نتایج جستجو برای: playa wetland

تعداد نتایج: 11151  

2017
Meng Guo Jing Li Chunlei Sheng Jiawei Xu Li Wu

Wetlands are some of the most important ecosystems on Earth. They play a key role in alleviating floods and filtering polluted water and also provide habitats for many plants and animals. Wetlands also interact with climate change. Over the past 50 years, wetlands have been polluted and declined dramatically as land cover has changed in some regions. Remote sensing has been the most useful tool...

Journal: :Remote Sensing 2017
Haoming Xia Wei Zhao Ainong Li Jinhu Bian Zhengjian Zhang

Wetland inundation is crucial to the survival and prosperity of fauna and flora communities in wetland ecosystems. Even small changes in surface inundation may result in a substantial impact on the wetland ecosystem characteristics and function. This study presented a novel method for wetland inundation mapping at a subpixel scale in a typical wetland region on the Zoige Plateau, northeast Tibe...

2004
Joy B. Zedler Suzanne Kercher

Wetlands seem to be especially vulnerable to invasions. Even though ≤6% of the earth’s land mass is wetland, 24% (8 of 33) of the world’s most invasive plants are wetland species. Furthermore, many wetland invaders form monotypes, which alter habitat structure, lower biodiversity (both number and “quality” of species), change nutrient cycling and productivity (often increasing it), and modify f...

2014
Magdalena K. Stoeva Stéphane Aris-Brosou John Chételat Holger Hintelmann Philip Pelletier Alexandre J. Poulain

While microbial communities play a key role in the geochemical cycling of nutrients and contaminants in anaerobic freshwater sediments, their structure and activity in polar desert ecosystems are still poorly understood, both across heterogeneous freshwater environments such as lakes and wetlands, and across sediment depths. To address this question, we performed targeted environmental transcri...

This study aims to enlist Rotatoria in the Anzali wetland (southwest Caspian Sea), a wetland which is listed as an international wetland in Ramsar convention (1975) and is an important ecosystem for spawning and early rearing of larvae of anadromous fishes. Samples of rotifers were collected in three regions of the Anzali wetland between  June 2015 and May 2016. A total of 29 genera of rotifers...

A Salmanmahiny H. Mirkarimi N.A. Hasan Abassi S Sefidian,

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...

Journal: :محیط شناسی 0
لعبت زبردست دانشجوی دکتری رشته برنامه ریزی محیط زیست دانشکدة محیط زیست دانشگاه تهران حمید رضا جعفری دانشیار گروه برنامه ریزی محیط زیست دانشکدة محیط زیست دانشگاه تهران

there are two approaches regarding environmental changes. one of the is ignoring them and continuing present trend in future, and the other is identifying these changes and preparing environmental management program in order to control their negative impacts and plan for the improvement of environmental condition. anzali international wetland is one of the protected wetlands in iran which is in...

Journal: :Journal of environmental quality 2012
Michael A Mallin Janie A McAuliffe Matthew R McIver David Mayes Michael A Hanson

Hewletts Creek, in Wilmington, North Carolina, drains a large suburban watershed and as such is affected by high fecal bacteria loads and periodic algal blooms from nutrient loading. During 2007, a 3.1-ha wetland was constructed to treat stormwater runoff from a 238-ha watershed within the Hewletts Creek drainage. A rain event sampling program was performed in 2009-2010 to evaluate the efficacy...

Journal: :Journal of environmental sciences 2010
Juanli Yun Anzhou Ma Yaoming Li Guoqiang Zhuang Yanfen Wang Hongxun Zhang

Zoige wetland is one of the most important methane emission centers in China. The oxidation of methane in the wetland affects global warming, soil ecology and atmospheric chemistry. Despite their global significance, microorganisms that consume methane in Zoige wetland remain poorly characterized. In this study, we investigated methanotrophs diversity in soil samples from both anaerobic site an...

2015
Naveen Adusumilli Audrey L. Mayer

Section 404 of the U.S. Clean Water Act includes most wetlands in its jurisdiction and requires wetland mitigation to compensate for permitted wetland losses. These mitigation wetlands can provide ecosystem services similar to original wetlands if properly constructed. Improvement of wetland monitoring requirements coupled with economic assessment is critical for effective implementation of the...

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