Nguyen Thi Quynh Trang Le Quang Toan Tong Thi Huyen Ai Nguyen Vu Giang Pham Viet Hoa Space Technology Institute Vietnam Academy of Science and Technology Hanoi Vietnam Ho Chi Minh Institute of Resource Geography Vietnam Academy of Science and Technology Ho Chi Minh City Vietnam

Many researches have been performed comparing object-based classification (OBC) and pixel-based classification (PBC), particularly in classifying high-resolution satellite images. VNREDSat-1 is the first optical remote sensing satellite of Vietnam with resolution of 2.5 m (Panchromatic) and 10 m (Multispectral). The objective of this research is to compare two classification approaches using VNREDSat-1 image for mapping mangrove forest in Vien An Dong commune, Ngoc Hien district, Ca Mau province. ISODATA algorithm (in PBC method) and membership function classifier (in OBC method) were chosen to classify the same image. The results show that the overall accuracies of OBC and PBC are 73% and 62.16% respectively, and OBC solved the “salt and pepper” which is the main issue of PBC as well. Therefore, OBC is supposed to be the better approach to classify VNREDSat-1 for mapping mangrove forest in Ngoc Hien commune.

关键词： Object-Based Classification Pixel-Based Classification VNREDSat-1 mangrove forest Ca Mau

Review on Possible Factors for Outbreak of Wood Boring Isopod, Sphaeroma spp. Which Causes Destructive Impact on mangrove forest in China

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Open Journal of Ecology 2022年第3期12卷 211-235页

作者： Myat Thiri Yunan Yang School of Space and Environment Beihang University Beijing China Biotechnology Research Department Ministry of Education Naypyidaw Myanmar

The tropical and subtropical mangrove biomes form the foundation of a highly productive and biologically rich ecosystem providing essential goods and services to human beings. Despite its values, the stability and survival of mangroves are consistently threatened by anthropogenic activities and their associated degradation, resulting in their disappearance. After realizing their ecological importance, in recent years, rehabilitation and restoration programs for mangrove forests have been launched globally. Unfortunately, most mangrove restoration efforts yielded negative results and failed to re-establish mangrove forests because of technical and social failures. Besides, the continued outbreak of wood borer, Sphaeroma spp., in mangrove forests has become one of the destructive causes of natural and restored mangrove forests in some nations including China. However, few studies on the biology of Sphaeroma spp. found in Chinese mangrove ecosystem have been done, and little is known concerning the factors affecting their outbreak in China. In this review, we discussed the possible factors that affect the rapid growth and recruitment of Sphaeroma spp. in the mangrove ecosystem by examining the information of the wood borer Sphaeroma spp. from the scattered pieces of literature with great regard. We discussed the relationship between the recruitment of Sphaeroma spp. and the tide and flow of water, food availability from the surrounding water and water quality including salinity, temperature, and the pollution of water. In addition to these factors, the reduced biodiversity of restored mangrove forest could be one of the main reasons for the outbreak of isopod. We also discussed the destructive impact of the isopod’s outbreak and the possible ways to control their outbreak in mangrove forest.

关键词： Isopod’s Outbreak Sphaeroma Species Destructive Impact mangrove forest Restoration

Comparison of Water Quality Status of Disturbed and Undisturbed mangrove forest at Awat-Awat Lawas Sarawak

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Open Journal of forestry 2016年第1期6卷 14-18页

作者： Seca Gandaseca Nur Liyana Abd Wahab Ahmad M. M. Pazi Noraini Rosli Pakhriazad Hassan Zaki Department of forest Production Faculty of Forestry Universiti Putra Malaysia Serdang Malaysia Faculty of Agriculture and Food Sciences Universiti Putra Malaysia Bintulu Sarawak Campus Bintulu Malaysia Department of forest Management Faculty of Forestry Universiti Putra Malaysia Serdang Malaysia

