scholarly journals A middle Eocene treefall pit and its filling: a microenvironmental study from the onset of a forest mire in the Geiseltal (Germany)

2021 ◽  
Author(s):  
Volker Wilde ◽  
Walter Riegel
Keyword(s):  
Middle Eocene ◽  
Striking Difference ◽  
Mining District ◽  
Herbaceous Plant ◽  
Parent Plant ◽  
Swamp Forest ◽  
Large Tree ◽  
Large Trees ◽  
Open Cast Mine ◽  
Open Cast

AbstractThe treefall pit of a large tree at the base of the middle Eocene Mittelkohle has been studied in the former open-cast mine Neumark Nord of the Geiseltal Mining District. Above a light clastic soil, the sedimentation in the pit started with backfall and downwashed material grading upwards into pond deposits that filled the pit. This represents a high-resolution section equivalent in time to the initial peat-forming environment. Palynology revealed a striking difference between a fern-dominated herbaceous plant community below the pit and a pulse of washed-in fagaceous pollen (Tricolpopollenites liblarensis) at the base of the pit. This is overlain by an assemblage of woody taxa typical of a peat swamp forest associated with a number of tropical elements. Comparison with a nearby but undisturbed transition from underlying sediments to the seam confirms the ecotonal character of the parent plant of T. liblarensis, and suggests that Cupressaceae s.l., Nyssaceae and Myricaceae especially benefited from moisture and light in the clearing of the treefall pit. The transition from the underlying sediment to the lignite represents a sharp break in the sedimentary regime from clastic to purely organic material with a bounding surface colonised by large trees, most of them preserved as individual stumps, but including some fallen logs.

scholarly journals Species Identity of Large Trees Affects the Composition and the Spatial Structure of Adjacent Trees

Forests ◽  
2021 ◽  
Vol 12 (9) ◽  
pp. 1162
Author(s):  
Olga Cholewińska ◽  
Andrzej Keczyński ◽  
Barbara Kusińska ◽  
Bogdan Jaroszewicz
Keyword(s):  
Spatial Structure ◽  
Biological Diversity ◽  
Nearest Neighbor ◽  
Linear Models ◽  
Point Of View ◽  
Species Identity ◽  
Large Tree ◽  
Large Trees ◽  
Old Trees ◽  
Temperate Forest Ecosystem

Large trees are keystone structures for the functioning and maintenance of the biological diversity of wooded landscapes. Thus, we need a better understanding of large-tree–other-tree interactions and their effects on the diversity and spatial structure of the surrounding trees. We studied these interactions in the core of the Białowieża Primeval Forest—Europe’s best-preserved temperate forest ecosystem, characterized by high abundance of ancient trees. We measured diameter and bark thickness of the monumental trees of Acer platanoides L., Carpinus betulus L., Picea abies (L.) H. Karst, Quercus robur L., and Tilia cordata Mill., as well as the diameter and distance to the monumental tree of five nearest neighbor trees. The effects of the monumental tree on arrangements of the surrounding trees were studied with the help of linear models. We revealed that the species identity of a large tree had, in the case of C. betulus and T. cordata, a significant impact on the diversity of adjacent tree groupings, their distance to the central tree, and frequency of the neighboring trees. The distance between the neighbor and the large trees increased with the increasing diameter of the central tree. Our findings reinforce the call for the protection of large old trees, regardless of their species and where they grow from the geographical or ecosystem point of view.

scholarly journals Improving the efficiency of conveyor transport with the use of network technologies

2019 ◽  
Vol 140 ◽  
pp. 04011
Author(s):  
Margarita Kovalchuk ◽  
Dmitriy Poddubniy
Keyword(s):  
Optimal Solution ◽  
Motor Vehicles ◽  
Automation System ◽  
Economic Costs ◽  
The World ◽  
Large Length ◽  
Open Cast Mine ◽  
World Industry ◽  
Network Technologies ◽  
Open Cast

Nowadays there is a tendency in the world industry to increase the number of open cast mines and the depth of work performed in them. In this regard, the problems of reliable and environmentally friendly transportation of extracted resources become especially urgent. Traditional motor vehicles is quite expensive, have problems with reliability and leads to a large gas pollution of the atmosphere, as well as the associated necessary stoppages of the open cast mine, which in turn leads to significant economic costs. The most optimal solution to these problems is the use of long conveyor lines for transportation. However, it is necessary to solve a number of problems one of them is related to the efficiency of the conveyor, which has a large length. This system needs to be controlled and monitored in real time. Thus, it is necessary to implement an automation system that meets all the specified requirements.

