Snakes are the principal nest predators of the threatened reed parrotbill in a coastal wetland of eastern China

Coastal ecological protection and restoration projects aimed to restore and recover the ecological environment of coastal wetland with high-intensity human reclamation activity, while the integrity of the coastal wetland system with human reclamation activity and the ability of individual land use types to control the overall system were not fully considered. In this study, a six-stage land use conversion network was constructed by using a complex network model to analyze coastal land use dynamic changes in the coastal reclamation area located in eastern China from 1977 to 2016. The results showed that land use types had gradually transformed from being dominated by natural types to artificial types, and the speed of transformation was accelerating. The proportion of un-reclaimed area decreased from 93% in 1977 to 46% in 2007, and finally fell to 8% in 2014 and 2016. Tidal flat and halophytic vegetation were the main output land use types, while cropland, woodland and aquaculture pond were the main input land use types. Cropland had the highest value of betweenness centrality, which played a key role in land use change from 1992 to 2014. The land use system of the coastal reclamation area was the most stable in 2002–2007, followed by 1984–1992, and the most unstable in 2007–2014. The Chinese and local government should carry out some measures to improve the land use in coastal wetland ecosystems, including the allocation and integration of land use for production space, living space, and ecological space, and develop multi-functionality of land use to realize the coastal high-quality development and coastal ecological protection and restoration.

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Coastal Wetland Mapping with Sentinel-2 MSI Imagery Based on Gravitational Optimized Multilayer Perceptron and Morphological Attribute Profiles

Remote Sensing ◽

10.3390/rs11080952 ◽

2019 ◽

Vol 11 (8) ◽

pp. 952 ◽

Cited By ~ 4

Author(s):

Aizhu Zhang ◽

Genyun Sun ◽

Ping Ma ◽

Xiuping Jia ◽

Jinchang Ren ◽

...

Keyword(s):

Multilayer Perceptron ◽

Coastal Wetlands ◽

Coastal Wetland ◽

Eastern China ◽

Jiaozhou Bay ◽

Superior Performance ◽

Wetland Mapping ◽

Mlp Classifier ◽

Morphological Attribute ◽

Sentinel 2

Coastal wetland mapping plays an essential role in monitoring climate change, the hydrological cycle, and water resources. In this study, a novel classification framework based on the gravitational optimized multilayer perceptron classifier and extended multi-attribute profiles (EMAPs) is presented for coastal wetland mapping using Sentinel-2 multispectral instrument (MSI) imagery. In the proposed method, the morphological attribute profiles (APs) are firstly extracted using four attribute filters based on the characteristics of wetlands in each band from Sentinel-2 imagery. These APs form a set of EMAPs which comprehensively represent the irregular wetland objects in multiscale and multilevel. The EMAPs and original spectral features are then classified with a new multilayer perceptron (MLP) classifier whose parameters are optimized by a stability-constrained adaptive alpha for a gravitational search algorithm. The performance of the proposed method was investigated using Sentinel-2 MSI images of two coastal wetlands, i.e., the Jiaozhou Bay and the Yellow River Delta in Shandong province of eastern China. Comparisons with four other classifiers through visual inspection and quantitative evaluation verified the superiority of the proposed method. Furthermore, the effectiveness of different APs in EMAPs were also validated. By combining the developed EMAPs features and novel MLP classifier, complicated wetland types with high within-class variability and low between-class disparity were effectively discriminated. The superior performance of the proposed framework makes it available and preferable for the mapping of complicated coastal wetlands using Sentinel-2 data and other similar optical imagery.

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Characterization of the salt marsh soils and visible-near-infrared spectroscopy along a chronosequence of Spartina alterniflora invasion in a coastal wetland of eastern China

Geoderma ◽

10.1016/j.geoderma.2019.114138 ◽

2020 ◽

Vol 362 ◽

pp. 114138 ◽

Cited By ~ 2

Author(s):

Ren-Min Yang

Keyword(s):

Infrared Spectroscopy ◽

Salt Marsh ◽

Spartina Alterniflora ◽

Near Infrared Spectroscopy ◽

Near Infrared ◽

Coastal Wetland ◽

Eastern China ◽

Spartina Alterniflora Invasion

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Consequences of short-term C4 plant Spartina alterniflora invasions for soil organic carbon dynamics in a coastal wetland of Eastern China

Ecological Engineering ◽

10.1016/j.ecoleng.2013.09.056 ◽

2013 ◽

Vol 61 ◽

pp. 50-57 ◽

Cited By ~ 64

Author(s):

Wen Yang ◽

Hui Zhao ◽

Xinglong Chen ◽

Shenglai Yin ◽

Xiaoli Cheng ◽

...

Keyword(s):

Organic Carbon ◽

Soil Organic Carbon ◽

Spartina Alterniflora ◽

Coastal Wetland ◽

Eastern China ◽

Carbon Dynamics ◽

C4 Plant ◽

Short Term ◽

Soil Organic Carbon Dynamics

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Biochar and Fulvic Acid to Activate Soil Fertility for Achieving Agro-ecology Benefits in a Newly Reclaimed Coastal Wetland of China

Emirates Journal of Food and Agriculture ◽

10.9755/ejfa.2019.v31.i6.1967 ◽

2019 ◽

pp. 459

Author(s):

Yunpeng Sun, Jinsong Yang, Rongjiang Yao ◽

Xiaobing Chen

Keyword(s):

Grain Yield ◽

Fulvic Acid ◽

Nitrogen Fertilizer ◽

Coastal Wetland ◽

Saline Soil ◽

Eastern China ◽

Soil Bulk Density ◽

Nitrogen And Phosphorus ◽

Significant Difference ◽

Short Time

Reclamation of coastal tidal flat lands for obtaining more lands has lasting for many years in China. More attention should be paid on soil and water pollution for protecting coastal ecosystem during the period of saline soil amelioration. A field experiment was conducted for two years in eastern China to investigate the effects of different rates of biochar (BC) (at 0, 7.5, and 30 t ha-1) and/or fulvic acid (FA) (at 0, 0.075 t ha-1) with/without nitrogen (N) fertilizer on the soil physical, chemical, and nutritional properties, as well as crop yield, with a maize-barley rotation. Results showed that N application caused soil compaction, and BC+FA treatments decreased soil bulk density (ranging from 1.22 to 1.28 g cm3) and improved water retention under the condition. Extreme precipitation accelerated soil de-salinization during the crop cultivation (soil EC decreased to the low value ranging from 127 to 141 μS cm-1, after maize harveseted). N addition improved grain yield of maize (increased by 105% under BC30+FA+N, compared with the CK treatment), but there was no significant difference between the N and no-N added treatments. However, the grain yield and straw weight of barley in with-N treatments were twice as much as those of the no-N treatments. The soil nutrion contents (total nitrogen and phosphorus content) after maize and barley crops were higher, under no-N treatments compared to the with-N treatments. A lower pH (8,78) and higher Ca2+ + Mg2+ content (0.24 ~ 0.26 g kg-1) existed in BC30+FA treated plots after maize and barley crops. Replacement of nitrogen fertilizer by BC and FA in the coastal saline soil was feasible in a short time. Therefore, nitrogen fertilizer usage should be regulated for protecting the coastal ecology system, and also achieving agricultural benefits.

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