Water quality testing was compulsory for management of safe and reliable water sources. Various sources of pollution and destruction of mangrove forest decrease the quality of river water. Thus a study was conducted to determine the water quality status of mangrove forest river water of Awat-Awat Lawas Sarawak and compare the water quality status of disturbed and undisturbed mangrove forest river in that area. Samples from twelve sampling stations were collected from both mangrove forest river from October 2013 to March 2014. In-situ data collected (pH, temperature, dissolved oxygen (DO), salinity, turbidity, total dissolved solid (TDS), conductivity) and laboratory analysis (biochemical oxygen demand (BOD), chemical oxygen demand (COD), ammoniacal nitrogen (AN), total suspended solid (TSS)) were conducted according to the Standard method of Examination of Water and Wastewater AHPA 2005. Six water parameters: pH, DO, BOD, COD, AN and TSS value were used in calculating the Water Quality Index (WQI). Mean values for disturbed area were follows, pH (7.07), temperature (29.93°C), salinity (15.64 PSU), turbidity (55.13 NTU), DO (4.59 mg/L), BOD (0.73 mg/L), COD (10.16 mg/L), AN (0.14 mg/L), TSS (53.92 mg/L), TDS (23.14 mg/L) and conductivity (2.61 ms/m). Undisturbed area results were, pH (6.84), temperature (28.32°C), salinity (14.65 PSU), turbidity (35.41 NTU), DO (2.39 mg/L), BOD (0.55 mg/L), COD (15.82 mg/L), AN (0.13 mg/L), TSS (53.23 mg/L), TDS (22.82 mg/L) and conductivity (2.34 ms/m). There were no significant differences between two locations except for DO. Both water qualities of disturbed and undisturbed mangrove forest river were found under Class III, which describe that the water bodies are in moderate quality status.

关键词： Water Quality Index (WQI) mangrove forest Sarawak Malaysia Disturbed Undisturbed

Potential effects of sea level rise on the soil-atmosphere green-house gas emissions in Kandelia obovata mangrove forests

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Acta Oceanologica Sinica 2023年第4期42卷 25-32页

作者： Jiahui Chen Shichen Zeng Min Gao Guangcheng Chen Heng Zhu Yong Ye Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems College of the Environment and EcologyXiamen UniversityXiamen 361102China Third Institute of Oceanography Ministry of Natural ResourcesXiamen 361005China Fujian Provincial Station for Field Observation and Research of Island and Coastal Zone in Zhangzhou Xiamen 361005China

mangrove forests are under the stress of sea level rise(SLR)which would affect mangrove soil *** soils are important sources of soil-atmosphere greenhouse gas(GHG)emissions,including carbon dioxide(CO_(2)),methane(CH_(4))and nitrous oxide(N_(2)O).Understanding how SLR influences GHG emissions is critical for evaluating mangrove blue carbon *** this study,potential effects of SLR on the GHG emissions were quantified through static closed chamber technique among three sites under different intertidal elevations,representing tidal flooding situation of SLR values of 0 cm,40 cm and 80 cm,*** with Site SLR 0 cm,annual CO_(2) and N_(2)O fluxes decreased by approximately 75.0%and 27.3%due to higher soil water content,lower salinity and soil nutrient environments at Site SLR 80 ***,CH_(4) fluxes increased by approximately 13.7%at Site SLR 40 cm and 8.8%at Site SLR 80 cm because of lower salinity,higher soil water content and soil ***_(2)-equivalent fluxes were 396.61 g/(m^(2)·a),1423.29 g/(m^(2)·a)and 1420.21 g/(m^(2)·a)at Sites SLR 80 cm,SLR 40 cm and SLR 0 cm,*** Site SLR 0 cm to Site SLR 80 cm,contribution rate of N_(2)O and CH_(4) increased by approximately 7.42%and 3.02%,while contribution rate of CO_(2) decreased by approximately 10.44%.The results indicated that warming potential of trace CH_(4) and N_(2)O was non-negligible with *** effects of SLR on the mangrove blue carbon capability should warrant attention due to changes of all three greenhouse gas fluxes with SLR.

关键词： carbon dioxide methane nitrous oxide CO_(2)-equivalent fluxes sea level rise mangrove forest

Study on the Establishment of Demonstration Site for Peatland Conservation through Integrated Management and Sustainable Utilization of Non-timber forest Products(NTFPs)

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Journal of Agricultural Science and Technology(A) 2024年第2期14卷 93-106页

作者： Sann Lwin Mya Win Myint Myint Khaing Tin Maung Htun Soe Min Ye Wunna Soe forest Resource Environment Development and Conservation Association(FREDA)

