scholarly journals Floristic Response of Herbaceous Flora to Intensive Cropping Systems: A Case of Ajibode-sasa Arable Agroecosystem, Ibadan, Southwest Nigeria

2020 ◽  
pp. 25-37
Author(s):  
Olayanju, Folasayo Micheal ◽  
Olubode, Oluseun Sunday
Keyword(s):  
Land Use ◽  
Invasive Species ◽  
Agricultural Landscape ◽  
Land Use Changes ◽  
Google Earth ◽  
Ecosystem Dynamics ◽  
Natural Ecosystem ◽  
Cumulative Number ◽  
Tridax Procumbens ◽  
Arable Farming

Agriculture a most significant land use types which alter natural ecosystem dynamics. Arable farming exerts much pressure on plant biodiversity, especially when practiced intensively in urban centers. There is dearth of information on floristic changes due to intensive arable farming in urban agroecosystems in developing countries. The study therefore assessed floristic changes resulting from and intensive farming practices at Ajibode-Sasa agricultural landscape. Ajibode-Sasa agroecosystem is a complex mix of arable cropping system between latitude N07°28′, E003°53′ and longitude N07°28′, E003°54. Comparative floristic surveys were conducted in 2016 and 2020 using quadrats (1 m2) systematically laid on 18 Transects ranging from 50 – 250 m long. A total of 224 and 184 quadrats were laid in 2016 and 2020 respectively. Reduction in numbers of quadrats laid resulted from physical anthropogenic development after the 2016 survey. Species identification followed standard procedures, and quantitative occurrence data were collected for determination of species composition and computation of relative importance values (RIV) and diversity indices. Land-use changes over four years period was determined using Google earth and QGIS. Herbacous plant composition with 123 cumulative number of species in both years reduced from 98 species in 2016 to 85 species in 2020 species RIV of species ranged from 0.038 – 14.803. Tridax procumbens had the highest RIV (14.803) in 2016, while it was Acmella brachyglossa (13.248) 2020. Species richness and floral diversity was high with Shannon-Weiner Index (3.081 and 3.088) and Dominance (0.09388 and 0.08746) in 2016 and 2020 respectively. Intensive cultivation favoured introduction and spread of invasive species like Tridax procumbens and Tithonia diversifolia. Eight introduced and invasive species were newly enumerated in 2020, with a total of 38 herbaceous species no longer encountered in 2020. Concerted efforts should be made to conserve native flora on the agroecosystem through sustainable practices like crop rotation and short fallow.

scholarly journals Mapping of Major Land-Use Changes in the Kolleru Lake Freshwater Ecosystem by Using Landsat Satellite Images in Google Earth Engine

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2493 ◽  
Author(s):  
Meena Kumari Kolli ◽  
Christian Opp ◽  
Daniel Karthe ◽  
Michael Groll
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Land Use Changes ◽  
Google Earth ◽  
Nutrient Concentrations ◽  
Freshwater Ecosystem ◽  
Lake Ecosystem ◽  
Lake Basin ◽  
Lake Area ◽  
Google Earth Engine

India’s largest freshwater ecosystem of the Kolleru Lake has experienced severe threats by land-use changes, including the construction of illegal fishponds around the lake area over the past five decades. Despite efforts to protect and restore the lake and its riparian zones, environmental pressures have increased over time. The present study provides a synthesis of human activities through major land-use changes around Kolleru Lake both before and after restoration measures. For this purpose, archives of all Landsat imageries from the last three decades were used to detect land cover changes. Using the Google Earth Engine cloud platform, three different land-use scenarios were classified for the year before restoration (1999), for 2008 immediately after the restoration, and for 2018, i.e., the current situation of the lake one decade afterward. Additionally, the NDVI (Normalized Difference Vegetation Index) and NDWI (Normalized Difference Water Index) indices were used to identify land cover dynamics. The results show that the restoration was successful; consequently, after a decade, the lake was transformed into the previous state of restoration (i.e., 1999 situation). In 1999, 29.7% of the Kolleru Lake ecosystem was occupied by fishponds, and, after a decade of sustainable restoration, 27.7% of the area was fishponds, almost reaching the extent of the 1999 situation. On the one hand, aquaculture is one of the most promising sources of income, but there is also limited awareness of its negative environmental impacts among local residents. On the other hand, political commitment to protect the lake is weak, and integrated approaches considering all stakeholders are lacking. Nevertheless, alterations of land and water use, increasing nutrient concentrations, and sediment inputs from the lake basin have reached a level at which they threaten the biodiversity and functionality of India’s largest wetland ecosystem to the degree that immediate action is necessary to prevent irreversible degradation.

