Improving wetland ecosystem health in China

Liu, Weiwei; Guo, Zhiyong; Jiang, Bo; Lu, Fei; Wang, Henian; Wang, Daan; Zhang, Manyin; Cui, Lijuan

doi:10.1016/j.ecolind.2020.106184

Cited by 67 publications

(55 citation statements)

References 39 publications

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“…With the government-dominated wetland conservation and restoration efforts (Liu et al 2020c), the concentrations of most heavy metals in Hengshui Lake have decreased from 2005 to 2020 (Table 2), resulting in decreases in the single factor pollution index, composite pollution index, enrichment factors, and the potential ecological risk index values during the study periods (Figs. 3,4,5,and 6).…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, wetland sediments act as sinks of heavy metals, and may in turn act as sources (Tang et al 2014). In view of the signi cant roles that sediment-bound metals play in water quality and wetland ecosystem health (Hsu et al 2016;Liu et al 2020c), investigation of heavy metals contamination and assessment of the degree of pollution and ecological risk have been extensively researched, and the results might have had signi cant implications in more effective management of wetland ecosystems.…”

Section: Introductionmentioning

confidence: 99%

“…With the rapid development of economy and industrialization, heavy metals contamination of wetland sediment in China has become increasingly serious, especially in the Southeast coastal rivers and the Zhu River of China (Tang et al 2014). Since the implementation of multiple government-dominated wetland conservation and restoration policies in recent years, wetland ecosystem health in China has improved signi cantly (Liu et al 2020c), and these policies have also likely contributed to the mitigation of wetland heavy metals contamination. Determining the temporal and spatial variations of heavy metals is critical for delineating the tendency of temporal changes and the reasons of spatial variability, deducing the dual in uence of anthropogenic activities and wetland conservation on heavy metals pollution, and providing valuable conservation strategies for further wetland management.…”

Section: Introductionmentioning

confidence: 99%

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Spatial-Temporal Variations for Pollution Assessment of Heavy Metals in Hengshui Lake of China

Liu¹,

Guo²,

Wang³

et al. 2021

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A comprehensive analysis of the spatial and temporal variations of heavy metals in wetland sediment can delineate the changes in possible contamination sources, providing valuable conservation strategies for further wetland management. Using pollution index, enrichment factors, and potential ecological risk index, the spatial and temporal variations in heavy metals (Cd, Hg, As, Pb, Cr, Cu, and Zn) were evaluated in Hengshui Lake in north China from 2005 to 2020. The results demonstrated that the concentrations and assessment index for most heavy metals all decreased, with that of As decreasing the most (-54.3%), which mainly benefited from the implementation of a series of ecological conservation and restoration projects. Although the assessment indexes for most heavy metals indicated non-pollution status, Hg and Cd exhibited medium enrichment and moderate potential ecological risk. Especially for Cd, the related-indexes increased by 859.3%. Furthermore, the high pollution was mainly distributed nearby the regions of dense enterprises and the spilled into of water (i.e., Wangkou sluice, the Jizhou Small Lake and its causeway). This was primarily attributed to discharge of industrial wastewater and Cd-polluted ecological diversion water. These findings demonstrated the necessity of continued and targeted implementation of wetland conservation and restoration projects, identified possible contamination sources and important pollution regions that could provide insights into contamination control options and targeted management strategies for Hengshui Lake.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spatial-Temporal Variations for Pollution Assessment of Heavy Metals in Hengshui Lake of China

Liu¹,

Guo²,

Wang³

et al. 2021

Preprint

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“…An important step toward the sustainable development of the wetland ecosystem in the TRB is prioritizing the restoration of important wetlands that currently have seriously degraded ecological functions. This would involve increasing ecological investment, providing farmers with ecological compensation, strictly controlling the trend toward increased wetland area shrinkage and landscape fragmentation, building wetland ecological corridors and protection networks, improving the quality and stability of wetland ecosystems, and gradually restoring wetland ecological functions, as well as forming a multi-point ecological protection and governance of nature reserves, wetland parks, and important wetlands [46,47].…”

Section: Implications Of Natural Wetland Managementmentioning

confidence: 99%

Conversion of Natural Wetland to Farmland in the Tumen River Basin: Human and Environmental Factors

2021

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Wetlands play an important role in the terrestrial ecosystem. However, agricultural activities have resulted in a significant decrease in natural wetlands around the world. In the Tumen River Basin (TRB), a border area between China, the Democratic People’s Republic of Korea (DPRK), and Russia, natural wetlands have been reclaimed and converted into farmland, primarily due to the migration practices of Korean-Chinese. To understand the spatial and temporal patterns of this conversion from wetlands to farmland, Landsat remote sensing images from four time periods were analyzed. Almost 30 years of data were extracted using the object-oriented classification method combined with random forest classification. In addition, statistical analysis was conducted on the conversion from natural wetland to farmland and from farmland to wetland, as well as on the relationship between the driving factors. The results revealed that a loss of 49.2% (12,540.1 ha) of natural wetlands in the Chinese portion of the TRB was due to agricultural encroachment for grain production. At the sub-basin scale, the largest area of natural wetland converted into farmland in the past 30 years was in the Hunchun River Basin (HCH), which accounts for 22.0% (2761.2 ha) of the total. Meanwhile, 6571.4 ha of natural wetlands, mainly in the Gaya River Basin (GYH), have been restored from farmland. These changes are closely related to the migration of the agricultural populations.

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“…The Momoge wetlands of the Songnen Plain are typical wetlands that are severely affected by intensive human activity [10]. However, a series of conservation and restoration policies for wetlands have been implemented in China in recent years, which have played an important role in reconstructing the health of wetland ecosystems [11].…”

Section: Introductionmentioning

confidence: 99%

Disentangling Responses of the Subsurface Microbiome to Wetland Status and Implications for Indicating Ecosystem Functions

et al. 2021

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In this study, we analyzed microbial community composition and the functional capacities of degraded sites and restored/natural sites in two typical wetlands of Northeast China—the Phragmites marsh and the Carex marsh, respectively. The degradation of these wetlands, caused by grazing or land drainage for irrigation, alters microbial community components and functional structures, in addition to changing the aboveground vegetation and soil geochemical properties. Bacterial and fungal diversity at the degraded sites were significantly lower than those at restored/natural sites, indicating that soil microbial groups were sensitive to disturbances in wetland ecosystems. Further, a combined analysis using high-throughput sequencing and GeoChip arrays showed that the abundance of carbon fixation and degradation, and ~95% genes involved in nitrogen cycling were increased in abundance at grazed Phragmites sites, likely due to the stimulating impact of urine and dung deposition. In contrast, the abundance of genes involved in methane cycling was significantly increased in restored wetlands. Particularly, we found that microbial composition and activity gradually shifts according to the hierarchical marsh sites. Altogether, this study demonstrated that microbial communities as a whole could respond to wetland changes and revealed the functional potential of microbes in regulating biogeochemical cycles.

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Improving wetland ecosystem health in China

Cited by 67 publications

References 39 publications

Spatial-Temporal Variations for Pollution Assessment of Heavy Metals in Hengshui Lake of China

Spatial-Temporal Variations for Pollution Assessment of Heavy Metals in Hengshui Lake of China

Conversion of Natural Wetland to Farmland in the Tumen River Basin: Human and Environmental Factors

Disentangling Responses of the Subsurface Microbiome to Wetland Status and Implications for Indicating Ecosystem Functions

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