scholarly journals The wetland water level process and habitat of migratory birds in Lake Poyang

2011 ◽  
Vol 23 (1) ◽  
pp. 129-135 ◽  
Author(s):  
LIU Chenglin ◽  
◽  
TAN Yinjing ◽  
LIN Liansheng ◽  
TAO Hainan ◽  
...  
Keyword(s):  
Water Level ◽  
Migratory Birds ◽  
Wetland Water ◽  
Lake Poyang ◽  
Level Process

scholarly journals KONDISI LAHAN PASANG SURUT KAWASAN RAWA PENING DAN POTENSI PEMANFAATANNYA

2011 ◽  
Vol 9 (3) ◽  
Author(s):  
Euthalia Hanggari Sittadewi
Keyword(s):  
Water Level ◽  
Rice Field ◽  
Level Process ◽  
Paddy Yield ◽  
Dry And Rainy Seasons

The tidal land in Rawa Pening’s region is land that has been formed as caused of up and down water level process of Rawa Pening’s lake. The wide of tidal land that can be used are fluctuated beetwen dry and rainy seasons. The main used of tidal land is for rice field. The wide of tidal land that can be used for rice field beetwen elevation + 462,30 m and +463,30 m are 812 Ha, between elevation + 462,05 m and +462,30 are 218,51 Ha. There are some species of paddy that has been cultivated in that area, are IR-64, GH barito, ciliwung, cisadane, membramo and mentik. Mean of paddy yield is about 2,5 – 5 ton/ Ha.

A new method for fitting the complicated water level process of the lower Yellow River

2009 ◽  
Vol 52 (10) ◽  
pp. 2997-3003
Author(s):  
YongSheng Yuan ◽  
JiChun Wu ◽  
YiJun Zuo ◽  
JieRen Chen
Keyword(s):  
Water Level ◽  
Yellow River ◽  
New Method ◽  
Lower Yellow River ◽  
The Lower Yellow River ◽  
Level Process

scholarly journals Modelling the Impacts of Bathymetric Changes on Water Level in China’s Largest Freshwater Lake

Water ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1469 ◽  
Author(s):  
Lingyan Qi ◽  
Jiacong Huang ◽  
Junfeng Gao ◽  
Zhen Cui
Keyword(s):  
Water Level ◽  
Water Resource Management ◽  
Freshwater Lake ◽  
Lake Ecosystem ◽  
Spatial Gradient ◽  
Dramatic Decline ◽  
Hydrodynamic Processes ◽  
Lake Poyang ◽  
The Stability ◽  
Bathymetric Changes

A recent dramatic decline in water level during the dry season in China’s largest freshwater lake (Lake Poyang) significantly influenced water availability and biogeochemical processes. To learn the potential causes of water level decline, this study investigated the hydrodynamic response to bathymetric changes during three typical hydrological years by scenario simulation using Environmental Fluid Dynamics Code (EFDC). The simulation results indicated that bathymetric changes resulted in a water level decrease during a low water level period. Inter-annual variation in the decrease rate implied that water level in typical dry and wet years were influenced more significantly than that in moderate hydrological years. A spatial gradient in the distribution of water level changes was also observed, which was mainly concentrated in the main channel. Water velocities also slowed down, weakly corresponding to the decrease in water level during the low water level period. Overall, bathymetric changes caused by sand mining contributed to water level and velocity variations, influencing the stability and sustainability of the lake ecosystem. This study can potentially enhance our understanding of the hydrodynamic processes in Lake Poyang and support water resource management.

scholarly journals Integrated biomarker responses of the submerged macrophyte Vallisneria spiralis via hydrological processes from Lake Poyang, China

2018 ◽  
Vol 5 (12) ◽  
pp. 180729 ◽  
Author(s):  
Yong Ji ◽  
Zhidong Yao ◽  
Jie Zhang ◽  
Xueru Wang ◽  
Jixiang Luo ◽  
...  
Keyword(s):  
Enzyme Activity ◽  
Light Intensity ◽  
Water Level ◽  
Antioxidant Enzyme ◽  
Enzyme Activities ◽  
Antioxidant Enzyme Activity ◽  
Water Levels ◽  
Antioxidant Enzyme Activities ◽  
Wetland Plant ◽  
Lake Poyang

