نتایج جستجو برای: wetland protection
تعداد نتایج: 189592 فیلتر نتایج به سال:
Wetlands are one of the world’s three major ecosystems. They not only maintain regional ecological balance but also provide an important guarantee for human survival. Wetland ecosystem health assessment serves as foundation wetland protection, management, and restoration. In this study, method proposed by United States Environmental Protection Agency (US EPA) was selected improved to systematic...
Identifying groundwater-dependent ecosystems is the first step towards their protection. This paper presents a machine learning approach that maps by extrapolating from characteristics of small sample known wetland and non-wetland areas to find other with similar geological, hydrological biotic markers. Explanatory variables for occurrence include topographic elevation, lithology, vegetation vi...
More than 131 x 10(6) metric tons (MT) of inorganic sediments accumulated in coastal wetlands when Hurricanes Katrina and Rita crossed the Louisiana coast in 2005, plus another 281 x 10(6) MT when accumulation was prorated for open water area. The annualized combined amount of inorganic sediments per hurricane equals (i) 12% of the Mississippi River's suspended load, (ii) 5.5 times the inorgani...
Notice The material in this document has been subjected to U.S. Environmental Protection Agency (EPA) technical review and has been approved for publication as an EPA document. The information contained herein is offered to the reader as a review of the " state of the science " concerning wetland bioassessment and nutrient enrichment and is not intended to be prescriptive guidance or firm advic...
This study investigates tourist preferences and willingness to pay (WTP) for restoration of mangroves reduce the effects climate change (CC) on ecotourism at Rekawa coastal wetland, Sri Lanka, using a double bounded discrete choice elicitation format in contingent valuation method. The survey also included socio-economic, demographic, attitudinal characteristics respondents. results reveal that...
We conduct a novel meta-analysis of ecosystem service economic valuation results restricted to wetlands of the contiguous US. We focus our analysis on the estimation of benefits that wetlands contribute to water quality and flood and storm protection services. We developed a new statistical approach to enhance the accuracy and flexibility of our meta-analysis while maintaining a systematic appr...
The small playa-lakes and other saline wetlands of Monegros, scattered over a dry area with winter cereal monoculture, are threatened by the settlement of new irrigation districts and other kinds of human pressure. Enforcing the protection rules of European Union in these valuable habitats requires, first, their delimitation and monitoring. This article shows how these tasks can be undertaken u...
The applications of object-based image analysis (OBIA) in remote sensing studies of wetlands have been growing over recent decades, addressing tasks from detection and delineation of wetland bodies to comprehensive analyses of within-wetland cover types and their change. Compared to pixel-based approaches, OBIA offers several important benefits to wetland analyses related to smoothing of the lo...
Both anthropogenic activities and climate change can affect the biogeochemical processes of natural wetland methanogenesis. Quantifying possible impacts of changing climate and wetland area on wetland methane (CH4) emissions in China is important for improving our knowledge on CH4 budgets locally and globally. However, their respective and combined effects are uncertain. We incorporated changes...
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