scholarly journals Analysis and Prediction of Land Use Changes Related to Invasive Species and Major Driving Forces in the State of Connecticut

Land ◽  
2016 ◽  
Vol 5 (3) ◽  
pp. 25 ◽  
Author(s):  
Wenjie Wang ◽  
Chuanrong Zhang ◽  
Jenica Allen ◽  
Weidong Li ◽  
Mark Boyer ◽  
...  
Keyword(s):  
Land Use ◽  
Invasive Species ◽  
Driving Forces ◽  
Land Use Changes ◽  
The State

scholarly journals On farm survival of Apulian legume and cereal landraces in relation to land cover/land use changes. A case study

2021 ◽  
Author(s):  
Angela Rosa Piergiovanni ◽  
Benedetta Margiotta
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Agricultural Landscape ◽  
Land Use Changes ◽  
Natural Environments ◽  
Gis Technology ◽  
Positive Role ◽  
Cereal Species ◽  
On Farm ◽  
Collection Sites

Apulia (southeast of Italy) has always been an agricultural region in the Italian landscape. Nowadays, the countryside is a mix of natural environments and artificial landscapes. From 2014 to 2016, the region has been the object of a project aimed to collect information about geographic position and surface devoted to legume and/or cereal landrace cultivation. The collection missions carried out allowed the acquisition of 352 samples belonging to eight legumes and six cereal species. Chickpeas predominated among legumes, while durum and common wheat landraces prevailed among cereals. The cultivation of these landraces was mainly located in the marginal areas of central and southern Apulia region. The GIS technology, used in order to geo-reference the collection sites, allowed investigating the changes in land cover/land use (LCLU) occurred over the last three decades at each collecting site. In addition to the evidences collected at field level, the comparison of old ortho-photos and recent satellite images, available on Copernicus Land Monitoring Service of European Environment Agency, shown that very limited changes of LCLU have occurred. Near the collection sites, the agrarian landscape is remained highly fragmented as it was three decades ago. The cultivation side by side of irregular patches with legumes, cereals, olive trees, and grapevine characterize the agricultural landscape. Based on these evidences it can be infer that the absence of significant changes in LCLU has play a positive role in the safeguard of on farm conservation of Apulian landraces.

scholarly journals Impacts of Windfarm Development Activities on Rocky Plateaus - Discussions on Chalkewadi plateau, Dist. Satara, Maharashtra

2015 ◽  
Vol 28 (1) ◽  
Author(s):  
Manasi Karandikar ◽  
Ketaki Ghate ◽  
Ketaki Kulkarni
Keyword(s):  
Land Use ◽  
Wind Farm ◽  
Management Practices ◽  
Land Use Changes ◽  
Wind Farms ◽  
Ground Level ◽  
Google Earth ◽  
Habitat Destruction ◽  
Major Activity ◽  
Reserve Forest

