Monitoring Loss and Recovery of Salt Marshes in the Liao River Delta, China

Jia, Mingming; Wang, Zongming; Liu, Dianwei; Ren, Chunying; Tang, Xuguang; Dong, Zhicheng

doi:10.2112/jcoastres-d-13-00056.1

Cited by 34 publications

(28 citation statements)

References 13 publications

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“…Additionally, although higher productivity in wetlands has been identified, the decrease in wetland area due to urban expansion has lowered the capacity of wetlands to sequester carbon responding to global climate warming (Allred et al, ; Rooney, Bayley, & Schindler, ). Although they are important tourism resources, urbanization has progressively encroached on various wetland landscapes, such as those inhabited by Suaeda heteroptera in the Shuangtai estuary (Jia et al, ) and mangroves in southern China (Jia, Wang, Zhang, Ren, & Song, ). Based on the value coefficients provided by Costanza et al (), the declined value of wetland ecosystem service due to urbanization in China was estimated to be 0.75 billion dollars per year.…”

Section: Discussionmentioning

confidence: 99%

China's wetlands loss to urban expansion

et al. 2018

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Humans benefit from multiple ecosystem services of wetlands, but massive wetland loss has occurred worldwide due to rapid urbanization. To assess the problem, it is necessary to quantify the spatial extent of urbanization‐induced wetland loss. Here, we investigated the amount and pattern of wetland loss in China due to urbanization from 1990 to 2010, based on the China National Land Cover Database (ChinaCover). Our results show that, during these 20 years, China lost 2,883 km2 of wetlands to urban expansion, of which about 2,394 km2 took place in the eastern regions (Northeast China, North China, Southeast China, and South China). The rate of urbanization‐induced wetland loss was 2.8 times higher between 2000 and 2010 (213 km2 year−1) than between 1990 and 2000 (75 km2 yr−1). Of all wetland categories, reservoirs/ponds and marshes suffered the most severe losses. Most of the wetland loss was due to the expansion of urban built‐up areas rather than industrial or transportation lands. Four hotspots of urbanization‐induced wetland loss in China were identified: the Beijing–Tianjin metropolitan region, the Yangtze River Delta, the Jianghan Plain, and the Pearl River Delta. Urbanization and industrialization continue to unfold in China for the next few decades, and the rapid expansion of small‐ and middle‐sized cities and urban traffic networks is expected to encroach on more wetlands. Although great efforts have been made towards wetland conservation in recent years, China must prevent more wetlands from being wiped out by urbanization if the country is to ahieve its sustainable development goals.

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Section: Discussionmentioning

confidence: 99%

China's wetlands loss to urban expansion

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“…Some previous studies have shown that the red beach area experienced a dramatic loss in the 1990s and the early 2000s in the LREW mainly due to land use conversions (Jia et al. , Tian et al. ).…”

Section: Discussionmentioning

confidence: 99%

“…Some previous studies have shown that the red beach area experienced a dramatic loss in the 1990s and the early 2000s in the LREW mainly due to land use conversions (Jia et al 2015, Tian et al 2017). Our analysis based on the time series of Landsat imagery found that the red beach area also significantly decreased during the last seven years due to degradation.…”

Section: Discussionmentioning

confidence: 99%

“…The seepweed plants show a red color shortly after germination, contributing to the appearance of beautiful red beach landscapes from May to December (Jia et al. ). Suaeda is widespread in the temperate salt marshes of East Asia (He et al.…”

Section: Introductionmentioning

confidence: 99%

“…Red beach salt marshes, located in coastal intertidal areas, are dominated by saline seepweed Suaeda heteroptera. The seepweed plants show a red color shortly after germination, contributing to the appearance of beautiful red beach landscapes from May to December (Jia et al 2015). Suaeda is widespread in the temperate salt marshes of East Asia (He et al 2009(He et al , 2012 and is the only native plant that extends from low marshes to terrestrial borders in northern China (Cui et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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Human activities accelerated the degradation of saline seepweed red beaches by amplifying top‐down and bottom‐up forces

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Wei

et al. 2018

Ecosphere

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. 2018. Human activities accelerated the degradation of saline seepweed red beaches by amplifying top-down and bottom-up forces.Ecosphere 9(7):e02352. 10. 1002/ecs2.2352 Abstract. Salt marshes dominated by saline seepweed (Suaeda heteroptera) provide important ecosystem services such as sequestering carbon (blue carbon), maintaining healthy fisheries, and protecting shorelines. These salt marshes also constitute stunning red beach landscapes, and the resulting tourism significantly contributes to the local economy. However, land use change and degradation have led to a substantial loss of the red beach area. It remains unclear how human activities influence the top-down and bottom-up forces that regulate the distribution and succession of these salt marshes and lead to the degradation of the red beaches. We examined how bottom-up forces influenced the germination, emergence, and colonization of saline seepweed with field measurements and a laboratory experiment. We also examined whether top-down forces affected the red beach distribution by conducting a field survey for crab burrows and density, laboratory feeding trials, and waterbird investigations. The higher sediment accretion rate induced by human activities limited the establishment of new red beaches. The construction of tourism facilities and the frequent presence of tourists reduced the density of waterbirds, which in turn increased the density of crabs, intensifying the top-down forces such as predators and herbivores that drive the degradation of the coastal red beaches. Our results show that sediment accretion and plant-herbivory changes induced by human activities were likely the two primary ecological processes leading to the degradation of the red beaches. Human activities significantly shaped the abundance and distribution of the red beaches by altering both top-down and bottom-up ecological processes. Our findings can help us better understand the dynamics of salt marshes and have implications for the management and restoration of coastal wetlands.

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Assessing the conservation effectiveness of wetland protected areas in Northeast China

Wang

et al. 2015

Wetlands Ecol Manage

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The evaluation of conservation effectiveness for wetland protected areas (WPAs) is essential to underpin knowledge-based conservation policies and funding decisions by government and managers. In this paper, the conservation effectiveness for 28 WPAs in Northeast China from 2000 to 2012 was quantitatively evaluated using landsat thematic mapper image data and a maximum entropy model (Maxent). The spatial distribution of conservation effectiveness and the influence of human activities on conservation effectiveness were determined by combining a landscape development intensity (LDI) index and spatial analysis in a geographical information system. The results showed that the natural wetland area of all WPAs in Northeast China declined by 11.5 % and the conservation effectiveness of most of these WPAs decreased between 2000 and 2012. A significant negative correlation between the LDI index and conservation effectiveness (r = -0.824, p \ 0.01) suggested that human activities were responsible for the low conservation effectiveness of WPAs. The WPAs with the high conservation effectiveness were mainly located in the Da-Xing'an and Xiao-Xing'an Mountains, where anthropogenic activities were limited. The reduction in the conservation effectiveness of WPAs in the Songnen and Sanjiang Plains, which showed the most degradation, was due to conversion of wetlands to croplands. This research offers an efficient and effective method to evaluate the conservation effectiveness of WPAs. The results of this study will inform future ecological conservation and management of WPAs in China.

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Monitoring Loss and Recovery of Salt Marshes in the Liao River Delta, China

Cited by 34 publications

References 13 publications

China's wetlands loss to urban expansion

China's wetlands loss to urban expansion

Human activities accelerated the degradation of saline seepweed red beaches by amplifying top‐down and bottom‐up forces

Assessing the conservation effectiveness of wetland protected areas in Northeast China

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