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Surface soils (0–20 cm) were collected at five sampling sites along a 250-m sampling zone perpendicular to a tidal creek in the T. chinensis wetland of the Yellow River Delta of China in June, August and November of 2007 and April of 2008. Soils were assessed for the spatial and temporal distributions of metals (As, Ni, Cr, Zn, Pb, Cd and Cu) and the potential risk to the T. chinensis wetland. Our...
Metal distributions were monitored along soil profiles and their sources as well as ecological risks were assessed in tidal zone (T), petroleum exploitation zone (P) and restoration zone (R) under different vegetation covers- Phragmites australis (p), Suaeda salsa (s) and bare land (b) in Yellow River estuary (YRE). In the three zones, mean concentrations of metals and mean values of potential ecological...
The Mediterranean coast holds a wide and rich variety of wetlands, some of which are protected by international laws, but at the same time have been historically subjected to threatening activities such as agriculture, pollution and aquifer overexploitation. As part of a conservation and restoration project at the Marjal dels Moros coastal wetland (Eastern Iberian Peninsula) we initiated investigations...
The abundant riparian wetlands supported by the complex river network in Pearl River Delta (PRD) are under an intensely anthropogenic disturbance that threatens the local ecological environment. This paper examined the benthic invertebrate diversity and biomass within the Pearl River through a field study. A fieldwork was conducted to assess a hydrological connectivity gradient among the main channel...
In this study, the temporal and spatial trends of ten antibiotics belong to four different groups in aqueous and sediment matrices were investigated in the intertidal zone of Bohai Bay as a single object. The total concentrations of those antibiotics ranged from 41.53 to 222.43 ng L−1 and 7.71 to 130.36 ng g−1 in the surface water and sediment, respectively, and they contained higher levels and detected...
A long-term monitoring and restoration study was implemented from 2008 to 2014 at the watershed scale in the Napahai wetland, a typically degenerative closed and half-closed alpine wetland in the Northwest Yunnan Plateau, China. After restoration, the vegetation of the swamp, swamp meadow, and meadow in the transitional zone improved constantly, as well as the soil properties, such as water content,...
Characterization of the soil redox status is important for pedogenesis but simple field methods for monitoring are limited. Recently, we introduced manganese (MnIII,IV) oxide-coated redox bars as an indicator for reducing conditions in soils. In this study, we compared these redox bars with well-established iron (FeIII) oxide-coated bars. For a 5-month monitoring period, we quantified the monthly...
To be identified as a wetland under U.S. Federal regulations, a site must, under normal circumstances, support vegetation dominated by hydrophytes. A list of hydrophytes and their wetland indicator rating is published by the U.S. Army Corps of Engineers as the National Wetland Plant List (NWPL) and is the basis for assessing the vegetation criteria of Federal wetland delineation manuals. Ratings are...
Most studies involving the consumption of fruit and subsequent secondary dispersal of seeds by vertebrates point to birds and mammals as the main agents of dispersal. However, evidence suggests that fish also perform this important ecological role. After observing the consumption of Banara arguta fruits by fish of the Pantanal floodplain, we decided to investigate the disperser role of the freshwater...
Amphibians are declining throughout the United States and worldwide due, partly, to habitat loss. Conservation practices on the landscape restore wetlands to denitrify tile drainage effluent and restore ecosystem services. Understanding how water quality, hydroperiod, predation, and disease affect amphibians in restored wetlands is central to maintaining healthy amphibian populations in the region...
The main aim of the study was to assess the gradient distribution and composition diversity of microbial taxa using a spatial scale with physicochemical heterogeneity between reclamation area and non-reclamation area. The grid method was utilized to set the sample belt and sample square. The Illumina MiSeq platform was used to study the gradient distribution of rhizosphere bacteria in reclamation...
In much of the western United States, riparian zones are shifting from native woody and herbaceous species to invasive grasses, potentially altering plant water use and availability. Compared to the woody species they often replace, dense grass stands may have higher productivity and transpiration, causing them to use more water. We investigated evidence of this effect in semiarid eastern Washington,...
Environmental flows play an important role in sustaining or enhancing ecosystem services provided by wetlands. In this study, using an improved input-state-output approach, we evaluated ecosystem service values to assess the ability of freshwater releases to improve the ecosystem of China’s Yellow River Delta Wetlands. We used emergy analysis to value the inputs, state, and outputs of the ecosystem...
Land reclamation directly changes the local coastal morphology, causing potential ecological consequences. To quantify how land reclamation influences the shoreline change, we employed shape entropy, in addition to traditional parameters, including shoreline length, land area change rate, and fractal dimension, extracted from SPOT satellite images from a number of representative years throughout two...
To investigate the spatial and seasonal variations of soil organic carbon (SOC) and total nitrogen (TN) contents and stocks in tidal salt marsh soils, 15 cores to a depth of 40 cm were collected in five sampling sites along a sampling belt during three seasons. Our results showed that higher SOC and TN contents occurred in the surface soils in three sampling seasons. Spatial distributions of SOC and...
A field experiment was conducted on three different water levels and four salinity levels to investigate the effects of water level and salinity on the total sulfur (TS) content of marsh soil in the Yellow River Delta of China. The total sulfur content of surface and subsurface soils from incubated soil cores were measured under different water and salinity levels on three sampling dates. Our results...
After tidal restriction in salt marshes, the composition of the vegetation changes from predominance of halophyte species to predominance of glycophytes. However, little is known about how different plant traits and stress types influence these vegetation changes. In this study, we propose the use of relative stress tolerance curves to couple stress tolerance and competitive abilities in a dynamic...
This paper proposes an integrated approach to the assessment of estuarine habitat suitability based on a fuzzy logic method. Specifically, fuzzy logic is used to construct the Habitat Suitability Index (HSI) as a supplementary metric when field data is scarce. The HSI is used in turn to build the Habitat Aggregation Index (HAI) that considers the internal patches and fragmentation of the habitat....
Freshwater supplementation is often used for wetland restoration and ecosystem health protection. Understanding temporal patterns of aquatic metabolism caused by freshwater supplementation may help optimize wetland restoration designs. We investigated the short-term changes in aquatic metabolism and potential driving factors at two sites dominated by Phragmites australis and Suaeda salsa, respectively,...
For wetland restoration success to be maximized, restoration managers need better information regarding how the frequency, depth, and duration of flooding affect soil chemistry and the survival, growth, and morphology of targeted plant species. In a greenhouse study we investigated the impact of four different flooding durations (0 %, 40 %, 60 %, and 100 %) on soil physicochemistry and the responses...
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