scholarly journals Changes in Vegetation of Permanent Wetland; Goblej Wetland

2019 ◽  
pp. 191-201
Author(s):  
Dhaval K. Vaghela ◽  
Linz Buoy George
Keyword(s):  
Water Quality ◽  
Carbon Sequestration ◽  
Groundwater Recharge ◽  
Significant Role ◽  
Seasonal Changes ◽  
Hydrological Cycle ◽  
Permanent Wetland

Wetlands are most productive ecosystem. They provide habitat for flora and fauna. Wetlands play important role in hydrological cycle, nutrition cycle, Carbon sequestration, water quality and groundwater recharge. Vegetation plays very significant role in maintenance of ecosystem. Present study reports seasonal changes in permanent wetland. This will be helpful for restoration of such wetland.

Pollution retention capabilities of roadside soils

1999 ◽  
Vol 39 (2) ◽  
pp. 201-208 ◽  
Author(s):  
C. Dierkes ◽  
W. F. Geiger
Keyword(s):  
Heavy Metals ◽  
Water Quality ◽  
Drinking Water ◽  
Groundwater Recharge ◽  
Drinking Water Quality ◽  
Traffic Density ◽  
Roadside Soils ◽  
Highway Runoff ◽  
Lead And Cadmium ◽  
Lead Zinc

Runoff from highways contains significant loads of heavy metals and hydrocarbons. According to German regulations, it should be infiltrated over embankments to support groundwater-recharge. To investigate the decontaminating effect of greened embankments, soil-monoliths from highways with high traffic densities were taken. Soils were analyzed to characterize the contamination in relation to distance and depth for lead, zinc, copper, cadmium, PAH and MOTH. Lysimeters were charged in the field and laboratory with highway runoff to study the effluents under defined conditions. Concentrations of pollutants in roadside soils depend on the age of embankments and traffic density. Highest concentrations were found in the upper 5 cm of the soil and within a distance of up to two metres from the street. Concentrations of most pollutants decreased rapidly with depth and distance. Lead and cadmium could not be detected in lysimeter effluent. Zinc and copper were found in concentrations that did not exceed drinking water quality limits.

scholarly journals Seasonal changes in water quality and macrophytes and the impact of cattle on tropical floodplain waterholes

2012 ◽  
Vol 63 (9) ◽  
pp. 788 ◽  
Author(s):  
N. E. Pettit ◽  
T. D. Jardine ◽  
S. K. Hamilton ◽  
V. Sinnamon ◽  
D. Valdez ◽  
...  
Keyword(s):  
Water Quality ◽  
Seasonal Changes ◽  
Aquatic Macrophyte ◽  
Plant Cover ◽  
Critical Role ◽  
Dry Season ◽  
Nutrient Concentrations ◽  
Wet Season ◽  
Dry Tropics ◽  
The Impact

The present study indicates the critical role of hydrologic connectivity in floodplain waterholes in the wet–dry tropics of northern Australia. These waterbodies provide dry-season refugia for plants and animals, are a hotspot of productivity, and are a critical part in the subsistence economy of many remote Aboriginal communities. We examined seasonal changes in water quality and aquatic plant cover of floodplain waterholes, and related changes to variation of waterhole depth and visitation by livestock. The waterholes showed declining water quality through the dry season, which was exacerbated by more frequent cattle usage as conditions became progressively drier, which also increased turbidity and nutrient concentrations. Aquatic macrophyte biomass was highest in the early dry season, and declined as the dry season progressed. Remaining macrophytes were flushed out by the first wet-season flows, although they quickly re-establish later during the wet season. Waterholes of greater depth were more resistant to the effects of cattle disturbance, and seasonal flushing of the waterholes with wet-season flooding homogenised the water quality and increased plant cover of previously disparate waterholes. Therefore, maintaining high levels of connectivity between the river and its floodplain is vital for the persistence of these waterholes.

