نتایج جستجو برای: wetland
تعداد نتایج: 10233 فیلتر نتایج به سال:
Inland wetlands are of the most important natural terrestrial types of water resources. Against its importance in protecting and improving biodiversity, air quality and macro-climatic condition of their regions, industrial development, and urbanization treat their natural existence and behavior. Therefore, monitoring and quality evaluation of wetlands are necessary to analyze and infer their na...
International Shadegan wetland is the one of large Iranian wetlands. This wetland is located in south west Iran in Khuzestan province. Dams construction and not observing of wetland water needs, breeding fish, Saccharum industry sewages, oil pipes crossing, activity of 30 petrochemical unit and urban wastes discharge, entered this unique wetland, from 1992 in red list of international wetlands ...
Wetlands serve an important purpose in flood control and water quality, but constructed-wetland sites also provide habitats for mosquito breeding. Communities near constructed-wetland sites often raise a "mosquito" objection when constructed wetlands are proposed. Wildlife and wetland advocates can confuse the public by making unsubstantiated claims about natural predators eliminating or contro...
Mapping the spatio-temporal characteristics of wetland 19 inundation has important significance to the study of wetland environment and 20 associated flora and fauna. High temporal remote sensing imagery is widely 21 used for this purpose with the limitations of relatively low spatial resolutions. In 22 this study, a novel method based on integration of back-propagation neural 23 network (BP) a...
Rising temperature causes a process of phosphorus release, which can be characterized well using phosphorus release rates (VP). The objective of the present study was to investigate the major factors affecting sediment phosphorus release rates through a wetland habitat simulation experiment. The results showed that the VP of different wetland sediments were different and changed with the order ...
Methane (CH4 ) emissions from tropical wetlands contribute 60%-80% of global natural wetland CH4 emissions. Decreased wetland CH4 emissions can act as a negative feedback mechanism for future climate warming and vice versa. The impact of the El Niño-Southern Oscillation (ENSO) on CH4 emissions from wetlands remains poorly quantified at both regional and global scales, and El Niño events are exp...
Taking the Landsat TM and ASTER images of Hanshiqiao wetland nature reserve in 1988, 1996 and 2004 as data source, based on the images interpretation by supervised classification, the land use changes during the period 1988 to 2004 were analyzed through land use dynamic degree. And then the driving forces of land use changes were analyzed based on natural and artificial factors. The results ind...
Wetlands all over the world have been lost or are threatened in spite of various international agreements and national policies. This is caused by: (1) the public nature of many wetlands products and services; (2) user externalities imposed on other stakeholders; and (3) policy intervention failures that are due to a lack of consistency among government policies in different areas (economics, e...
Removal of heavy metals from wastewater by a constructed wetland system at Egerton University, Kenya
The use of constructed wetlands for wastewater treatment has been proposed as an intermediate technological solution for handling wastewater. The aim of the study was to assess the efficiency of a constructed wetland at Egerton University, Kenya for heavy metals removal from wastewater. The wetland has been used for tertiary treatment of effluent from waste stabilization ponds system since 2007...
Three wetland distribution maps were drawn using Two Land-sat 5 Thematic Mapper (TM) images from 1991 and 1999, and a China–Brazil Earth Resources Satellite (CBERS)02B image from 2006. A transition probability matrix was constructed using two wetland distribution maps, one from 1991 and one 1999 and GIS (Geographic Information System). The trends in changes in wetland types and the distribution...
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