Vallisneria spiralis , a widely distributed wetland plant, was used to reveal how the light intensity at the top of the plant, plant morphology and antioxidant enzyme activity respond to different hydrologic conditions from Lake Poyang, China. By designing a laboratory experiment simulating historical water levels of low, normal and high wetland plant submersion, this study aimed to elucidate the effects of different levels of flooding on growth and antioxidant enzyme activity for V. spiralis . The results showed that the plant crown light intensity of the treated group and control group (CG) first decreased and then increased along with the seasonal variation of the water level. The maximum and minimum values of the plant crown light intensity were observed in April and July, respectively. Similar to the CG, V. spiralis from the normal and low water level (LWL) groups was measured and had higher plant height growth in the flooding period from May to June, and the entire plant biomass also showed a steady growth trend in the same period. However, the plant growth of the high water level (HWL) group was lower during the whole simulation period, with negative growth in July. Antioxidant enzyme activities changed with the seasonal temperature, and the activity of the CG showed a rising trend. Compared with those of the CG, the antioxidant enzyme activities of the HWL group showed a ‘bell shaped’ trend, which was first significantly induced and then significantly inhibited. In addition, the peroxidase (POD) and catalase (CAT) activities from the LWL group in April were also significantly induced. The integrated biomarker response (IBR) index showed that a comprehensive biological index could well reflect the effects of seasonal water levels in Poyang Lake on the growth of the wetland plant V. spiralis . This study indicated that high flooding levels had the strongest negative effect on the growth and enzyme activity of the submerged plant V. spiralis .

scholarly journals Landscape pattern changes of Carex and its response to water level in Lake Poyang Wetland

2017 ◽  
Vol 29 (4) ◽  
pp. 870-879
Author(s):  
ZHOU Yunkai ◽  
◽  
BAI Xiuling ◽  
NING Lixin
Keyword(s):  
Water Level ◽  
Landscape Pattern ◽  
Lake Poyang ◽  
Response To Water

scholarly journals New method and application of estimating ecological water level of the Lake Poyang

2015 ◽  
Vol 27 (5) ◽  
pp. 783-790 ◽  
Author(s):  
GAN Feng ◽  
◽  
TANG Lin ◽  
GUO Huaicheng ◽  
GAO Wei
Keyword(s):  
Water Level ◽  
New Method ◽  
Lake Poyang ◽  
Ecological Water Level

scholarly journals The Effects of Wetland Droughts on a Reserve in the African Continent

2021 ◽  
pp. 22-30
Author(s):  
Lawan Bulama ◽  
Ejeh Udeh Lawrence ◽  
Ahmad Abubakar Umar
Keyword(s):  
Migratory Birds ◽  
Management Strategies ◽  
Standardized Precipitation Index ◽  
Annual Rainfall ◽  
African Continent ◽  
Body Of Knowledge ◽  
High Magnitude ◽  
Wetland Water ◽  
Drying Up ◽  
Wintering Area

Climate change and its attendant fallouts such as drought, flood etc affect every aspects of environment including wetland ecosystem. This paper seeks to examine the effects of droughts on Dagona Waterfowl Sanctuary−an important wintering area for migratory birds in Bade local government, Yobe state, Nigeria. The study used annual rainfall data collected from the archives of the Nigerian Meteorological Agency (NIMET) with respect to Nguru weather station in the area for a period of 1956-2015. Standardized Precipitation Index (SPI) in conjunction with Percentage Deviation Below Mean (PDBM) models were applied for comprehensive drought detection on a time scale of twelve (12) months. SPI anomaly graphs were plotted to depict drought of varying magnitude. The researcher went round the sanctuary and made observations with the help of binocular and telescope. Findings explicitly revealed that the study area was replete with droughts of varying intensities ranging from mild, moderate, severe and extreme ones. And high magnitude droughts led to hydrological changes causing drying up of wetland water, decreased production of seeds that provide forage opportunities, intrusion of invasive species such as typha grasses forming dense biomass that hinder birds to prey on fishes or swim freely. The result of the analysis would add to the mainstream theoretical body of knowledge about droughts effects on wetlands. The research concludes that droughts of high magnitude occurred variably and affected both native and migratory birds in the study area and hence recommend the integration of disasters like drought in the management strategies of the wetlands.

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