scholarly journals Littoral Slope, Water Depth and Alternative Response Strategies to Light Attenuation Shape the Distribution of Submerged Macrophytes in a Mesotrophic Lake

2019 ◽  
Vol 10 ◽  
Author(s):  
Liang He ◽  
Tianshun Zhu ◽  
Yao Wu ◽  
Wei Li ◽  
Huan Zhang ◽  
...  
Keyword(s):  
Water Depth ◽  
Submerged Macrophytes ◽  
Light Attenuation ◽  
Alternative Response ◽  
Response Strategies ◽  
Mesotrophic Lake

scholarly journals Effects of Water Depth on the Growth of the Submerged Macrophytes Vallisneria natans and Hydrilla verticillata: Implications for Water Level Management

Water ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 2590
Author(s):  
Qisheng Li ◽  
Yanqing Han ◽  
Kunquan Chen ◽  
Xiaolong Huang ◽  
Kuanyi Li ◽  
...  
Keyword(s):  
Water Level ◽  
Water Depth ◽  
Deep Water ◽  
Submerged Macrophytes ◽  
Hydrilla Verticillata ◽  
Water Level Fluctuations ◽  
Total Biomass ◽  
Intermediate Water ◽  
Factors Affecting ◽  
Vallisneria Natans

Water level is one of the most important factors affecting the growth of submerged macrophytes in aquatic ecosystems. The rosette plant Vallisneria natans and the erect plant Hydrilla verticillata are two common submerged macrophytes in lakes of the middle and lower reaches of the Yangtze River, China. How water level fluctuations affect their growth and competition is still unknown. In this study, three water depths (50 cm, 150 cm, and 250 cm) were established to explore the responses in growth and competitive patterns of the two plant species to water depth under mixed planting conditions. The results show that, compared with shallow water conditions (50 cm), the growth of both submerged macrophytes was severely suppressed in deep water depth (250 cm), while only V. natans was inhibited under intermediate water depth (150 cm). Moreover, the ratio of biomass of V. natans to H. verticillata gradually increased with increasing water depth, indicating that deep water enhanced the competitive advantage of V. natans over H.verticillata. Morphological adaptation of the two submerged macrophytes to water depth was different. With increasing water depth, H. verticillata increased its height, at the cost of reduced plant numbers to adapt to poor light conditions. A similar strategy was also observed in V. natans, when water depth increased from 50 cm to 150 cm. However, both the plant height and number were reduced at deep water depth (250 cm). Our study suggests that water level reduction in lake restoration efforts could increase the total biomass of submerged macrophytes, but the domination of key plants, such as V. natans, may decrease.

NONFLOATING OIL SPILL RESPONSE PLANNING

2001 ◽  
Vol 2001 (2) ◽  
pp. 1307-1311 ◽  
Author(s):  
Paul R. Schnitz ◽  
Martha A. Wolf
Keyword(s):  
Heavy Oil ◽  
Oil Spills ◽  
Health And Safety ◽  
Heavy Oils ◽  
Alternative Response ◽  
Effective Response ◽  
Response Strategies ◽  
Advantages And Disadvantages ◽  
Response Planning ◽  
Location Mapping

ABSTRACT Like conventional, lighter-than-water oils, heavy oils that sink or become suspended in water when spilled can cause damage to the environment, threaten human health, and adversely affect economic resources. The behavior of heavy oil in water complicates aspects of spill response including location, mapping and containment of spilled oil; assessment of environmental and economic impacts; responder health and safety; prediction of oil movement; comparison of alternative response methods; and measurement and documentation of cleanup effectiveness. Experience shows that the techniques and equipment needed to respond to heavy oil spills are highly specific to the spill location and circumstances of the spill, accentuating the importance of preincident planning. Sound planning is one of the most important tools available for implementing an effective response to oil spills and minimizing their impacts. In this paper response strategies that have been utilized in nonfloating oil spills are examined, and the relative advantages and disadvantages of techniques and equipment employed in those incidents are discussed. The intent of this examination is to help emergency response planners recognize response methods that have worked under conditions they are likely to encounter so they can plan accordingly.

scholarly journals Effects of water depth on growth of submerged macrophytes Vallisneria natans and Myriophyllum spicatum

