Impact of Water-Sediment Regulation Scheme on seasonal and spatial variations of biogeochemical factors in the Yellow River estuary

2017 ◽  
Vol 198 ◽  
pp. 92-105 ◽  
Author(s):  
Yujue Wang ◽  
Dongyan Liu ◽  
Kenneth Lee ◽  
Zhijun Dong ◽  
Baoping Di ◽  
...  
Keyword(s):  
Yellow River ◽  
River Estuary ◽  
Spatial Variations ◽  
Yellow River Estuary ◽  
The Yellow River ◽  
Regulation Scheme ◽  
Seasonal And Spatial Variations ◽  
Biogeochemical Factors

Effects of the Water-Sediment Regulation Scheme (WSRS) on the expansion of Spartina alterniflora at the Yellow River Estuary, China

2021 ◽  
Author(s):  
Dongdong Shao
Keyword(s):  
Spartina Alterniflora ◽  
Landscape Metrics ◽  
Yellow River ◽  
River Estuary ◽  
Yellow River Estuary ◽  
The Yellow River ◽  
Mean Flow ◽  
Estuarine Ecosystem ◽  
Regulation Scheme ◽  
Significant Difference

<p>In recent decades, the invasion of saltmarsh plant Spartina alterniflora (S. alterniflora) over a large part of coastal wetlands in China, including the Yellow River Estuary (YRE) as a regional economic hub and global ecosystem services hotspot, has caused increasing concern because of its serious threats to native ecosystems. During the same period, local authorities have implemented a Water-Sediment Regulation Scheme (WSRS) in the Yellow River for flood mitigation and delta restoration purposes. The altered hydrological regime has resulted in unintended changes to estuarine ecosystem. However, the direct consequence of the WSRS on the expansion of S. alterniflora remains unclear. In this study, quantitative relationship between the inter- and intra-annual expansion patterns of S. alterniflora represented by relevant landscape metrics and indicators that quantify the concurrent variations of river and sediment discharges as the proxy of the WSRS impacts were analysed over the period of Year 2011 to 2018, and the analyses were performed on the YRE as a whole and on five different zones subdivided based on the invasion sequence. The results showed that there was no significant difference in the inter-annual area variation of S. alterniflora between the years with and without WSRS. Compared with the years without WSRS (2016-2017), the intra-annual (monthly) increment of the various landscape metrics (i.e. NP (number of patches), CA (class area), LPI (largest patch index) and AI (aggregation index)) were found to be significantly higher in the initial stage of peak growing season (June-July) than in the mid- and late stages (July-September) in the years with WSRS (2011-2015, 2018) in the subregion located close to the south bank of YRE as the most prominent impact zone. In addition, F (mean flow), Ff (number of high flow pulses), Tf (Julian date of maximum flow) and D (duration of WSRS) were identified as the explanatory variables for the intra-annual vegetation landscape pattern changes, and their relative contributions to resultant changes were also assessed. Our results broaden the understanding of estuarine hydrological disturbance as a potential driver regulating the saltmarsh vegetation, and also have implications for S. alterniflora invasion control at estuaries under changing environment.</p>

Impact of the Water–Sediment Regulation Scheme on the phytoplankton community in the Yellow River estuary

2021 ◽  
Vol 294 ◽  
pp. 126291
Author(s):  
Jingjing Zhang ◽  
Fan Li ◽  
Qiming Lv ◽  
Yibin Wang ◽  
Junbao Yu ◽  
...  
Keyword(s):  
Phytoplankton Community ◽  
Yellow River ◽  
River Estuary ◽  
Yellow River Estuary ◽  
The Yellow River ◽  
Regulation Scheme

scholarly journals Spatial variations and bioaccumulation of heavy metals in intertidal zone of the Yellow River estuary, China

CATENA ◽  
2015 ◽  
Vol 126 ◽  
pp. 43-52 ◽  
Author(s):  
Zhigao Sun ◽  
Xiaojie Mou ◽  
Chuan Tong ◽  
Chuanyuan Wang ◽  
Zhenglei Xie ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Intertidal Zone ◽  
Yellow River ◽  
River Estuary ◽  
Spatial Variations ◽  
Yellow River Estuary ◽  
The Yellow River

scholarly journals Effects of the Water-Sediment Regulation Scheme on the Expansion of Spartina alterniflora at the Yellow River Estuary, China

2021 ◽  
Vol 9 ◽  
Author(s):  
Shuai Fu ◽  
Shaoyan Zheng ◽  
Weilun Gao ◽  
Andong Wang ◽  
Xu Ma ◽  
...  
Keyword(s):  
Spartina Alterniflora ◽  
Landscape Metrics ◽  
Yellow River ◽  
River Estuary ◽  
Yellow River Estuary ◽  
The Yellow River ◽  
Mean Flow ◽  
Estuarine Ecosystem ◽  
Regulation Scheme ◽  
Significant Difference

In recent decades, the invasion of saltmarsh plant Spartina alterniflora (S. alterniflora) over a large part of coastal wetlands in China, including the Yellow River Estuary (YRE) as a regional economic hub and global ecosystem services hotspot, has caused increasing concern because of its serious threats to native ecosystems. During the same period, local authorities have implemented a Water-Sediment Regulation Scheme (WSRS) in the Yellow River for flood mitigation and delta restoration purposes. The altered hydrological regime has resulted in unintended changes to estuarine ecosystem. However, the direct consequence of the WSRS on the expansion of S. alterniflora remains unclear. In this study, quantitative relationship between the inter- and intra-annual expansion patterns of S. alterniflora represented by relevant landscape metrics and indicators that quantify the concurrent variations of river and sediment discharges as the proxy of the WSRS impacts were analysed over the period of Year 2011–2018, and the analyses were performed on the YRE as a whole and on five different zones subdivided based on the invasion sequence. The results showed that there was no significant difference in the inter-annual area variation of S. alterniflora between the years with and without WSRS. Compared with the years without WSRS (2016–2017), the intra-annual (monthly) increment of the various landscape metrics [i.e., NP (number of patches), CA (class area), LPI (largest patch index) and AI (aggregation index] were found to be significantly higher in the initial stage of peak growing season (June-July) than in the mid- and late stages (July-September) in the years with WSRS (2011–2015, 2018) in the subregion located close to the south bank of YRE as the most prominent impact zone. In addition, F (mean flow), Ff (number of high flow pulses), Tf (Julian date of maximum flow) and D (duration of WSRS) were identified as the explanatory variables for the intra-annual vegetation landscape pattern changes, and their relative contributions to resultant changes were also assessed. Our results broaden the understanding of estuarine hydrological disturbance as a potential driver regulating the saltmarsh vegetation, and also have implications for S. alterniflora invasion control at estuaries under changing environment.

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