Spatial-temporal changes of China&amp;rsquo;s mangrove forests over the past 50 years: An analysis towards the Sustainable Development Goals (SDGs)

Jia, Mingming; Wang, Zongming; Mao, Dehua; Huang, Chunlin; Lu, Chunxia

doi:10.1360/tb-2020-1412

Cited by 56 publications

(40 citation statements)

References 20 publications

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“…With more extensive mangrove protections and establishments of natural reserves, the areal extent of mangroves in China overall changed from a declining period to an increasing period in ca . 2000 (Hu et al., 2018; Jia et al., 2018; Jia et al., 2021). Therefore, in this study, we divided the study period of 1986–2020 into pre‐2000 and post‐2000 conservation periods, and conducted spatially explicit comparisons of mangrove AGB accumulation rates during the young growth stage between these two periods.…”

Section: Methodsmentioning

confidence: 99%

“…More than half of Chinese mangroves have been lost by the early 1990s, after which Chinese government has made much greater efforts on mangrove conservation and restoration (Chen et al., 2009; Hu et al., 2018; Jia et al., 2018; Jia et al., 2021). As a consequence, the areal extent of Chinese mangroves stopped declining and began to increase from ca .…”

Section: Introductionmentioning

confidence: 99%

“…As a consequence, the areal extent of Chinese mangroves stopped declining and began to increase from ca . 2000 (Jia et al., 2018; Jia et al., 2021; Wang et al., 2020b). It was reported that young mangroves accounted for ca .…”

Section: Introductionmentioning

confidence: 99%

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Stronger conservation promotes mangrove biomass accumulation: Insights from spatially explicit assessments using UAV and Landsat data

Zhu

Huang

Zhou

et al. 2022

Remote Sens Ecol Conserv

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Chinese mangroves have been recovered in area over the past two decades from previous declining trend, and about half of existing mangroves are still in their young growth stage. This provides a unique opportunity to assess mangrove conservation by examining the growth dynamics of young mangroves over different conservation periods. However, we are currently short of effective assessment tools for spatially explicit quantification of mangrove conservation effects. To fill up this gap, we proposed a novel remote sensing approach using readily available unmanned aerial vehicle (UAV) and Landsat enhanced vegetation index (EVI) data to assess the spatial evolution of aboveground biomass (AGB) of young mangroves. With the space-for-time hypothesis, the approach implemented with an empirical EVI-height-AGB equation was tested in four subtropical estuarine mangroves in the southeastern coast of China. The results indicated: (a) the UAV-based Structure from Motion (SfM) technology served as an effective and low-cost means for capturing the spatial heterogeneity of mangrove canopy heights; (b) a maximum stand age of 15 years could be used to define the young growth stage of mangroves, for which the EVI-height relationships could be described by exponential equations without suffering significant spectral saturation effects; (c) mangrove forests had overall faster annual AGB accumulation during the young growth stage over the post-2000 versus pre-2000 conservation period. This study is one of the first attempts to develop a remote sensing approach for quantifying spatially explicit AGB accumulation rates of young mangroves. It highlights the practicability and advantage of the UAV-SfM technology and confirms that stronger conservation efforts promote mangrove AGB accumulation over the past two decades. The developed EVIheight-AGB framework fueled with readily available UAV and Landsat data provides a unique tool for assessing mangrove conservation effects from landscape to regional scales.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stronger conservation promotes mangrove biomass accumulation: Insights from spatially explicit assessments using UAV and Landsat data

Zhu

Huang

Zhou

et al. 2022

Remote Sens Ecol Conserv

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“…The MWS is close to Qinjiang river estuary and the intensive aquaculture area, whereas QZP is in the tourist areas of Qinzhou and also close to Qinzhou Port. The mangrove forest areas involved in LZB, MWS, QZP, and SK are 7.34 km 2 (Li et al, 2018a), 22.87 km 2 (Jia et al, 2021), 2.00 km 2 (Huang, 2017), and 9.22 km 2 (Jia et al, 2021), respectively (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Tidal variation shaped microplastic enrichment patterns in mangrove blue carbon ecosystem of northern Beibu Gulf, China