A participatory action research was conducted in 2022,with the“Establishment of Demonstration Site for Peatland Conservation through Integrated Management and Sustainable Utilization of Non-Timber forest Products(NTFPs)”to give recommendation on the development of guidelines on Sustainable Utilization of Non-Timber forest Products(NTFPs)and peatland *** to the peat soil assessment,it was found that peat soil content was very low and top soil was thin under the mangrove forest,and Payena paralleloneura-Kan Zaw bearing forest in March *** material might be pressed by trespasser to collect Kan Zaw seed,to conduct horticulture and mining near the Kan Zaw bearing forest,or organic material might be damaged by burning with controlled fire in the previous years,under Kan Zaw trees to collect *** material might have been carried to the downwards with running water due to the heavy rainfall,with 4,700 mm/*** forest and Kan Zaw bearing evergreen forest can be assumed as“the major source of coastal peatland formation,with peat deposits eroded seawards”.It is assumed that the organic material will accumulate on top of the sands and it will lead to the formation of the peatland at coastal *** can be assumed that the accumulation of organic material found in mangrove forest and evergreen forests will promote the soil carbon storage,if we can adopt the ASEAN Policy on Zero Burning,which reflect ASEAN's commitment to controlling fires and haze,offering techniques,benefits,requirements,and challenges for implementing zero burning practices[1].Sustainable utilization of NTFP including peat and Kan Zaw-Payena paralleloneura Kurz seed was studied at demonstration sites,and it is recommended to make a trial on silvicultural system at mangrove forest and apply suitable silvicultural system such as Clear-Felling(in blocks or in alternate strips)system,Selection System,and Shelter Wood System to ensure the sustainable utilization of NTFP

关键词： Silvicultural system mangrove forest moist evergreen forest peat soil Kan Zaw-Payena paralleloneura Kurz seed

Spatial Zonation and Diversity of Bivalves and Gastropods in mangrove forests of Casiguran, Aurora, Philippines

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Open Journal of Ecology 2021年第10期11卷 645-663页

作者： Maria Cristina B. Cañada Eutiquio L. Rotaquio, Jr. RB J. Gallego Department of Graduate Studies Aurora State College of Technology Baler Aurora Philippines

This study generally aimed to determine the spatial zonation and diversity of bivalves and gastropods in mangrove forest of Cozo, Esteves and Tinib in Casiguran, Aurora. Specifically, this aimed to determine the species composition and distribution, and determine the relationship between spatial zonation and diversity of bivalves and gastropods as influenced by ecological factors such as vegetation, soil texture, organic matter, soil salinity, and soil pH. A total of 22 taxa comprising eight species of bivalves and 14 species of gastropods were identified. The high tidal zone of Esteves had high diversity (0.66) of bivalve species compared to other tidal zones and areas. On the other hand, the diversity of gastropods was almost equal in the middle tidal zones of Cozo (0.60), Esteves (0.57), and Tinib (0.42). In terms of bivalve species’ density and abundance, Dendostrea folium was the most dense and abundant in the low tidal zone of Cozo (253,333 ind.ha−1 or 25 ind.m2-1, 97.44%) while Gafrarium tumidum in the low tidal zones of Esteves (46,666 ind.ha−1 or 4 ind.m2-1, 73.68%) and Tinib (126,666 ind.ha−1 or 12 ind.m2-1, 50%). In terms of gastropod species’ density and abundance, Cerithidea cingulata was the most dense and abundant in the low tidal zone (666,666 ind

Species Richness and Abundance of Bivalves and Gastropods in mangrove forests of Casiguran, Aurora, Philippines

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Open Journal of Ecology 2020年第12期10卷 778-787页

作者： Maria Cristina B. Cañada Research and Development Services Office Aurora State College of Technology Baler Aurora Philippines

The diversity and abundance of bivalves and gastropods were studied from April to July 2015. Two sampling stations, Tinib and Esteves, in Casiguran, Aurora were selected based on the presence of mangrove forest, bivalves, gastropods, muddy substrate, and gleaners for the establishment of a transect line. Each station was laid with 100 meters transect line overlaid continuously with 2 m × 2 m quadrat along each transect. A total of 50 sampling units covering 0.02 ha area per sampling station were surveyed. The transect line recorded six species of bivalves distributed among five families and 12 species of gastropods belonging to eight families. Three species of bivalves and five species of gastropods were common to both sampling stations. However, Tinib station had most diverse species of bivalves (0.55) while Esteves station had most diverse species of gastropods (0.43). Both stations revealed Dendrostrea folium (43%) (bivalve) and Cerithidea cingulata (93%) (gastropods) as most frequently occurring species. Dendostrea folium also emerged as the densest (10,640 ind∙ha−1 and 6850 ind∙ha−1) and most abundant (58.52% and 77.84%) bivalve species. For gastropods, Terebralia sulcata (249,250 ind∙ha−1) was the densest and most abundant (96.97%) in Tinib while Terebralia palustris was the densest (747,050 ind∙ha−1) and most abundant (70.44%) in Esteves. Pooled results for bivalve species maintained Dendrostrea folium as the densest (8750 ind∙ha

Biomass accumulation and organic carbon stocks of Kandelia obovata mangrove vegetation under different simulated sea levels

