نتایج جستجو برای: ranjit sagar wetland

تعداد نتایج: 10631  

2016
Hui Zhao Xiaodan Wang Yanjiang Cai Weilong Liu

Understanding wetland changes under urbanization is important for wetland management. In this study, net transition intensity (NTI) and total transition intensity (TTI) are presented to characterize wetland transitions based on spatial data obtained from Landsat satellite images of Pearl River estuary in South China. NTI is commonly used to represent changes in absolute amounts for each class o...

Journal: :محیط شناسی 0
علیرضا میرزاجانی مربی پژوهشی پ‍‍‍‍‍‍‍‍‍‍ژوهشکدة آبزی پروری آبهای داخلی ایران - بندر انزلی حجت خداپرست مربی پژوهشی پ‍‍‍‍‍‍‍‍‍‍ژوهشکدة آبزی پروری آبهای داخلی ایران - بندر انزلی هادی بابایی کارشناس ارشد پ‍‍‍‍‍‍‍‍‍‍ژوهشکدة آبزی پروری آبهای داخلی ایران - بندر انزلی علی عابدینی مربی پژوهشی پ‍‍‍‍‍‍‍‍‍‍ژوهشکدة آبزی پروری آبهای داخلی ایران - بندر انزلی عظمت دادی قندی کارشناس ارشد پ‍‍‍‍‍‍‍‍‍‍ژوهشکدة آبزی پروری آبهای داخلی ایران - بندر انزلی

anzali wetland on the south west of caspian sea is a unique ecosystem was registered as ramsar site at 1975. anzali wetland was deteriorated due to numerous disorder and poor water quality. the riverin input were strongly affective in the process of eutrophication where the eastern and central region was more degraded. the first survey on the eutrophication process was conducted at 1969, since ...

Journal: :تحقیقات نظام سلامت 0
عباس اکبرزاده دکترای تخصصی، مؤسسه تحقیقات آب وزارت نیرو، تهران، ایران. محسن اربابی استادیار، گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی شهرکرد، شهرکرد، ایران.

background: in the recent years, eutrophication has become a serious challenge for many of the water ecosystems. it has affected the environmental and economical aspects of the anzali wetland, which is known as one of the significant ecosystem. due to the increase of the nutrient loadings from the industrial, agricultural and human activities, the wetland’s health is faced many serious problems...

2014
William J. Mitsch Li Zhang Evan Waletzko Blanca Bernal

Wetlands provide many ecosystem services to society, most notably the provision of habitat for important plants and animals, the improvement of water quality, and the sequestration of carbon. Nitrogen and phosphorus budgets, vegetation structure and function, and carbon fluxes and accumulation are described for a pair of 1-ha created riverine wetlands in central Ohio USA over 20 years (1994–201...

Journal: :محیط شناسی 0
صادق خلیلیان دانشگاه تربیت مدرس ، دانشیار اقتصاد کشاورزی، دانشکدة کشاورزی محمد خداوردیزاده دانشگاه تربیت مدرس، دانشجوی دکترای اقتصاد کشاورزی دانشکدة کشاورزی محمد کاوسی کلاشمی دانشگاه تهران ، دانشجوی دکترای اقتصاد کشاورزی، دانشکدة اقتصاد و توسعة کشاورزی

although individuals knowledge and awareness toward natural resources, especially wetlands had been increased but still social consideration level toward wetland importance, functions and sensitivity are low. considerable amount of wetlands destruction caused by miscalculation of wetlands functions’ values in a market condition. estimating the value of wetland’s function is a way in order to un...

2015
Peggy W Lehman Shawn Mayr Leji Liu Alison Tang

The loss of inorganic and organic material export and habitat produced by freshwater tidal wetlands is hypothesized to be an important contributing factor to the long-term decline in fishery production in San Francisco Estuary. However, due to the absence of freshwater tidal wetlands in the estuary, there is little information on the export of inorganic and organic carbon, nutrient or phytoplan...

Journal: :محیط شناسی 0
فریدون غضبان دانشیار، گروه مهندسی محیط زیست، دانشکدة محیط زیست دانشگاه تهران مریم زارع خوش اقبال استادیار، رسوب شناسی و سنگ شناسی رسوبی، دانشگاه آزاد آستارا

abstruct anzali wetland in north of guilan provience is an international important wetland that is recorded in ramsar convension. pollution is one of the major problems facing this wetland. in order to investigate the pollution situation, sediment core samples were taken in 7 stations in 4 districts within the wetland, namely abkenar, siakishom, hendekhale and shijan). elements were determined ...

Journal: :environmental resources research 0
s sefidian gorgan university of agricultural sciences and natural resources (guasnr), gorgan, iran a salmanmahiny gorgan university of agricultural sciences and natural resources (guasnr), gorgan, iran h. mirkarimi gorgan university of agricultural sciences and natural resources (guasnr), gorgan, iran n.a. hasan abassi gorgan university of agricultural sciences and natural resources (guasnr), gorgan, iran

wetlands as water resources have a special place in the semi-arid plateau of iran and boundary determination is necessary for their effective conservation and conflict resolution among stakeholders that are dependent on these resources. determination of the wetland boundaries should be commensurate with environmental features affecting on it which normally extend beyond water extent. ecological...

2015
Se-Yeun Lee Maureen E. Ryan Alan F. Hamlet Wendy J. Palen Joshua J. Lawler Meghan Halabisky Curtis J. Richardson

Wetlands are globally important ecosystems that provide critical services for natural communities and human society. Montane wetland ecosystems are expected to be among the most sensitive to changing climate, as their persistence depends on factors directly influenced by climate (e.g. precipitation, snowpack, evaporation). Despite their importance and climate sensitivity, wetlands tend to be un...

Measuring salinity of water at different depths along six transacts at the mouth of the wetland and along five tributaries connecting the wetland to the sea the extent of Caspian Sea penetration into Anzali Wetland was determined. The results demonstrated a depth-dependent salinity gradient extending up to 10 kilometres into the wetland. A pattern of saltwater and freshwater interface is presen...

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