نتایج جستجو برای: wetland

تعداد نتایج: 10233  

2010
K. Yoshino S. Kawaguchi F. Kanda K. Kushida F. Tsai

The ecosystem of wetlands has precious natural environment to be preserved in the world. In order to sustain valuable wetlands ecosystems for a long time, it is very important to frequently monitor the state of wetland ecosystems, to carefully watch the environment, and to earlier warn the environmental change. In this research, using high spatial resolution of color photographs taken with a 35...

Journal: :Environmental science & technology 2002
Eric E August Diane M McKnight Duane C Hrncir Kimberly S Garhart

An annual study of a natural wetland receiving drainage with high concentrations of iron, zinc, and manganese from an abandoned mine tunnel was conducted. During summer, the wetland reduced the mass flow from the tunnel to a receiving stream by more than 90% for iron, by 65% for zinc, and by 25% for manganese. Plant uptake accounted for less than 1% of the total retention. Zinc and manganese ma...

2002
Andrew Komor Peter Fox

Five sets of microcosm batch experiments were performed to evaluate mechanisms of nitrate removal in constructed wetlands. The study evaluated biological denitrification activity as a function of 1) electron donors carbon and sulfur 2) wetland sediment depth 3) oxygen and abiotic reactions and 4) carbon addition and attached populations from wetland bulrushes. Wetland-water-only controls amende...

2012
CORNELIS A. M. WAGEMAKER CRAIG D. H. SHERMAN MARCEL KLAASSEN JORDI FIGUEROLA

CASPER H. A. VAN LEEUWEN* , †, , NAOMI HUIG*, GERARD VAN DER VELDE †, § , THEO A. VAN ALEN , CORNELIS A. M. WAGEMAKER** , CRAIG D. H. SHERMAN , MARCEL KLAASSEN ††, ‡‡, § § AND JORDI FIGUEROLA Aquatic Ecology, Netherlands Institute of Ecology, Royal Netherlands Academy of Arts and Sciences (NIOO-KNAW), Wageningen, The Netherlands Radboud University Nijmegen, Institute for Water and Wetland Resea...

2017
José F. Rodríguez Patricia M. Saco Steven Sandi Neil Saintilan Gerardo Riccardi

The future of coastal wetlands and their ecological value depend on their capacity to adapt to the interacting effects of human impacts and sea-level rise. Even though extensive wetland loss due to submergence is a possible scenario, its magnitude is highly uncertain due to limited understanding of hydrodynamic and bio-geomorphic interactions over time. In particular, the effect of man-made dra...

Journal: :Environmental pollution 2009
M T Moore C M Cooper S Smith R F Cullum S S Knight M A Locke E R Bennett

Constructed wetlands are a suggested best management practice to help mitigate agricultural runoff before entering receiving aquatic ecosystems. A constructed wetland system (180 m x 30 m), comprising a sediment retention basin and two treatment cells, was used to determine the fate and transport of simulated runoff containing the pyrethroid insecticides lambda-cyhalothrin and cyfluthrin, as we...

Journal: :Water research 2012
Atreyee Sims John Horton Shashikanth Gajaraj Steve McIntosh Randall J Miles Ryan Mueller Robert Reed Zhiqiang Hu

Ammonia-oxidizing organisms play an important role in wetland water purification and nitrogen cycling. We determined soil nitrification rates and investigated the seasonal and spatial distributions of ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) in three freshwater wetlands by using specific primers targeting the amoA genes of AOA and AOB and real-time quantitative polym...

2015
Antonio Sanchez Dania Abdul Malak Anis Guelmami Christian Perennou

Wetlands are sensitive ecosystems that are increasingly subjected to threats from anthropogenic factors. In the last decades, coastal Mediterranean wetlands have been suffering considerable pressures from land use change, intensification of urban growth, increasing tourism infrastructure and intensification of agricultural practices. Remote sensing (RS) and Geographic Information Systems (GIS) ...

2016
Tingting Li Qing Zhang Wen Zhang Guocheng Wang Yanyu Lu Lijun Yu Ran Zhang

The Sanjiang Plain has been experienced significant wetland loss due to expanded agricultural activities, and will be potentially restored by the China National Wetland Conservation Action Plan (NWCP) in future. The objective of this study is to evaluate the impact of future climate warming and wetland restoration on wetland CH4 emissions in northeast China. We used an atmosphere-vegetation int...

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...

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