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Acta Oceanologica Sinica 2022年第8期41卷 78-86页

作者： Jiahui Chen Min Gao Guangcheng Chen Heng Zhu Yong Ye Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems College of the Environment and EcologyXiamen UniversityXiamen 361102China Third Institute of Oceanography Ministry of Natural ResourcesXiamen 361005China Fujian Provincial Station for Field Observation and Research of Island and Costal Zone in Zhangzhou Xiamen 361005China

mangrove forests are vulnerably threatened by sea level rise(SLR).Vegetation organic carbon(OC)stocks are important for mangrove ecosystem carbon *** is critical to understand how SLR affects vegetation OC stocks for evaluating mangrove blue carbon budget and global climate *** this study,biomass accumulation and OC stocks of mangrove vegetation were compared among three 10 year-old Kandelia obovata(a common species in China)mangrove forests under three intertidal elevations through species-specific allometric *** study simulated mangrove forests with SLR values of 0 cm,40 cm and 80 cm,respectively,representing for the current,future~100 a and future~200 a SLR of mangrove forests along the Jiulong River Estuary,*** directly decreased mangrove individual density and inhibited the growth of mangrove *** total vegetation biomasses were(12.86±0.95)kg/m^2,(7.97±0.90)kg/m^2 and(3.89±0.63)kg/m^2 at Sites SLR 0 cm,SLR40 cm and SLR 80 cm,*** total vegetation OC stock decreased by approximately 3.85 kg/m^2(in terms of C)from Site SLR 0 cm to Site SLR 80 *** lower vegetation biomass and OC stock of various components(stem,branch,leaf and root)were found at Site SLR 80 *** increments of vegetation biomass and OC stock also decreased with SLR ***,significant lower sedimentation rate was found at Site SLR 80 *** indicated that SLR will decrease mangrove vegetation biomass and OC stock,which may reduce global blue carbon sink by mangroves,exacerbate global warming and give positive feedback to SLR.

关键词： sea level rise vegetation biomass organic carbon stock component mangrove forest Kandelia obovata

Comparative and Prospective Evaluation of the Carbon Potential of the mangrove of the Sine-Saloum Delta (Senegal) from 2016 to 2021

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American Journal of Plant Sciences 2023年第9期14卷 994-1008页

作者： Salimata Mouhamad Diop Massamba Thiam Ousmane Ndiaye Saliou Ndiaye Cherif Cisse Ecole Nationale Supérieure d’Agriculture Université Iba Der Thiam de Thiès Thiès Senegal Direction des Eaux et Forêts Chasses et Conservation des Sols Dakar Senegal Association Pour la Promotion des Initiatives Locales Dakar Senegal

With the rupture of the Sangomar spit and climate change, ecosystem functions such as carbon absorption and storage by the Saloum Delta Biosphere Reserve are threatened. Initiatives are carried out as a response to the degradation of the mangrove ecosystem, such as the PRECEMA project. To measure its impact, an assessment of the carbon potential of the mangrove was conducted in 2016 on permanent plots. The present study is part of the monitoring of carbon potential. It aims to contribute to the updating of information on the evaluation of carbon storage potential. The method “afforestation and reforestation of degraded mangrove habitats on a large scale CDM or AR-AM0014 version 04.0” was applied. The mangrove vegetation assessed is dominated by Rhizophora racemosa with 69.9% of the total. With a relatively bushy habit (height = 1.91 m), the height distribution shows a right skewness (Skewness = 2.17;Kurtosis = 4.07) with a tail containing more observations than a normal distribution. The distribution is observed for diameters is skewed with Skewness = 1.5 but Kurtosis = 2.3. Thus the stand is young with an average diameter of 3.90 cm and 79.6% of the trees have a diameter 5 cm. The annual increase in carbon potential of the mangrove has decreased by 80% in 5 years (2016 assessment - 2021 assessment). For a 15-year period, the total carbon stock projected by the model increases globally from 201.396 TeqCO2 in 2011 to 277,318 TeqCO2 in 2026. The projections showed an overall annual stock decrease of 14,164 TeqCO2 (94%). For 2021, the total projected stock (270.289 TeqCO2) is slightly higher than the assessed stock (251.059 TeqCO2), a difference of 7%. Also, the projected annual carbon stock for 2021 (2844 TeqCO2) is higher than the assessed stock (1353 TeqCO2), a gap of 52%.

关键词： Carbon Sequestration mangrove forest Sangomar

Sonneratia apetala Buch. Ham in mangrove ecosystem of China: An invasive species or restoration species?

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Sonneratia apetala Buch. Ham in mangrove ecosystem of China:...