Effect of Hydrological Connectivity on Soil Carbon Storage in the Yellow River Delta Wetlands of China

Feng, Jiu-Ge; Jinfeng, Liang; Li, Qianwei; Zhang, Xiaoya; Yue, Yi; Gao, Jun-Qin

doi:10.1007/s11769-021-1185-9

Cited by 10 publications

(5 citation statements)

References 47 publications

(67 reference statements)

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“…The Yellow River Delta (117 • 30 -119 • 20 E, 36 • 53 -38 • 20 N) is located in the northern part of Shandong Province, China, and lies between Bohai Bay and the mouth of Laizhou Bay [34,35]. It is the second largest river delta in China [36] and the most rapidly evolving delta in the world [37].…”

Section: Study Area and Data Sources 21 Study Areamentioning

confidence: 99%

Study on Spatiotemporal Evolution of the Yellow River Delta Coastline from 1976 to 2020

Zhu

Dai

et al. 2021

Remote Sensing

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The Yellow River Delta in China is the most active one for sea–land changes over all deltas worldwide, and its coastline evolution is critical to urban planning and environmental sustainability in coastal areas. Existing studies rarely used yearly temporal resolution, and lack more detailed and quantitative analysis of coastline evolution characteristics. This paper used visual interpretation to extract the coastline of the Yellow River Delta in year interval Landsat images for 45 years from 1976 to 2020, and analyzed the spatiotemporal characteristics of the coastline evolution through statistical methods such as calculating change values and change rate. The main results are as follows: (1) overall, the coastline of the Yellow River Delta presented a spatial pattern involving northern landward retreat and southern seaward expansion. Since 1990, the Yellow River Delta has entered a period of decline. In addition, the length of the artificial coastline increased by about 55 km; (2) in the Qingshuigou region, the land area and the coastline length increased first and then stabilized. The southeastern part of the Qingshuigou was in a state of erosion, while the northeastern part was expanding toward the sea along the north direction; (3) in the Diaokou region, the land area has been decreasing, but the reduction rate has gradually slowed down. The main conclusions are as follows: (1) through the research on the evolution model and mechanism of the coastline of the Yellow River Delta, it was found that human factors and natural factors were the two major driving factors that affect the evolution of the coastline; (2) a river branch appeared in the northern part of the Qingshuigou region in 2014 and became a major branch in 2020, which would affect the development of the coastal region of Chengdao. This study is important for better understanding the evolution pattern of the Yellow River Delta coastline and will help to provide guidance for coastline management and resource exploitation.

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Section: Study Area and Data Sources 21 Study Areamentioning

confidence: 99%

Study on Spatiotemporal Evolution of the Yellow River Delta Coastline from 1976 to 2020

Zhu

Dai

et al. 2021

Remote Sensing

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“…Furthermore, hydrological connectivity mainly affects plant diversity and distribution characteristics by altering microtopography, as indicated by related studies (Cui et al 2016). The impact of hydrological connectivity on salt marsh vegetation is mainly concentrated in tidal areas (Liu et al 2020b;Geng et al 2021), which tend to have higher hydrological connectivity (Passalacqua et al 2013;Hiatt and Passalacqua 2015;Feng et al 2021). Tidal creeks facilitate the exchange of water, nutrients, sediments, and organisms with the open ocean environment and play an essential role in tidal areas (Liu et al 2020b), connecting salt marshes to the ocean (Colón-Rivera et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Quantifying the Impact of Hydrological Connectivity on Salt Marsh Vegetation in the Liao River Delta Wetland

Chen

Cong

et al. 2023

Wetlands

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Salt marshes play a critical role in ecological functioning and have significant economic value. Hydrological elements are considered to be one of the major contributors to salt marsh degradation. However, how hydrological connectivity affects salt marshes remains poorly investigated at fine scales. This paper used spatial analysis and statistical methods to investigate the impact of hydrological connectivity on the spatial and temporal distribution characteristics of salt marsh vegetation in two natural succession areas of the Liao River Delta wetland in 2020 and 2021 by selecting vegetation area, NDVI, tidal creeks area, distance to tidal creeks, and the Index of Connectivity, using 1 m Gaofen-2 data and 0.2 m aerial topographic data. The study found that the area and growth status of vegetation and the overall connectivity in 2021 were better than that in 2020, while the west bank of the Liao River was better than that on the east bank. Phragmites australis showed a round island distribution pattern primarily at the end of tidal creeks. The differences between different hydrological connectivity and vegetation area were significant in 2021. The vegetation area was the largest under poor and moderate connectivity. We also found that within a distance range of 0-6 m from tidal creeks, the vegetation area increased with increasing distance, but beyond 6 m, the vegetation area decreased with increasing distance. Our results showed that poor and moderate connectivity conditions were more suitable for vegetation growth. The threshold value of 6 m can provide an important reference for wetland vegetation restoration in the Liao River Delta wetland.

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“…The conventional method for filling depressions in DEM typically relies on calculating the slope based on the height difference between the river and its banks, as well as the direction of the river flow. However, in flat riverine landscapes, where the riverbed is at or above the level of the riverbanks, traditional DEM-based methods are unsuitable for water feature extraction [7,16]. Therefore, an alternative approach known as the water index method has been introduced.…”

Section: Introductionmentioning

confidence: 99%

Temporal and Spatial Changes of Hydrographic Connectivity with the Development of Agriculture, Industry, and Urban Areas: A Case Study of the Yellow River Basin in Henan Province during the Last Two Decades

Li,

Wei,

Zhou

et al. 2023

Water

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Hydrographic connectivity stands as a crucial indicator for analyzing the structural dynamics within river and lake systems. Nevertheless, the impact of changes in hydrographic connectivity, including structural and functional connectivity within extensive river basins, on the progression of agriculture, industry, and habitation remain scarcely explored. To bridge this gap, Henan province in China, traversed by the Yellow River, was selected as a case study. The extraction of water information was facilitated by employing a remote sensing-based Modified Normalized Difference Water Index (MNDWI), while Set Pair Analysis was utilized to construct a hydrographic connectivity evaluation system for the study area spanning the preceding two decades (2000–2020). The results revealed that for structural connectivity, agricultural land covers over 50% and prevails as the primary land-use type; reservoir and lake areas initially increased before subsequently decreasing. Human activities have exerted a profound influence on these changes. Meanwhile, the structural form of the water system has gradually improved, exhibiting an increasing complexity of river networks and a stabilizing connectivity configuration. As for functional connectivity, the natural function remains well-preserved, while the social function demonstrates a positive correlation with the expansion of industrial activities, eventually achieving an excellent level from a moderate level. Overall, agriculture dominated the water usage structure, with residential water consumption steadily increasing, thereby positively impacting hydrographic connectivity in the studied area.

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Effect of Hydrological Connectivity on Soil Carbon Storage in the Yellow River Delta Wetlands of China

Cited by 10 publications

References 47 publications

Study on Spatiotemporal Evolution of the Yellow River Delta Coastline from 1976 to 2020

Study on Spatiotemporal Evolution of the Yellow River Delta Coastline from 1976 to 2020

Quantifying the Impact of Hydrological Connectivity on Salt Marsh Vegetation in the Liao River Delta Wetland

Temporal and Spatial Changes of Hydrographic Connectivity with the Development of Agriculture, Industry, and Urban Areas: A Case Study of the Yellow River Basin in Henan Province during the Last Two Decades

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