scholarly journals Multitemporal Analysis of Land Use Changes and Their Effect on the Landscape of the Jerte Valley (Spain) by Remote Sensing

Agronomy ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1470
Author(s):  
Yolanda Sánchez Sánchez ◽  
Antonio Martínez Graña ◽  
Fernando Santos-Francés ◽  
Joan Leandro Reyes Ramos ◽  
Marco Criado Nicolás
Keyword(s):  
Land Use ◽  
Forest Fires ◽  
Satellite Images ◽  
Land Use Changes ◽  
Environmental Parameters ◽  
Land Uses ◽  
Environmental Disturbances ◽  
Management Measures ◽  
Landscape Quality ◽  
Landscape Units

In recent years, the interest of institutions in land use has increased, creating the need to determine the changes in use through spatial-temporal and statistical analysis. This study analyzes the changes over the last 40 years, based on a cartography of landscape units obtained from the study of geo-environmental parameters in the Jerte Valley (Spain) with satellite images, Landsat 5 and 7. Subsequently, through the analysis of spatial patterns and diversity and fragmentation indices, and with the Fragstat software, the landscape was characterized from 1994 to the present. The results show that wooded areas decreased slightly, crops increased in altitude and major environmental disturbances (mainly forest fires) negatively affected the environmental mosaic. Land uses affect the landscape by developing larger tesserae (+5 ha), which are less fragmented (−0.15), but more isolated (0.12). This study demonstrates that landscape metrics can be used to understand changes in spatial pattern, help in decision making to implement appropriate management measures in the conservation of traditional land uses, and allow the maintenance of connecting areas between fragments to avoid the loss of natural corridors to increase landscape quality.

scholarly journals Changes in Coastal Agricultural Land Use in Response to Climate Change: An Assessment Using Satellite Remote Sensing and Household Survey Data in Tien Hai District, Thai Binh Province, Vietnam

Land ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 627
Author(s):  
Duong H. Nong ◽  
An T. Ngo ◽  
Hoa P. T. Nguyen ◽  
Thuy T. Nguyen ◽  
Lan T. Nguyen ◽  
...  
Keyword(s):  
Climate Change ◽  
Land Use ◽  
Agricultural Land ◽  
Land Use Changes ◽  
Management Strategies ◽  
Household Survey ◽  
Extreme Weather Events ◽  
Agricultural Land Use ◽  
Landsat 8 ◽  
Land Uses

We analyzed the agricultural land-use changes in the coastal areas of Tien Hai district, Thai Binh province, in 2005, 2010, 2015, and 2020, using Landsat 5 and Landsat 8 data. We used the object-oriented classification method with the maximum likelihood algorithm to classify six types of land uses. The series of land-use maps we produced had an overall accuracy of more than 80%. We then conducted a spatial analysis of the 5-year land-use change using ArcGIS software. In addition, we surveyed 150 farm households using a structured questionnaire regarding the impacts of climate change on agricultural productivity and land uses, as well as farmers’ adaptation and responses. The results showed that from 2005 to 2020, cropland decreased, while aquaculture land and forest land increased. We observed that the most remarkable decreases were in the area of rice (485.58 ha), the area of perennial crops (109.7 ha), and the area of non-agricultural land (747.35 ha). The area of land used for aquaculture and forest increased by 566.88 ha and 772.60 ha, respectively. We found that the manifestations of climate change, such as extreme weather events, saltwater intrusion, drought, and floods, have had a profound impact on agricultural production and land uses in the district, especially for annual crops and aquaculture. The results provide useful information for state authorities to design land-management strategies and solutions that are economic and effective in adapting to climate change.

scholarly journals Analyzing the Patterns, Trends and Dynamics of the Land-Use Changes in Azores Region: From 1990 to 2018

2021 ◽  
Vol 13 (10) ◽  
pp. 5433
Author(s):  
Rui Alexandre Castanho ◽  
José Manuel Naranjo Gómez ◽  
Gualter Couto ◽  
Pedro Pimentel ◽  
Áurea Sousa ◽  
...  
Keyword(s):  
Land Use ◽  
Development Strategy ◽  
Land Use Changes ◽  
Regional Government ◽  
Land Uses ◽  
Comprehensive Planning ◽  
Sustainability Planning ◽  
The Enlightenment ◽  
Planning Strategies ◽  
Agricultural Areas

The remarkable richness and singularity of the Azorean Region (located 38° North) and its landscapes require a sharp, well-defined, and comprehensive planning policy. Bearing in mind the significance of this issue in the enlightenment of sustainability, planning strategies should be based and supported by different studies and thematic domains to understand the problem thoroughly. Using GIS (Geographic Information Systems), the present article enables us to identify the dynamics and patterns of the evolution of the Land-Use Changes in the Azores Region from 1990 to 2018. In aggregate, the Azores islands showed growth in artificial surfaces and forest and seminatural land-uses by essentially decreasing agricultural areas—most resulting from the economic and social development strategy pursued by several Azorean governments. Moreover, this study permits us to reinforce that the Azores Archipelago’s land-uses has undergone multiple changes—marked by increasing and decreasing periods. In fact, some of these reducing dynamics are disturbing. They require closer monitorization by regional government actors to give protection, preservation, and conservation to these incomparable ultra-peripheral landscapes, environments, ecosystems, and the region as a whole.