et al. 2022

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Mangroves are considered to be a sink for microplastics (MPs) due to their unique characteristics. Previous studies mainly focused on the spatial distribution of MPs, but few researchers have addressed the influence of tidal variation on this distribution, especially since the MP total number in mangroves was unknown. In this study, surface sediment samples were collected in mangroves from the Beibu Gulf, South China Sea, and the abundance, composition, and number of MPs were investigated. The results showed that MPs were widely present in all mangrove sediment samples, with abundances ranging from 26.67 ± 9.43 to 239.94 ± 37.80 items/kg. The distribution of MPs was heterogeneous among different sampling sites, with the highest levels in the Shankou (SK) area. The MP abundance in the same mangrove forest gradually increased from the low tidal zone to the high tidal zone, with the enrichment factor ranging from 1.50 to 4.00. The MP abundance was significantly correlated with particulate organic carbon (POC) (n = 12, R = 0.664, p < 0.05). Results showed that mangroves had an interception effect on MPs and factors affecting MP distribution in mangrove sediments included not only tides but also human activities, such as aquaculture, agriculture, and residential life. Finally, this paper estimated the MP total number in mangroves at different sampling areas and tidal zones, and the middle tidal zone was considered to be more accurate for MP pollution assessment in mangroves.

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“…To achieve general representativeness of the data and analysis accuracy, we divided the 54 mangrove areas into 16 regions by geographic location, and the areas with less survey data were excluded. These areas experience a subtropical and tropical marine monsoon climate with an annual average temperature of 21–25 °C [ 29 ]. The tides tend to vary, with regular semi-diurnal tides in Fujian, irregular semi-diurnal tides in Guangdong, regular diurnal tides in Guangxi, and irregular semi-diurnal tides and irregular diurnal tides in Hainan and Taiwan.…”

Section: Methodsmentioning

confidence: 99%

Distribution Pattern of Mangrove Fish Communities in China

Zhao

Wang

et al. 2022

Biology

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Mangroves are among the most productive marine and coastal ecosystems and play an important role in maintaining the stability and diversity of fish communities. To explore the structure of mangrove fish communities in China, we compiled previous studies, monographs, and two databases on 54 mangrove areas published in the past 30 years. Mangrove fish communities in China comprised Osteichthys (597 species) and Chondrichthyes (14 species), representing 611 species in 344 genera, 117 families, and 28 orders. Perciformes were the predominant taxon, with 350 species in 52 families, accounting for 57% of the total species richness. Reef fish accounted for 29.62%. With regard to feeding groups, there were 328 carnivorous species (53.68%), 214 omnivorous species (35.02%), 41 herbivorous species (6.71%), and 28 detritivores species (4.58%). Classified by body size, 57.61% were small-sized, 24.22% medium-sized, and 18.17% were large-sized fishes. A total of 5.23% (32 species) of these mangrove fish are currently on IUCN red lists, i.e., 2 species are critically endangered, 4 are endangered, 12 are vulnerable, and 14 are near threatened. Cluster analyses shows that Chinese mangroves fish were divided into two categories, i.e., coastal mangrove and island mangrove type. This is closely related to the distribution of reef fish. Moreover, the number of fish species showed a strong positive correlation with mangrove area, but not with latitude. The main reasons may be the subtropical and tropical geographic locations, as well as the characteristics of the South China Sea and the Taiwan Warm Current. The size and integrity of mangrove area are crucial to the local ecosystems; thus, protecting and restoring mangroves is of great significance to large-scale ecosystem-stability and local biodiversity.

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Spatial-temporal changes of China’s mangrove forests over the past 50 years: An analysis towards the Sustainable Development Goals (SDGs)

Cited by 56 publications

References 20 publications

Stronger conservation promotes mangrove biomass accumulation: Insights from spatially explicit assessments using UAV and Landsat data

Stronger conservation promotes mangrove biomass accumulation: Insights from spatially explicit assessments using UAV and Landsat data

Tidal variation shaped microplastic enrichment patterns in mangrove blue carbon ecosystem of northern Beibu Gulf, China

Distribution Pattern of Mangrove Fish Communities in China

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