scholarly journals Genetic Diversity of Rhizobia Associated with Acacia longifolia in Two Stages of Invasion of Coastal Sand Dunes

2007 ◽  
Vol 73 (15) ◽  
pp. 5066-5070 ◽  
Author(s):  
Susana Rodríguez-Echeverría ◽  
João A. Crisóstomo ◽  
Helena Freitas
Keyword(s):  
Genetic Diversity ◽  
Sand Dune ◽  
Root Nodule ◽  
Sand Dunes ◽  
Nodule Bacteria ◽  
Coastal Sand Dunes ◽  
Dune System ◽  
Coastal Sand ◽  
Acacia Longifolia ◽  
Two Stages

ABSTRACT We examined the genetic diversity of root nodule bacteria associated with the Australian legume Acacia longifolia in two stages of invasion of a coastal sand dune system. All isolates belonged to the genus Bradyrhizobium. A higher diversity was found in the long-established trees. The results suggest the introduction of exotic bradyrhizobia with the plant.

scholarly journals Effect of coastal dune restoration on the population of endangered Mongolian racerunner (Eremias argus) in the Republic of Korea

2021 ◽  
Vol 25 (2) ◽  
Author(s):  
Min Ho Chang ◽  
Jae Young Song ◽  
Kyo Soung Koo
Keyword(s):  
Sand Dune ◽  
Sand Dunes ◽  
In Situ Conservation ◽  
Coastal Region ◽  
Coastal Sand Dunes ◽  
Dune Restoration ◽  
Coastal Sand ◽  
The Republic ◽  
Special Protection

AbstractThe endangered species Mongolian racerunner (Eremias Argus), with a limited distribution in South Korea, is found only in sand dunes near waterside and forests. Therefore, species trends in this particular habitat are directly affected by habitat contamination and destruction. In this study, we examined the effects of coastal sand dune restoration on the distribution and population of E. argus. We conducted a field survey in Baramarye special protection zone, called Baramarye Coast, a part of the Taeanhaean National Park, during April and June 2016. We searched and recorded the location of E. argus and tagged them using the toe clipping method. The size of the E. argus population was estimated using the Peterson method. After the restoration of coastal sand dunes in Baramarye Coast, the population size of E. argus increased by 126–137 (21.1–55.7%) compared with that in 2008. The home range of E. argus in coastal sand dunes was significantly expanded by 4.8-fold for 95% Kernel density (KD) and 3.6-fold for 50% KD compared with that in 2008. Moreover, we confirmed that the distribution of E. argus was expanded to the restored area. Our study showed that in situ conservation is effective for endangered E. argus, distributed in particular environments such as coastal region. This study provides one more reason why coastal region must be conserved.

scholarly journals PROCESS BASED NUMERICAL MODELING AND LABORATORY EXPERIMENTS ON THE MORPHOLOGICAL CHANGE OF COASTAL SAND DUNE

2018 ◽  
pp. 36
Author(s):  
Sungwon Shin ◽  
Kideok Do ◽  
Daniel Cox
Keyword(s):  
Numerical Modeling ◽  
Large Scale ◽  
Laboratory Experiments ◽  
Sand Dune ◽  
Sand Dunes ◽  
Coastal Sand Dunes ◽  
Reliable Prediction ◽  
Sand Supply ◽  
Morphological Modeling ◽  
Coastal Sand

Coastal sand dunes are important in the nearshore environment with respect to the sand supply, ecosystem, and hazard mitigation. While the reliable prediction of the dune erosion is important, numerical modeling of this phenomenon is still challenging. In this study, a process based morphological modeling was performed and the results were compared with large-scale laboratory experimental data.

The late Quaternary stratigraphy of coastal dunes and associated deposits in southern Africa

2021 ◽  
Author(s):  
J. Knight
Keyword(s):  
Sea Level ◽  
Southern Africa ◽  
Sand Dune ◽  
Late Quaternary ◽  
Sand Dunes ◽  
Coastal Sand Dunes ◽  
Coastal Sand Dune ◽  
African Coast ◽  
Coastal Sand ◽  
And Sea Level

Abstract Coastal sand dune sediments with associated intraformational aeolianite, palaeosols and beachrock are found throughout much of the southern African coast, and have important roles as both Quaternary environmental archives and in recording the interplay of sediment supply, coastal processes and sea-level change. This paper examines the stratigraphy and palaeoenvironmental significance of coastal sand dunes and associated sediments, using examples mainly from South Africa but also with reference to the sandy coasts of Namibia and southern Mozambique. Based on morphological, sedimentary and dating evidence reported in the diverse literature, the stratigraphic relationship of coastal sand dune sediments to Marine Isotope Stages (MIS) is summarized, and a chronostratigraphic diagram for the period MIS 6 to 1 along the South African coast is used to identify spatially coherent sedimentary units that correspond to different regional climatic and sea-level phases. This framework provides a stratigraphic context to better examine the relationship between coastal sand dunes and external forcing during the late Quaternary in southern Africa, and to guide future field studies.