2019 ◽  
Vol 31 (4) ◽  
pp. 1045-1054
Author(s):  
LI Qisheng ◽  
◽  
HUANG Qiang ◽  
LI Yongji ◽  
HAN Yanqing ◽  
...  
Keyword(s):  
Water Depth ◽  
Submerged Macrophytes ◽  
Myriophyllum Spicatum ◽  
Vallisneria Natans

scholarly journals Effects of Water Level Fluctuations on the Growth Characteristics and Community Succession of Submerged Macrophytes: A Case Study of Yilong Lake, China

Water ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 2900
Author(s):  
Fengbin Zhao ◽  
Xin Fang ◽  
Zeyu Zhao ◽  
Xiaoli Chai
Keyword(s):  
Community Structure ◽  
Water Level ◽  
Water Depth ◽  
Seed Bank ◽  
Submerged Macrophytes ◽  
Growth Characteristics ◽  
Community Succession ◽  
Submerged Plant ◽  
Submerged Plants ◽  
Emergent Plants

Water level fluctuation (WLF) has a significant effect on aquatic macrophytes, but few experimental studies have examined the effect of WLF on submerged community succession, especially from a large-scale perspective. In this study, field monitoring of WLF and submerged macrophytes was conducted in Yilong Lake (SE China) over two years, and the impacts of WLF on the growth characteristics and the community structure of submerged macrophytes were determined. The results show that the biomass of submerged macrophytes decreased significantly after the water level increased and submerged macrophytes could cope with the adverse environment by adjusting their growth posture, for example, increasing plant length and reducing branch number. However, different submerged plants have different regulatory abilities, which leads to a change in the community structure. Myriophyllum spicatum, Stuckenia pectinata, and Najas marina had better adaptation abilities to WLF than Najas minor and Utricularia vulgaris. Changes in water depth, dissolved oxygen, and transparency significantly contribute to the effect of WLF on submerged plant communities. Therefore, when determining the range of WLF, the above three critical factors and submerged plant species should be considered. WLF changed the spatial distribution of the aquatic plant community. When water levels rose, the density of the submerged macrophyte community in the original growth region reduced as the emergent plants migrated to shallower water, and the seed bank germination was aided by transparent water produced among emergent plants. This can be used as a pioneering measure to restore submerged plants in eutrophic lakes with low transparency. In addition, a suitable water depth created by WLF was conducive to activating the seed bank and improving the diversity of aquatic plants. Finally, a distribution map of aquatic plants in Yilong Lake is drawn.

MODELING THE WATER-ACCOMMODATED FRACTION IN OSCAR2000

2001 ◽  
Vol 2001 (2) ◽  
pp. 1083-1091 ◽  
Author(s):  
Mark Reed ◽  
Ivar Singsaas ◽  
Per S. Daling ◽  
Liv-Guri Faksnes ◽  
Odd Gunnar Brakstad ◽  
...  
Keyword(s):  
Oil Spill ◽  
Laboratory Data ◽  
Degradation Process ◽  
Response Model ◽  
Potential Importance ◽  
Alternative Response ◽  
3 Dimensional ◽  
Response Strategies ◽  
Or Groups ◽  
Oil Components

ABSTRACT Oil Spill Contingency and Response 2000 (OSCAR2000) is a multicomponent 3-dimensional oil spill contingency and response model tool for analysis of alternative response strategies. The model allows specification of oil using an arbitrary number of separate components or pseudocomponents. This specification is retained throughout the model domain, such that detailed information on the behavior, fate, and effects of complex mixtures can be incorporated accurately into the model. This detailed representation allows the model to make full use of laboratory data that typically are derived for individual oil components or groups of components. Examples of such data include toxicity, degradation, dissolution, and evaporation rates. An example application demonstrates the potential importance of the degradation process in determining the eventual fate and effects of a deepwater release of oil.

Adaptation of submerged macrophytes to both water depth and flood intensity as revealed by their mechanical resistance

Hydrobiologia ◽  
2012 ◽  
Vol 696 (1) ◽  
pp. 77-93 ◽  
Author(s):  
Guorong Zhu ◽  
Wei Li ◽  
Meng Zhang ◽  
Leyi Ni ◽  
Shengrui Wang
Keyword(s):  
Water Depth ◽  
Submerged Macrophytes ◽  
Mechanical Resistance ◽  
Flood Intensity
Sign in / Sign up

Export Citation Format

Share Document