scholarly journals Towards analysis ready data of optical CubeSat images: Demonstrating a hierarchical normalization framework at a wetland site

2021 ◽  
Vol 103 ◽  
pp. 102502
Author(s):  
Zhan Li ◽  
Daniel Scheffler ◽  
Nicholas C. Coops ◽  
Nicholas Leach ◽  
Torsten Sachs
Keyword(s):  
Wetland Site

scholarly journals Response of Soil Moisture Change to Hydrological Processes in a Continuous Permafrost Environment

1990 ◽  
Vol 21 (4-5) ◽  
pp. 235-252 ◽  
Author(s):  
Ming-ko Woo ◽  
Philip Marsh
Keyword(s):  
Active Layer ◽  
Hydrological Processes ◽  
Moisture Loss ◽  
Moisture Regime ◽  
Permafrost Environment ◽  
Wetland Site ◽  
Gamma Density ◽  
Lateral Inflow ◽  
Continuous Permafrost ◽  
Moisture Storage

The moisture content of the active layer at three sites in a continuous permafrost area was measured using a twin-probe gamma density meter. The moisture storage status at these sites were related to various hydrological processes. Moisture was gained by meltwater and rainfall infiltration, but lost to evaporation in summer. Lateral inflow maintained a thick saturated zone at the fen (wetland) site. At the gravel site, there was a net moisture loss due to evaporation and lateral outflow. Moisture changes in the active layer during the summer were examined in terms of the water balance at the three sites. This established quantitative relationships between the moisture regime and the major hydrological processes in the permafrost environment.

scholarly journals DOC concentrations and spectroscopic characteristics in surface runoff from contrasting wetland ecosystems: a case study in the Sanjiang Plain, Northeast China

2012 ◽  
Vol 9 (6) ◽  
pp. 7919-7945
Author(s):  
L. L. Wang ◽  
C. C. Song ◽  
G. S. Yang
Keyword(s):  
Land Use ◽  
Surface Runoff ◽  
Rice Paddy ◽  
Sanjiang Plain ◽  
Natural Wetland ◽  
Artificial Wetland ◽  
The Sanjiang Plain ◽  
Wetland Ecosystems ◽  
Wetland Site ◽  
Spectroscopic Characteristics

Abstract. Dissolved organic carbon (DOC) is a significant component of carbon and nutrient cycling in fluvial ecosystems. Natural wetlands, as important DOC sources for river and ocean ecosystems, have experienced extensive natural and anthropogenic disturbances such as climate change, hydrological variations and land use change in recent years. In this study, we examined the concentrations and spectroscopic characteristics of DOC in surface runoff from contrasting wetlands along the lower Amur River Basin in the Sanjiang Plain, Northeastern China. Surface runoff from seven sites (two natural phialiform wetlands, three natural riparian wetland, one degraded wetland, and one artificial wetland i.e. rice paddy) were monitored during the growing seasons of 2009 and 2010. Surface runoff from the natural wetland sites exhibited a wide range of DOC concentrations (10.06–48.73 mg l−1) during the two-year sampling period. The specific ultraviolet absorbance (SUVA) and color values of DOC in surface runoff were also highly variable at different natural wetland sites. Our analysis also found that DOC values were significantly lower in the surface runoff at the artificial wetland site compared with those from surface runoff at the five natural wetland sites and one degraded wetland site (P < 0.01). The colour per carbon unit (C / C) ratio in surface runoff at the artificial wetland site was one to three times lower, while the E4 / E6 ratio (Abs465 / Abs665) was reduced by 42.07% to 55.36%, compared to those from runoff water at the five natural wetland sites. The C / C ratios in surface runoff at the natural wetland sites were higher than that from surface runoff at the degraded wetland, which in turn has greater values than that from surface runoff at the artificial wetland site. Meanwhile, the E4 / E6 ratio in the surface runoff from the artificial wetland was lower compared to that in surface runoff at the degraded wetland site (P < 0.05). This implies that disturbance to DOC concentrations and spectroscopic characteristics in surface runoff is stronger from natural wetland conversion to rice paddy land than that from wetland degradation. The dataset from this study can provide insightful points for understanding the underlying mechanisms of aquatic DOC dynamics from wetland ecosystems, and improve land use policy and management strategies in the future.