scholarly journals Impacts of extreme precipitation and seasonal changes in precipitation on plants

2014 ◽  
Vol 11 (11) ◽  
pp. 3083-3093 ◽  
Author(s):  
M. J. B. Zeppel ◽  
J. V. Wilks ◽  
J. D. Lewis
Keyword(s):  
Extreme Precipitation ◽  
Seasonal Changes ◽  
Net Primary Productivity ◽  
Hydrological Cycle ◽  
Aridity Index ◽  
Summer Precipitation ◽  
Negative Effects ◽  
Available Water ◽  
Key Factor ◽  
Plant Available Water

Abstract. The global hydrological cycle is predicted to become more intense in future climates, with both larger precipitation events and longer times between events in some regions. Redistribution of precipitation may occur both within and across seasons, and the resulting wide fluctuations in soil water content (SWC) may dramatically affect plants. Though these responses remain poorly understood, recent research in this emerging field suggests the effects of redistributed precipitation may differ from predictions based on previous drought studies. We review available studies on both extreme precipitation (redistribution within seasons) and seasonal changes in precipitation (redistribution across seasons) on grasslands and forests. Extreme precipitation differentially affected above-ground net primary productivity (ANPP), depending on whether extreme precipitation led to increased or decreased SWC, which differed based on the current precipitation and aridity index of the site. Specifically, studies to date reported that extreme precipitation decreased ANPP in mesic sites, but, conversely, increased ANPP in xeric sites, suggesting that plant-available water is a key factor driving responses to extreme precipitation. Similarly, the effects of seasonal changes in precipitation on ANPP, phenology, and leaf and fruit development varied with the effect on SWC. Reductions in spring or summer generally had negative effects on plants, associated with reduced SWC, while subsequent reductions in autumn or winter had little effect on SWC or plants. Similarly, increased summer precipitation had a more dramatic impact on plants than winter increases in precipitation. The patterns of response suggest xeric biomes may respond positively to extreme precipitation, while comparatively mesic biomes may be more likely to be negatively affected. Moreover, seasonal changes in precipitation during warm or dry seasons may have larger effects than changes during cool or wet seasons. Accordingly, responses to redistributed precipitation will involve a complex interplay between plant-available water, plant functional type and resultant influences on plant phenology, growth and water relations. These results highlight the need for experiments across a range of soil types and plant functional types, critical for predicting future vegetation responses to future climates.

Seasonal changes in water quality and its main influencing factors in the Dan River basin

CATENA ◽  
2019 ◽  
Vol 173 ◽  
pp. 131-140 ◽  
Author(s):  
Guoce Xu ◽  
Peng Li ◽  
Kexin Lu ◽  
Zhan Tantai ◽  
Jiaxin Zhang ◽  
...  
Keyword(s):  
Water Quality ◽  
Influencing Factors ◽  
River Basin ◽  
Seasonal Changes

scholarly journals Substrate Specific Zooperiphyton And Their Relationships With Water Quality Parameters In Dhanmondi Lake Dhaka, Bangladesh

2014 ◽  
Vol 40 (2) ◽  
pp. 283-294
Author(s):  
Md Eilious Hosain ◽  
M Niamul Naser
Keyword(s):  
Water Quality ◽  
Significant Role ◽  
Quality Parameters ◽  
Aquatic System ◽  
Water Quality Parameters ◽  
Aquatic Biota ◽  
Dominant Group ◽  
Aesthetic Value ◽  
Physicochemical Features

