The paleolimnology of a small waterbody in the Pocono Mountains of Pennsylvania, USA: reconstructing 19th?20th century specific conductivity trends in relation to changing land use

1994 ◽  
Vol 12 (2) ◽  
pp. 75-86 ◽  
Author(s):  
Anne-Marie Lott ◽  
Peter A. Siver ◽  
Laurence J. Marsicano ◽  
Kenneth P. Kodama ◽  
Robert E. Moeller
Keyword(s):  
Land Use ◽  
20Th Century ◽  
Specific Conductivity ◽  
Pocono Mountains

scholarly journals The Landscape of the Dehesa in the Sierra Morena of Jaén (Spain) – the Transition from Traditional to New Land Uses

2015 ◽  
Vol 43 ◽  
pp. 1-15 ◽  
Author(s):  
Antonia Paniza Cabrera
Keyword(s):  
Land Use ◽  
20Th Century ◽  
Land Uses ◽  
Livestock Farming ◽  
Sierra Morena ◽  
Olive Groves

This paper tracks the evolution of the area covered by the dehesa in Sierra Morena from the mid 20th century to the present day, in an attempt to identify those areas in which traditional land uses still hold sway and others in which new land uses are appearing in relation to emerging business activities. These new uses have brought about an important transformation in the landscape of the dehesa, which in some areas is being replaced by other more profitable forms of land use, in particular with olive groves. In many areas where the dehesa still exists, livestock farming has been replaced by hunting, which has led to internal changes in the structure of the dehesa with an increase in scrubland. Another emerging land use is tourism-related activities, which many farmers now use to complement their income from livestock and which help preserve the traditional landscape of the dehesa.

scholarly journals Spatial Variation in Bacterioplankton Communities in the Pearl River, South China: Impacts of Land Use and Physicochemical Factors

2020 ◽  
Vol 8 (6) ◽  
pp. 814
Author(s):  
Lei Zhou ◽  
Weiyuan Chen ◽  
Jijia Sun ◽  
Li Liu ◽  
Xiande Huang
Keyword(s):  
Land Use ◽  
Environmental Factors ◽  
Spatial Patterns ◽  
Agricultural Land ◽  
Anthropogenic Activities ◽  
Specific Conductivity ◽  
Pearl River ◽  
Physicochemical Factors ◽  
The Pearl River ◽  
Bacterioplankton Communities

River ecosystems are critical for human and environmental health, with bacterioplankton playing a vital role in biogeochemical cycles. Unveiling the spatial patterns of bacterioplankton communities in relation to environmental factors is important for understanding the processes of microbial variation and functional maintenance. However, our understanding of the correlations among bacterioplankton communities, physicochemical factors, and land use, especially in large rivers affected by intensive anthropogenic activities, remains relatively poor. Here, we investigated the bacterioplankton communities in July 2018 in three main tributaries of the Pearl River, i.e., Beijiang, Xijiang, and Pearl River Delta, based on 16S rRNA high-throughput sequencing. Results showed that the most dominant phyla, Proteobacteria, Actinobacteria, Cyanobacteria, and Planctomycetes accounted for 33.75%, 22.15%, 11.65%, and 10.48% of the total abundance, respectively. The bacterioplankton communities showed remarkable differences among the three tributaries in terms of composition, structure, diversity, and predictive functional profiles. Mantel and partial Mantel tests revealed that the bacterioplankton communities were affected by physicochemical variables (p < 0.01) and land use (p < 0.01). Redundancy analysis identified specific conductivity, dissolved oxygen, agricultural land, ammonium, urban land, and water transparency as the dominant environmental factors influencing the bacterioplankton communities in the Pearl River. Variation partitioning analysis indicated that both physicochemical factors and land use had direct effects on the bacterioplankton community, and that land use may also shape bacterioplankton communities through indirect effects of physicochemical factors on riverine ecosystems. This study provides fundamental information on the diversity, spatial patterns, and influencing factors of bacterioplankton communities in the Pearl River, which should enhance our understanding of how such communities change in response to environmental gradients and anthropogenic activities.

Historical Land Uses and Their Changes in the European Alps

2019 ◽  
Author(s):  
Ulrike Tappeiner ◽  
Erich Tasser
Keyword(s):  
Land Use ◽  
20Th Century ◽  
Land Reclamation ◽  
Alpine Region ◽  
Ecosystem Functions ◽  
Mountain Range ◽  
European Alps ◽  
Ligurian Sea ◽  
Arable Farming ◽  
The Alps

