• 제목/요약/키워드: coastal wetland

검색결과 129건 처리시간 0.027초

갯벌생태관광에 대한 소비자의 잠재가치 측정에 관한 연구 (Analyzing Consumer's Preference for the Potential Value of Coastal Wetland Ecotourism Using Contingent Choice Method)

  • 장정인;이주석;신철오
    • Ocean and Polar Research
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    • 제33권2호
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    • pp.149-157
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    • 2011
  • As tourist are becoming increasingly environmentally conscious, government and related companies need to establish policies or strategies that encourage ecotourism. The aim of this study is to analyze individual preferences and estimate shadow prices, namely, willingness to pay for coastal wetland ecotourism. This study applies a contingent choice method to measuring marginal WTP for each attribute (tour duration, number of visitors, guide, program) of coastal wetland ecotourism. The finding herein contribute to complementing the valuation methods by estimating various attributes of coastal wetland ecotourism and providing policy-makers with useful methodological framework and quantitative information in the decision-making process related to ecotourism.

시화호 연안습지 식생의 공간 분포 분석 (The Spatial Distribution Analysis of Coastal Wetland Vegetation in Sihwa Lake)

  • 정종철;조홍래
    • 환경영향평가
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    • 제17권2호
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    • pp.105-112
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    • 2008
  • Human activity has been the major threat to wetlands. Agriculture, industrial development, and urban and suburban sprawl have caused the greatest losses of coastal wetlands. In fact, riceland agriculture, because of the flooding that goes with it, provides some additional wetland habitat not otherwise available. The biggest current source of loss for freshwater coastal wetlands is from urban sprawl. In this study, spatial analysis method such as landscape index were applied to Sihwa area in Ansan city. The SMA (Spectral Mixture Analysis) method using Landsat image showed the change distribution of wetland vegetation from 1996 to 2004. The southern part of Sihwa wetland have been changed with Suda japonica of 24% and reed vegetation of 34% on coastal wetland which were covered with tidal flat.

갯벌과 간척농지의 수질 및 대기조절가치의 비교분석 (A Comparative Analysis of the Functional Values for Wastewater Treatment and Atmospheric Regulation in Coastal Wetland and Rice Paddy Ecosystems)

  • 표희동
    • 자원ㆍ환경경제연구
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    • 제10권1호
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    • pp.95-126
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    • 2001
  • Functional values for wastewater treatment and atmospheric regulation in coastal wetland and rice paddy ecosystems are quantified, and an illustration is given on how to integrate biophysical parameters into a valuation framework. This is one of most controversial issues in economic analysis for wetland preservation versus wetland conversion to agricultural use. This paper includes theoretical considerations for estimating functional values of environmental ecosystems, and the integration of biophysical data and replacement cost method employed. Specific physical and geographical characteristics and data on ecosystem functions and services in coastal wetlands and rice paddies are addressed for evaluating their values in economic terms. In particular this paper indicates double counting problems and overestimation in the previous studies, and demonstrates how to avoid them and to maintain the consistency of valuation process involving a least-cost method, thus enables an accurate integration of the coastal wetland ecology and wetland economics. As a result which is far away from the previous studies, the total economic present value of wastewater assimilation by coastal wetland is estimated at 7,484,640 won/ha, and the net present value of positive effect for atmospheric regulation, negative effects for air pollution and water pollution by rice paddy is estimated at -37,934 won/ha, assuming that resources are infinitely long-lived and the annual value and the rate of discount (10%) is constant every year. In conclusion, for further reliability and validity of functional values for natural resources it is very noteworthy that a general equilibrium framework that could directly incorporate the interdependence between ecosystem functions and services would be preferred to the partial equilibrium framework.

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Integration of ERS-2 SAR and IRS-1 D LISS-III Image Data for Improved Coastal Wetland Mapping of southern India

  • Shanmugam, P.;Ahn, Yu-Hwan;Sanjeevi, S.;Manjunath, A.S.
    • 대한원격탐사학회지
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    • 제19권5호
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    • pp.351-361
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    • 2003
  • As the launches of a series of remote sensing satellites, there are various multiresolution and multi-spectral images available nowadays. This diversity in remotely sensed image data has created a need to be able to integrate data from different sources. The C-band imaging radar of ERS-2 due to its high sensitivity to coastal wetlands holds tremendous potential in mapping and monitoring coastal wetland features. This paper investigates the advantages of using ERS-2 SAR data combined with IRS-ID LISS-3 data for mapping complex coastal wetland features of Tamil Nadu, southern India. We present a methodology in this paper that highlights the mapping potential of different combinations of filtering and integration techniques. The methodology adopted here consists of three major steps as following: (i) speckle noise reduction by comparative performance of different filtering algorithms, (ii) geometric rectification and coregistration, and (iii) application of different integration techniques. The results obtained from the analysis of optical and microwave image data have proved their potential use in improving interpretability of different coastal wetland features of southern India. Based visual and statistical analyzes, this study suggests that brovey transform will perform well in terms of preserving spatial and spectral content of the original image data. It was also realized that speckle filtering is very important before fusing optical and microwave data for mapping coastal mangrove wetland ecosystem.

환경지표를 이용한 연안습지의 평가 (Evaluation of Coastal Wetland to use Environmental Indicators)

  • 윤소원;이동근
    • 한국농촌계획학회:학술대회논문집
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    • 한국농촌계획학회 1998년도 정기총회 및 춘계 학술논문발표회
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    • pp.21-24
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    • 1998
  • The objective of this study is to enforce systematic evaluation on the present condition and ecosystem of coastal wetland to use frame of environmental indicators. For this, the indicators for evaluation of coastal wetland are established and are applied to the present condition. Then, the application possibility of this evaluation indicators and management method by group of coastal method are presented.