scholarly journals Hedgerows and Enclosures in Rural Areas: Traditional vs. Modern Land Use in Mediterranean Mountains

Land ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 57
Author(s):  
Fernando Allende Álvarez ◽  
Gillian Gómez-Mediavilla ◽  
Nieves López-Estébanez ◽  
Pedro Molina Holgado ◽  
Judith Ares Barajas
Keyword(s):  
Land Use ◽  
Rural Areas ◽  
Land Use Changes ◽  
Economic Benefits ◽  
Main Role ◽  
Land Uses ◽  
Social Ecological ◽  
The Social ◽  
Mediterranean Mountains ◽  
Agroforestry Practices

The present paper highlights the importance of hedgerows and enclosures in the mountains of Central Spain. Now, these landscapes have suffered profound variations in terms of agroforestry practices, especially in the Mediterranean mountains where the characteristic multifunctional has largely been lost. The article analyzes land uses changes, dynamics, and their morphological features between the first half of the 20th Century (1956) and the second decade of the present time (2019). The paper was divided into three sections. First, the identification of land uses using orthophotograph and aerial photograph; after that the info was checked with fieldwork. Eleven categories were identified according to the dominant use and land use changes and size of land parcels were taken into consideration. Second, the configuration and the information collected through the type and intensity of change in land uses made it possible to recognise and quantify their distribution and trend between these two dates. Also, the kernel density algorithm available in the Arcgis 10.5 software was used to obtain density and changes in land parcels. Finally, an overview is given of the main role that this agroforestry plays due to the social, ecological, and economic benefits that they provide for allowing sustainable development.

scholarly journals Landscape Ecological Structure in the Eastern Part of the North Vidzeme Biosphere Reserve, Latvia

2008 ◽  
Vol 62 (1-2) ◽  
pp. 63-70
Author(s):  
Aivars Tērauds ◽  
Oļgerts Nikodemus ◽  
Inga Rasa ◽  
Simons Bells
Keyword(s):  
Land Use ◽  
Landscape Structure ◽  
Land Use Changes ◽  
Biosphere Reserve ◽  
Forest Area ◽  
Forest Patches ◽  
Ecological Structure ◽  
The North ◽  
Landscape Units ◽  
Landscape Ecological

Landscape Ecological Structure in the Eastern Part of the North Vidzeme Biosphere Reserve, Latvia Latvia is a country where the forest area has increased and habitat fragmentation has reversed compared with many other European countries. In order to examine the effect of this expansion on biodiversity, vegetation maps dating from 2002 and the years 1930-1936 were used for comparative landscape structure analyses while archive materials from forest plans, and data from the national forest management database were used for land use analysis. Four landscape ecoregions in the eastern side of the North Vidzeme Biosphere Reserve were selected for analysis. Landscape structure indicators derived from landscape ecology were used for the ecological assessment of land use changes. The total number of forest patches had decreased over the study period, but mean patch size had increased for all types of landscape element. This general change was found to vary between different landscape units in the study area. The biggest change in the area of forest patches occurred in the Rūjiena drumlin field, where the amount of forest patches decreased least and forest area increased the most. This study showed that the internal structure of the forest matrix changed substantially. This finding has implications for biodiversity protection if this trend of land use change continues.

Perception of Local People on Land Use Change

2021 ◽  
pp. 65-87
Author(s):  
H. M. Paba Herath ◽  
K. W. G. Rekha Nianthi
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Forest Fires ◽  
Catchment Area ◽  
Land Use Changes ◽  
Community Based ◽  
Long Period ◽  
Legal Frameworks ◽  
Effects Of Land Use ◽  
People’S Perceptions

The land use of the Belihuloya catchment area in Sri Lanka has been changing over a long period mainly due to the human activities. The study was aimed to find out the spatial and temporal changes of land use in the Belihuloya Mini Catchment area of 1956 to 2015, and obtain the local people's perception of the effects of land-use changes in Belihuloya. To study the people's perceptions of land use change, a questionnaire survey was conducted among randomly selected 180 households. Aerial data of 1956 and satellite data of 2015 were used to analyze the land use changes. The vegetation cover maps of 1956 and 2015, demonstrated the drastic changes of land use in Belihuloya. More than 50% of the respondents in the study area perceived that the land use has been changing due to the construction activities, forest fires, illegal loggings, pine and tea cultivation and the expansion of built-up areas. The deforestation has badly effected on water resources in the Belihuloya. The reforestation programs, including community-based reforestation programs can be introduced to minimize the impacts. It is necessary to implement existing legal frameworks with supports of different stakeholders to conserve the Belihuloya.

scholarly journals Land–Use Changes Influencing C Sequestration and Quality in Topsoil and Subsoil

Agronomy ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 520 ◽  
Author(s):  
Benjapon Kunlanit ◽  
Somchai Butnan ◽  
Patma Vityakon
Keyword(s):  
Land Use ◽  
Humic Acid ◽  
Humic Acids ◽  
Soil Depth ◽  
Land Use Changes ◽  
Rice Paddy ◽  
C Sequestration ◽  
Land Uses ◽  
Intergovernmental Panel ◽  
Soc Stocks