In the present investigation, zooperiphyton communities comprised protozoa, rotifera copepoda, cladocera, ostracoda, conchostraca, insect’s larvae, oligochaeta, nematoda and mollusca. The group of zooperiphyton on three substrates showed no significant differences (P>0.05). Rotifers and protozoans were the most dominant group of total zooperiphyton abundance among three substrates. The interrelationships between zooperiphyton groups and physicochemical features of water as well as among different groups of zooperiphyton revealed that abundance and growth of zooperiphyton on substrates are influenced by water quality parameters and each with others. The ranges of physicochemical features of water of Dhanmondi lake were suitable for zooperiphyton communities including aquatic biota and also play a significant role to settle zooperiphyton on three substrates. That can help in enhancing productivity of the lake as well as sustaining aesthetic value of aquatic system. Asiat. Soc. Bangladesh, Sci. 40(2): 283-294, December 2014

scholarly journals Climate change impacts on hydrology and water resources of Indian River basin

2018 ◽  
Vol 13 (1) ◽  
pp. 32-43 ◽  
Author(s):  
Umesh Kumar Singh ◽  
Balwant Kumar
Keyword(s):  
Climate Change ◽  
Groundwater Recharge ◽  
River Basin ◽  
Greenhouse Gas Emission ◽  
Hydrological Cycle ◽  
Indian Subcontinent ◽  
Climatic Variability ◽  
River Basins ◽  
Extreme Weather Events ◽  
Runoff Generation

Anthropogenic greenhouse gas emission is altering the global hydrological cycle due to change in rainfall pattern and rising temperature which is responsible for alteration in the physical characteristics of river basin, melting of ice, drought, flood, extreme weather events and alteration in groundwater recharge. In India, water demand for domestic, industrial and agriculture purposes have already increased many folds which are also influencing the water resource system. In addition, climate change has induced the surface temperature of the Indian subcontinent by 0.48 ºC in just last century. However, Ganges–Brahmaputra–Meghna (GBM) river basins have great importance for their exceptional hydro-geological settings and deltaic floodplain wetland ecosystems which support 700 million people in Asia. The climatic variability like alterations in precipitation and temperature over GBM river basins has been observed which signifies the GBM as one of the most vulnerable areas in the world under the potential impact of climate change. Consequently, alteration in river discharge, higher runoff generation, low groundwater recharge and melting of glaciers over GBM river basin could be observed in near future. The consequence of these changes due to climate change over GBM basin may create serious water problem for Indian sub-continents. This paper reviews the literature on the historical climate variations and how climate change affects the hydrological characteristics of different river basins.

scholarly journals Water balance computation and water quality improvement evaluation for Yanghe Basin in semiarid area of North China using coupled MIKE SHE/MIKE 11 modeling

2021 ◽  
Author(s):  
Ruifen Liu ◽  
Zeshi Li ◽  
Xiaokang Xin ◽  
Defu Liu ◽  
Jialei Zhang ◽  
...  
Keyword(s):  
Water Quality ◽  
Quality Improvement ◽  
Pollution Control ◽  
North China ◽  
Hydrological Cycle ◽  
Control Measures ◽  
Semiarid Area ◽  
Mike She ◽  
Water Quality Improvement ◽  
Mike 11

Abstract Water shortage and water pollution are two prominent issues in North China. Understanding hydrological cycle and water-quality changes in response to pollution control measures is fundamental for a better water management there. Using coupled MIKE SHE/MIKE 11 modeling, various hydrological components in Yanghe Basin in semiarid area of North China were quantified for three typical hydrological years and concentrations of COD and TP in a national monitoring section of Yanghe were evaluated with/without pollution control measures. The modeling results show that the underground water storage of Yanghe Basin gets depleted due to evapotranspiration compensation and groundwater utilization regardless of hydrological condition, indicating an unsustainable in-situ water resource utilization. Water quality goals set for Yanghe (COD ≤ 20 mg/L and TP ≤ 0.2 mg/L) can hardly be achieved if pollution control measures are not taken, especially for a dry hydrological year. Depending on hydrological conditions, non-point source control technology-related projects in a 109-km2 village and a 7-km river-channel wetland in mainstream of Yanghe will have a positive effect or negligible effect on water quality improvement. To meet water quality goals, implementation of three wetlands is an effective and economic way.

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