Mycorrhizas and Root Attributes of Plants of Coastal Sand-Dunes of New South Wales

1989 ◽  
Vol 16 (1) ◽  
pp. 141 ◽  
Author(s):  
VS Logan ◽  
PJ Clarke ◽  
WG Allaway
Keyword(s):  
Root Length ◽  
Sand Dune ◽  
New South ◽  
Sand Dunes ◽  
New South Wales ◽  
Arbuscular Mycorrhizal ◽  
Coastal Sand Dunes ◽  
South Wales ◽  
Vesicular Arbuscular ◽  
Coastal Sand

Root samples of 41 sand-dune plant species in 28 families were collected from sites along the coast of New South Wales during spring 1987. Of the species, 36 had vesicular-arbuscular mycorrhizas, with vesicles and internal and external hyphae. Among these species there was great variation in the pro- portion of root length colonised by vesicular-arbuscular mycorrhizal fungi (from 1 to 96%); in 33 species over 10% of root length was infected. Of the vesicular-arbuscular mycorrhizal species, 21 showed arbuscules, and 16 had intracellular hyphal coils. In four plant species mycorrhizas were not found in the single samples examined; ericoid mycorrhizas were present in the remaining species, Leucopogon parviflorus, but its vesicular-arbuscular mycorrhizal status could not be assessed. The results, though preliminary, may reflect a high vesicular-arbuscular mycorrhizal status of vegetation of coastal sand-dunes of New South Wales. This would be likely to enhance plant nutrition and sandbinding, and to have implications for sand-dune management.

Vegetation of a coastal sand dune system in southern New Zealand

1991 ◽  
Vol 2 (4) ◽  
pp. 531-538 ◽  
Author(s):  
Martin T. Sykes ◽  
J. Bastow Wilson
Keyword(s):  
New Zealand ◽  
Sand Dune ◽  
Coastal Sand Dune ◽  
Dune System ◽  
Coastal Sand

Elaeagnus umbellata (autumn olive).

2021 ◽  
Author(s):  
Julissa Rojas-Sandoval ◽  
Nick Pasiecznik
Keyword(s):  
Sand Dunes ◽  
Pinus Thunbergii ◽  
Shaanxi Province ◽  
Annual Rainfall ◽  
Coastal Sand Dunes ◽  
Elaeagnus Umbellata ◽  
Autumn Olive ◽  
Pioneer Tree ◽  
Coastal Sand ◽  
Deciduous Shrub

Abstract E. umbellata is an important deciduous shrub which reaches up to 5 m high and 10 cm in d.b.h. It is found in thickets and sparse woods of Japan, Korea and China. E. umbellata is a shade intolerant pioneer tree and is also commonly found along riversides and seashores in Japan. This species is growing in humid areas with 1000-4000 mm of annual rainfall in Japan. In China it is reported to grow even in semi-arid areas of Nei Menggu, Gansu and Shaanxi province, where annual rainfall is around 400 mm (Niu, 1990). E. umbellata can fix nitrogen and it is tolerant to salt winds, this species is therefore used for fixation of coastal sand dunes in Japan, and is frequently planted mixed with Pinus thunbergii as a soil improving tree. E. umbellata is also planted in eroded areas of mountainous zones to re-establish and develop vegetation. In China, E. umbellata is occasionally cultivated in gardens (Zhang, 1997).

Pans in humus podzols (Humods and Aquods) in coastal southern Queensland

Soil Research ◽  
1996 ◽  
Vol 34 (1) ◽  
pp. 161 ◽  
Author(s):  
CH Thompson ◽  
EM Bridges ◽  
DA Jenkins
Keyword(s):  
Soil Depth ◽  
Sand Dunes ◽  
Coastal Dunes ◽  
Particle Packing ◽  
Sand Mining ◽  
Coastal Sand Dunes ◽  
Organic Complex ◽  
Coastal Sand ◽  
Coastal Lowlands

An exploratory examination has been made of three different kinds of hardpans found in humus podzols (Humods and Aquods) of the coastal lowlands of southern Queensland, by means of slaking tests, a reactive aluminium test, acid oxalate and pyrophosphate extractions and electron microscopy. Samples from three indurated layers exposed by erosion or sand-mining in large coastal dunes were included for comparison. The investigation confirmed that, a pan in a bleached A2 (albic E) horizon is most likely caused by particle packing and that a pan in a black B2h (spodic) horizon is cemented by an aluminium-organic complex. Yellow-brown pans underlying black organic pans (spodic horizons) were found to be cemented by both a proto-imogolite/allophane complex and an organic substance. An inorganic reactive Al complex differing from the proto-imogolite allophane recorded in the overlying giant podzols appeared to be main cement of three indurated layers in the nearby coastal sand dunes. Mechanical disturbance of the pans, e.g. ripping, is unlikely to improve drainage and effective soil depth in the long term, because the disturbed zones are expected to be re-sealed by packed particles or by the aluminium-organic complex cement.

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