The pattern of human bone dissolution-A histological study of Iron Age warriors from a Danish wetland site

2018 ◽  
Vol 28 (4) ◽  
pp. 407-418 ◽  
Author(s):  
A.K.E. Tjelldén ◽  
S.M. Kristiansen ◽  
H. Birkedal ◽  
M.M.E. Jans
Keyword(s):  
Iron Age ◽  
Histological Study ◽  
Human Bone ◽  
Wetland Site

scholarly journals An Integrated Approach to Mitigation Wetland Site Selection: A Case Study in Gwacheon, Korea

2015 ◽  
Vol 7 (3) ◽  
pp. 3386-3413 ◽  
Author(s):  
Junga Lee ◽  
Christopher Ellis ◽  
Yun Choi ◽  
Soojin You ◽  
Jinhyung Chon
Keyword(s):  
Site Selection ◽  
Integrated Approach ◽  
Wetland Site ◽  
Mitigation Wetland

Seed dispersal, seedling emergence, and early survival of Larixlaricina (DuRoi) K. Koch in the Tanana Valley, Alaska

1988 ◽  
Vol 18 (3) ◽  
pp. 306-314 ◽  
Author(s):  
K.R. Brown ◽  
D.B. Zobel ◽  
J.C. Zasada
Keyword(s):  
Spatial Distribution ◽  
Seedling Emergence ◽  
Mineral Soil ◽  
Seasonal Patterns ◽  
Coniferous Species ◽  
Moisture Contents ◽  
Wetland Site ◽  
Early Survival ◽  
Dispersal Distances ◽  
Site Types

The seasonal and spatial patterns of seed release, germling emergence, and early survival of Larixlaricina (DuRoi) K. Koch were studied in 1980–1981 near Fairbanks, Alaska. Dispersal was studied on one wetland site. Seedling emergence and 1-year survival were studied on three wetland microsite types (troughs, feathermoss, and tussock tops, located at increasing elevations above permafrost) and in mineral soil and undisturbed feathermoss seedbeds in a mature Piceaglauca stand of alluvial origin. Approximately 95% of the viable Larix seed from the 1980 cone crop fell by November 1980. Spatial distribution of seed away from the stand was erratic because of variable winds and the presence of a single Larix away from the stand edge. Average dispersal distances were less than those reported for other coniferous species. Emergence and early survival in both site types were affected by seedbed type. In the alluvial stand, germination and 1-year survival were greater on mineral seedbeds than on feathermoss. Emergence began in mid-July, well after minimum temperatures required for germination had been reached; timing appeared to be related to differences in volumetric moisture contents of the two seedbed types. Although cumulative totals of emergence and mortality did not differ between microsite types in the wetland, seasonal patterns of each differed with microsite. Emergence in troughs was delayed until early July by cold seedbed temperatures; increased precipitation in mid to late July raised the water table and flooded newly emerged seedlings in trough microsites but moistened feathermoss sufficiently to promote germination. Variation in emergence and mortality was high within a given microsite type.

Emigration and Mortality of Black-necked Swans (Cygnus melancoryphus) and Disappearance of the Macrophyte Egeria densa in a Ramsar Wetland Site of Southern Chile

AMBIO ◽  
2007 ◽  
Vol 36 (7) ◽  
pp. 607-610 ◽  
Author(s):  
Eduardo Jaramillo Lopetegui ◽  
Roberto Schlatter Vollman ◽  
Heraldo Cifuentes Contreras ◽  
Cristian Duarte Valenzuela ◽  
Nelson Lagos Suarez ◽  
...  
Keyword(s):  
Egeria Densa ◽  
Southern Chile ◽  
Wetland Site ◽  
Ramsar Wetland

scholarly journals OCORRÊNCIA E DISTRIBUIÇÃO DE VERTEBRADOS AMEAÇADOS DE EXTINÇÃO NO PONTAL DA BARRA, PELOTAS, RIO GRANDE DO SUL, BRASIL / OCCURRENCE AND DISTRIBUTION OF THREATENED VERTEBRATE SPECIES AT PONTAL DA BARRA, PELOTAS, RIO GRANDE DO SUL, BRAZIL