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한국 서남해안 습지의 식물 군집에 미치는 토양요인 (Soil Factors Affecting the Plant Communities of Wetland on Southwestern coast of Korea)

  • 임병선;이점숙
    • The Korean Journal of Ecology
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    • 제21권4호
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    • pp.321-328
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    • 1998
  • To describe the major environmental factors operating in coastal wetland and to characterize the distribution of the plant species over the wetland in relation to the major environmental gradients, 12 soil physical and chemical properties were determined. The gradient of water and osmotic potential of soil, electrical conductivity, sodium and chloride content and soil texture alsong the three habitat types of salt marshes, salt swamp and sand dune were occurred. The 24 coastal plant communities from principal component analysis (PCA) on the 12 variables were at designated as a gradient for soil texture and water potential related with salinity by Axis I and as a gradient for soil moisture and total nitrogen gradient by Axis II On Axis I were divided into 3 groups (1) 9 salt marsh communities including Salicornia herbacea communities (2) 5 salt swamp communities including Scirpus fluviatilis communities and (3) 10 sand dune communities including Jmperata cylindrica communities on Axis II were divided into 2 groups (1) salt marsh and sand dune communities, and (2) 3 salt swamp communities. The results could account for the zonation of plant communities on coastal wetland observed alsong envionmental gradients.

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Mitochondrial OXPHOS genes provides insights into genetics basis of hypoxia adaptation in anchialine cave shrimps

  • Guo, Huayun;Yang, Hao;Tao, Yitao;Tang, Dan;Wu, Qiong;Wang, Zhengfei;Tang, Boping
    • Genes and Genomics
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    • 제40권11호
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    • pp.1169-1180
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    • 2018
  • Cave shrimps from the genera Typhlatya, Stygiocaris and Typhlopatsa (TST complex) comprises twenty cave-adapted taxa, which mainly occur in the anchialine environment. Anchialine habitats may undergo drastic environmental fluctuations, including spatial and temporal changes in salinity, temperature, and dissolved oxygen content. Previous studies of crustaceans from anchialine caves suggest that they have possessed morphological, behavioral, and physiological adaptations to cope with the extreme conditions, similar to other cave-dwelling crustaceans. However, the genetic basis has not been thoroughly explored in crustaceans from anchialine habitats, which can experience hypoxic regimes. To test whether the TST shrimp-complex hypoxia adaptations matched adaptive evolution of mitochondrial OXPHOS genes. The 13 OXPHOS genes from mitochondrial genomes of 98 shrimps and 1 outgroup were examined. For each of these genes was investigated and compared to orthologous sequences using both gene (i.e. branch-site and Datamonkey) and protein (i.e. TreeSAAP) level approaches. Positive selection was detected in 11 of the 13 candidate genes, and the radical amino acid changes sites scattered throughout the entire TST complex phylogeny. Additionally, a series of parallel/convergent amino acid substitutions were identified in mitochondrial OXPHOS genes of TST complex shrimps, which reflect functional convergence or similar genetic mechanisms of cave adaptation. The extensive occurrence of positive selection is suggestive of their essential role in adaptation to hypoxic anchialine environment, and further implying that TST complex shrimps might have acquired a finely capacity for energy metabolism. These results provided some new insights into the genetic basis of anchialine hypoxia adaptation.

국내 연안습지 보전 정책의 법제도적 한계와 개선방향 고찰 (Study on the Institutional Limitations and Improvements for Effective Management of Coastal Wetlands)

  • 육근형
    • 한국습지학회지
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    • 제15권4호
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    • pp.477-484
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    • 2013
  • 우리나라는 1999년 람사르 협약의 국내이행을 위하여 "습지보전법"을 제정하여 환경부와 해양수산부가 각각 내륙습지와 연안습지를 관리하고 있다. 연안습지는 2001년 무안갯벌을 습지보호지역으로 지정하기 시작하여, 2013년 6월 기준으로 총 12개 지역, $218.96km^2$을 습지보호지역으로 지정하였다. 제도가 도입된 지 10년이 지나면서 보호지역 지정 면적이 늘어나는 외형적 성과를 거두었으나, 한편에서는 습지 보전정책이 효과적으로 이행되는지에 대한 의문이 제기되기도 한다. 이 연구에서는 습지 관련 법률과 제도에서 나타나는 문제점을 분석하고, 연안습지 보전 정책의 효과적인 이행을 위한 정책개선방향을 제시하고자 한다.

환경지표를 이용한 연안습지의 평가 (Evaluating Coastal Wetland Using Environmental Indicators)

  • 이동근;방광자
    • 농촌계획
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    • 제4권2호
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    • pp.70-78
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    • 1998
  • The objective of this study was to enforce systematic evaluation on the present condition and ecosystem of coastal wetland to use frame of environmental indicators, For this, the indicators for evaluation of coastal wetland were established and were applied to the present condition. Then, the application possibility of this evaluation indicators and management method by group of coastal method are presented. These results present the following consideration in case that the ideal management method on the conservation and development of coastal wetlands was proposed. In case of Kang-hwa island which had the good natural environment, the mlnimum development with maintenance of the present state must be driven. In case of Tae-an which had the good natural environment and development potential, the development that was in harmony with the nature must to be driven. In case of Seo-chon which was previously developed region, the various development programs which had the minimum effects on the natural, living and socio $.$ economic environment must to be provided.

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