Soil capacity as a major carbon (C) sink is influenced by land use. Estimates of soil organic carbon (SOC) sequestration have mostly focused on topsoils [0–30 cm official Intergovernmental Panel on Climate Change (IPCC) soil depth]. We investigated SOC stocks and their quality as influenced by land-use changes. Soil samples were collected from five soil depths down to 100 cm of three adjacent fields each representing a different land use—forest, cassava, and rice paddy—in Northeast Thailand. Sequestration of SOC in topsoils under all land uses was higher, as indicated by SOC stocks (59.0–82.0 Mg ha−1) than subsoils (30–100 cm) (27.0–33.0 Mg ha−1). The soil profile (0–100 cm) of the forest had higher stocks of SOC and humic acid (115.0 and 6.8 Mg ha−1, respectively) than those of cultivated land uses [paddy (100.0 and 4.8 Mg ha−1, respectively) and cassava (87.0 and 2.3 Mg ha−1, respectively)], which accounted for an average 30% increase in SOC sequestration over those with only topsoil. Topsoils of the forest had higher humic acid content but narrower E4:E6 ratio [the ratio of absorbances at 465 nm (E4) and at 665 nm (E6)] of humic acids (2.8), indicating a higher degree of humification and stabilization than the cultivated soils (3.2–3.6). Subsoil C was higher quality, as indicated by the lower E4:E6 ratio of humic acids than topsoils in all land uses.

scholarly journals Estimation of land-use changes on Kitulo Plateau, Tanzania, using satellite imagery

Oryx ◽  
1994 ◽  
Vol 28 (3) ◽  
pp. 173-182
Author(s):  
Jon C. Lovett ◽  
Erik Prins
Keyword(s):  
Land Use ◽  
Satellite Imagery ◽  
Vascular Plants ◽  
Satellite Images ◽  
Nature Reserve ◽  
Land Use Changes ◽  
Bare Soil ◽  
Digital Analysis ◽  
Threatened Plants ◽  
Strong Case

The Kitulo Plateau of southern Tanzania is a lava plateau covering 273 sq km at an altitude of over 2500 m. The vegetation is predominately grassland with more than 350 taxa of vascular plants, of which nearly 5 per cent are of restricted distribution. Although the plateau is extensive, much of it is now cultivated. Digital analysis of satellite images showed that at least 24 per cent of the plateau was bare soil, modified grassland or cultivation between 1973 and 1989. The botanical importance of the plateau and increase in cultivation make a strong case for the establishment of a nature reserve to protect its rare and threatened plants.

scholarly journals Carbon stocks and dynamics of different land uses on the Cerrado agricultural frontier

PLoS ONE ◽  
2020 ◽  
Vol 15 (11) ◽  
pp. e0241637
Author(s):  
Emily Ane Dionizio ◽  
Fernando Martins Pimenta ◽  
Lucas Barbosa Lima ◽  
Marcos Heil Costa
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Sustainable Agriculture ◽  
Soil Carbon ◽  
Land Use Changes ◽  
Carbon Stocks ◽  
Land Uses ◽  
Rainfed Agriculture ◽  
Agricultural Frontier ◽  
Soil Carbon Stocks

The largest and most dynamic agricultural frontier in Brazil is known as MATOPIBA, an area that covers part of the Cerrado biome. Within this region, Western Bahia stands out as a large producer of soy and cotton. There are no studies that quantify carbon stocks for different land uses and land cover types in Western Bahia, which hinders comprehension of the role of agricultural expansion in carbon dynamics and the development of sustainable agriculture policies. Here, we evaluate how the land use changes in this region have affected the carbon balance in the aboveground biomass (AGB), belowground biomass (BGB), and soil reservoirs. We collected soil samples for areas with different land uses and land cover types to estimate soil carbon stocks (SCS) and combined remote sensing results and modeling techniques to develop a historical reconstruction of spatial patterns of SCS, AGB, and BGB during the period 1990–2018. The replacement of areas from the forest formations class with pasture and rainfed agriculture reduced the 100 cm depth SCS (SCS100) by 37.3% (p = 0.031) and 30.3% (p = 0.053), respectively. By contrast, the conversion of pasture and rainfed agriculture to irrigated agriculture increased SCS100 by 34% (p = 0.034) and 26.5% (p = 0.022), respectively. Spatial changes in historical carbon stocks are strongly associated with land use changes that occurred between 1990 and 2018. We estimated a non-significant loss of 61.9 Tg-C (p = 0.726) from the total carbon stocks (calculated as the sum of AGB, BGB, and SCS) of which 80% of the losses came from soil stocks, 11% from BGB, and 8% from AGB. These findings reveal the need to monitor carbon stocks in sandy soils to reduce the uncertainties of estimates and support the development of effective sustainable agriculture policies. The best alternatives for reducing carbon losses in the Cerrado are to maintain natural forest cover and to recover soils through sustainable soil management, especially in pasturelands where soil carbon stocks are lowest.

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