The Alps are the highest and largest mountain range in Europe. They extend from the Ligurian Sea to the Pannonian Basin in an arc 744 miles (1,200 km) long and between 93 and 155 miles (150–250 km) wide. The settlement history of this large European landscape is closely linked to the settlement of Europe as a whole, whereby the inner Alpine region was not permanently settled until around 4500 bce because of topographical and climatic disadvantages. Dense forest cover initially made it difficult to use large grazing areas, but transhumance gradually developed in the Alpine region when the animals spent their summers high up in the mountains and their winters in the valleys. At about the same time, the Alpine self-sufficiency economy of arable farming and livestock breeding was added, which made permanent settlement possible. However, the most intensive settlement and land reclamation advance took place in the Middle Ages. In the 19th century, industrialization reached the Alpine region a little delayed, and globalization in the middle of the 20th century. This also led to a fundamental change in society. The previous agricultural society was replaced by the service society of the 20th century. Developments since the late 1950s have taken place against the background of developments in the European Union (EU) as a whole, above all the Common Agricultural Policy and the European Spatial Development Perspective (ESDP), but these developments were and still are influenced by additional agreements specific to the Alps, such as the Alpine Convention, the Alpine Protection Commission (CIPRA), and the Alpine Working Community (Arge Alp). All these factors mean that historical and current development of land use in the Alpine region has been and is always linked to developments in Europe. Many studies on land use in the Alpine region should therefore be seen in this context. Moreover, past land use often has long-lasting legacy effects on ecosystems and their development. Therefore, in this article we deal not only with historical land use but also with current and future developments and their impacts on ecosystem functions and services.

Long-term spatio-temporal dynamics of a hedgerow network landscape in Flanders, Belgium

2005 ◽  
Vol 32 (1) ◽  
pp. 20-29 ◽  
Author(s):  
B. DECKERS ◽  
E. KERSELAERS ◽  
H. GULINCK ◽  
B. MUYS ◽  
M. HERMY
Keyword(s):  
Land Use ◽  
20Th Century ◽  
Network Structure ◽  
18Th Century ◽  
Temporal Dynamics ◽  
Network Dynamics ◽  
Landscape Position ◽  
Hedgerow Networks ◽  
Insight Into

Although the importance of hedgerows for sustainable agriculture and conservation of rural biodiversity is increasingly being recognized, obtaining insight into the spatial and temporal dynamics of hedgerow networks remains an important challenge for landscape ecologists, with the key factors driving changes in rural landscape structure especially deserving further attention. The present study analyses the long-term history of a hedgerow network landscape in Flanders, Belgium. A detailed reconstruction of the hedgerow network is made at five points in time, starting at the end of the 18th century until present, for 367 distinct 400 m×400 m samples. Whilst hedgerows were mainly concentrated around historical village centres and within valleys at the end of 18th century, the network expanded progressively during the 19th century. In the 20th century, the hedgerow network degraded strongly, with hedgerow density and connectivity declining and mesh-size heterogeneity and network fragmentation increasing, although the network recovered slightly during the 1990s. Different trajectories of change in hedgerow network structure were observed depending on landscape position, with both topography and village proximity significantly affecting hedgerow network dynamics. The present network structure was mainly governed by land use, with highly developed networks being predominantly associated with pasture. Three main conclusions arise from the results of this study. First, the role of land use and landscape position as basic factors steering hedgerow network dynamics at the landscape scale is demonstrated. Second, the long-term perspective of the study enabled insight into the poorly known expansion phase of hedgerow networks, linked mainly with the development of small-scale labour-intensive agriculture. Finally, the findings confirm the large-scale degradation of linear semi-natural habitats in European agricultural landscapes during most of the 20th century, and indicate that a pro-active rural policy can halt and even reverse this process.

scholarly journals Índice de Vulnerabilidade Socioambiental na Área da Gleba “C” da Universidade Federal do Pará, no Município de Belém

2021 ◽  
Vol 14 (4) ◽  
pp. 2322-2337
Author(s):  
Maria Carolina Chaves de Sousa ◽  
Peter Mann de Toledo ◽  
Filipe Gomes Dias
Keyword(s):  
Land Use ◽  
20Th Century ◽  
Social Economic ◽  
Environmental Issues ◽  
The State ◽  
Environmental Vulnerability ◽  
The Social ◽  
Social Environmental ◽  
The Right

At the beginning of the 20th century, urbanization and occupation of privileged spaces at the expense of “lowland” spaces and close to a floodplain. The “lowlands” were occupied by a population, mostly with socioeconomic needs, forming housing groups susceptible to flooding and flooding. To bring the recognition of rights to these occupants, a land regularization work was carried out by the Federal University of Pará - UFPA, together with public entities from the State and the Union. The article aims to present and compare the degree of socio-environmental vulnerability in the area of land C of UFPA in the municipality of Belém, object of land regularization activity, applying indicators and indices related to social, economic, legal and environmental issues. The results show that the degree of vulnerability is high in the years surveyed, concluding that the legal regularization work carried out in the area was only patrimonial, in order to transfer responsibilities for land use to the beneficiary residents and the recognition of the right of that title by law. . Effective land regularization work should involve a set of bodies responsible for the social, environmental, urban and land areas so that, in a concatenated and long-term manner, the work carried out is carried out so that the results are captured by the indicators and that the data decrease the degree of socio-environmental vulnerability in the studied area.

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