2018 ◽  
Vol 3 (3) ◽  
pp. 301
Author(s):  
Giovanni Nachtigall Maurício ◽  
Omar Machado Entiauspe-Neto ◽  
Fernando Marques Quintela ◽  
Daniel Loebmann ◽  
Leonardo Amaral De Moraes
Keyword(s):  
Rio Grande ◽  
Iucn Red List ◽  
Vertebrate Species ◽  
Rio Grande Do Sul ◽  
Mammal Species ◽  
Patos Lagoon ◽  
Scenic Beauty ◽  
Wetland Site ◽  
Threatened Taxa ◽  
Environmental Integrity

O Pontal da Barra é uma área úmida localizada na praia do Laranjal, município de Pelotas, Rio Grande do Sul, no setor sul da laguna dos Patos. A área é rica em biodiversidade, abrigando várias espécies endêmicas dos biomas Mata Atlântica e Pampa, bem como espécies ameaçadas de extinção. Neste estudo reportamos dados detalhados sobre a ocorrência e distribuição, no Pontal da Barra, de oito espécies de vertebrados ameaçados: três peixes, Austrolebias nigrofasciatus Costa & Cheffe, Austrolebias wolterstorffi (Ahl) e Gymnotus refúgio Giora & Malabarba; uma espécie microendêmica e recém-descrita de réptil, Ophiodes enso Entiauspe-Neto et al.; três aves, Circus cinereus Vieillot, Calidris subruficollis (Vieillot) e Xolmis dominicanus (Vieillot); e uma espécie de mamífero, Leopardus geoffroyi (d’Orbigny & Gervais). Essas espécies são ameaçadas em nível nacional ou estadual. Entretanto, duas espécies microendêmicas restritas ao Pontal da Barra e arredores, Austrolebias nigrofasciatus e Ophiodes enso, também se enquadram como ameaçadas globalmente de acordo com os critérios da IUCN (União Internacional para a Conservação da Natureza), embora ainda não tenham sido avaliadas por essa organização. Destacamos que a área abriga as maiores populações conhecidas dessas espécies, o que qualifica o Pontal da Barra como uma prioridade global de conservação. Esse fato, juntamente com a beleza cênica e a integridade ambiental local, justifica a criação de uma unidade de conservação na área.Abstract:Pontal da Barra is a wetland site located at Laranjal beach town, municipality of Pelotas, Rio Grande do Sul state, in the southern end of Patos lagoon. The area is rich in biodiversity, harboring several species endemic to Atlantic Forest and Pampa biomes, as well as threatened taxa. In this paper we report detailed data on the occurrence and distribution of eight threatened vertebrate species at Pontal da Barra: three fishes, namely Austrolebias nigrofasciatus Costa & Cheffe, Austrolebias wolterstorffi (Ahl) and Gymnotus refugio Giora & Malabarba; a recently described microendemic species of reptile, Ophiodes enso Entiauspe-Neto et al.; three birds, namely Circus cinereus Vieillot, Calidris subruficollis (Vieillot) and Xolmis dominicanus (Vieillot); and a mammal species, namely Leopardus geoffroyi (d’Orbigny & Gervais). These species are threatened at national or state levels. However, two microendemic species restricted to Pontal da Barra and vicinity, namely Austrolebias nigrofasciatus and Ophiodes enso, also qualify as threatened at global level according to IUCN criteria, though both taxa have not been (yet) evaluated by IUCN Red List specialists. We highlight that the area harbor the largest known populations of these two species, thus qualifying as a global conservation priority. This fact, in conjunction with scenic beauty and environmental integrity, justify the creation of a conservation unit in the area.Key-words: Pontal da Barra, biodiversity; conservation; marshes; threatened species

Sign in / Sign up

Export Citation Format

Share Document