Sedimentology of the Early Jurassic terrestrial Steierdorf Formation in Anina, Colonia Cehă Quarry, South Carpathians, Romania

2013 ◽  
Vol 63 (2) ◽  
pp. 175-199 ◽  
Author(s):  
Artur Kędzior ◽  
Mihai E. Popa
Keyword(s):  
Source Area ◽  
Sedimentary Facies ◽  
Early Jurassic ◽  
Alluvial Fans ◽  
Upward Trend ◽  
Meandering River ◽  
Facies Associations ◽  
Depositional Systems ◽  
Open Cast Mine ◽  
Open Cast

Abstract Kędzior, A. and Popa, E.M. 2013. Sedimentology of the Early Jurassic terrestrial Steierdorf Formation in Anina, Colonia Cehă Quarry, South Carpathians, Romania. Acta Geologica Polonica, 63 (2), 175-199. Warszawa. The continental, coal bearing Steierdorf Formation, Hettangian - Sinemurian in age, is included in the Mesozoic cover of the Reşiţa Basin, Getic Nappe, South Carpathians, Romania. The Steierdorf Formation can be studied in Anina, a coal mining center and an exceptional locality for Early Jurassic flora and fauna, occurring in the middle of the Reşiţa Basin. This paper presents the results of sedimentological, stratigraphical and paleobotanical researches undertaken in Colonia Cehă open cast mine in Anina, where the Steierdorf Formation outcrops widely. Several sedimentary facies associations have been described, these associations permitting the reconstruction of various depositional systems such as alluvial fans, braided and meandering river systems, as well as lacustrine and coal generating marsh systems of the Steierdorf Formation. The sedimentary associations recorded within the Steierdorf Formation show a gradual fining upward trend, pointing to a rising marine water table and a decreasing relief within the source area.

scholarly journals Resident and cavity-nesting avian community is affected by amount but not age of white pine in central Ontario mature mixedwood forests

2016 ◽  
Vol 46 (5) ◽  
pp. 725-737 ◽  
Author(s):  
Ian D. Thompson ◽  
Philip Wiebe ◽  
David A. Kirk
Keyword(s):  
Bird Species ◽  
Stand Age ◽  
Mixedwood Forests ◽  
Large Tree ◽  
Cavity Nesters ◽  
Cavity Nesting ◽  
Large Trees ◽  
Species Abundances ◽  
Pine Stands ◽  
Selection Harvesting

Forests with old-growth white pines have been severely reduced compared with historical levels. We examined resident and cavity-nesting bird species abundances in winter and the breeding season, because some of these species may prefer old-forest habitats for breeding. We counted birds over 10 years in four mixedwood types: old pine, mature pine, mature nonpine, and selection-harvested stands. We expected that old pine stands would be selected by some species because of abundant snags and large trees for foraging. We assessed habitat use among years and changes following harvesting. Counts of nomadic species varied across years but counts for others did not. Species used old and mature pine mixedwoods equally and more than nonpine or harvested stands in winter and for breeding, but old stands were not preferred. Important variables included percent pine and large tree density. Selection harvesting benefitted Yellow-bellied Sapsuckers but reduced counts of Black-capped Chickadees and Brown Creepers. Black-capped Chickadees changed habitats between seasons and in some years. Black-backed Woodpeckers were most common in pine stands but abundant in harvested stands for 2 years following cutting. Regardless of stand age, large (>40 cm) pines provide important habitat for residents and cavity nesters.

Sign in / Sign up

Export Citation Format

Share Document