Rocky plateaus are ecologically very important as they harbor special diversity and are part of catchments of major rivers of Maharashtra. Detailed studies on the components and fragility of rocky plateau ecosystems are sparse. Recently, the instances of these plateaus being subjected to various land use changes without detailed assessments, have affected the balance of the complex ecosystem and the services offered by them. Windfarm development is one major activity on the rocky plateaus for which little data is available on ecosystem level impacts. Results of the present study describe the Chalkewadi plateau complex, Satara district and impacts on the plateau surface brought about by the development of a high-density windfarm. Broad observations were made on the changing land use, microhabitats and associated vegetation. Manual analysis of Google Earth images of the plateau was done to understand the nature and scale of the ground-level disturbance. Results show that even though the actual area under windmill establishment is relatively smaller compared to the total plateau area, its environmental footprint is relatively large. The network of temporary and permanent roads, created to erect and operate the windfarm, has dissected the habitat and corridors of wildlife movement. An increase in road kill incidences was observed. Roads have also initiated erosional features all along the plateau surface. Disturbance due to windfarms is widespread on the plateau with the only exception being in the Reserve Forest area and disconnected smaller plateaus. Our results complement conclusions from other studies regarding negative impacts of windfarms on birds and reptiles. Thus overall impact of windfarms, in terms of habitat destruction is significant and should be studied in depth before establishment of wind farms. Establishment of windfarms on ecologically sensitive areas should be avoided as far as possible. However, we recommend good ecological management practices that could reduce the impacts, if wind farm establishment is inevitable. The recommendations can be applied to other plateaus in Sahyadri where windfarms are already in place

Inventory and preliminary assessment of natural hazards in Kigezi highlands, South Western Uganda

2021 ◽  
Author(s):  
Violet Kanyiginya ◽  
Ronald Twongyirwe ◽  
Grace Kagoro ◽  
David Mubiru ◽  
Matthieu Kervyn ◽  
...  
Keyword(s):  
Land Use ◽  
Natural Hazards ◽  
Natural Hazard ◽  
Rainfall Variability ◽  
Land Use Changes ◽  
Satellite Image ◽  
Google Earth ◽  
Landscape Characteristics ◽  
Western Uganda ◽  
The Impact

<p>Uganda is regularly affected by multiple natural hazards, including floods, droughts, earthquakes, landslides and windstorms. This is due to a combination of natural biophysical factors such as steep topography, intense rainfall, variability of dry and rain seasons and high weathering rates. In addition, high population density, deforestation and other human-induced land use changes, and high poverty levels are believed to have an influence on the patterns of natural hazards and their impacts in the region. Despite this, there are limited studies that assess where and when natural hazards occur in Uganda, and a dearth of information on the processes involved. In addition, drivers and earth/landscape characteristics controlling the occurrence of natural hazards in the country remain poorly understood despite the high need for effective disaster risk reduction. Here, we present the ongoing methodological research framework and the first results of a study whose main objective is to understand the spatial and temporal occurrence of natural hazards that affect the Kigezi Highlands of south western Uganda and their interactions. To this end, the study is undertaking a comprehensive regional hazard inventory consisting of satellite image analysis, field surveys and exploration of literature and archives. Historical aerial photos and interviews with the elderly are important tools to analyze the impact of multi-decadal human-induced land use changes on natural hazard occurrences. Meanwhile, a network of 15 geo-observers, i.e. citizens of local communities distributed across representative landscapes of the study area, was established in December 2019. Trained at using smartphone technology, they collect information (processes and impacts) on seven different natural hazards (droughts, earthquakes, floods, hailstorms, landslides, lightning, and windstorms) whenever they occur.  During the first 12 months, 204 natural hazard events with accurate timing information have been reported by the geo-observers. Combined to field survey, these recent events have been associated mainly with the occurrence of > 3000 shallow landslides and 30 floods, frequently in co-occurrence and triggered by heavy rainfall. Additional inventory from Google Earth and Planet imagery covering a region much larger than that of the geo-observer network and a time window of more than 10 years shows an extra 230 landslide and flood occurrences, while archives and literature indicate 226 natural hazard events over the last 30 years. The preliminary results already demonstrate the value of citizen-science in producing highly detailed natural hazard inventory. A combination of different inventory methods improves the level of accuracy in understanding the spatial-temporal distribution of natural hazards.</p>

scholarly journals Exploring the Drivers of Sentinel-2-Derived Crop Phenology: The Joint Role of Climate, Soil, and Land Use

Land ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 656
Author(s):  
Sofia Bajocco ◽  
Silvia Vanino ◽  
Marco Bascietto ◽  
Rosario Napoli
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Soil Texture ◽  
Agricultural Landscape ◽  
Land Use Changes ◽  
Summer Drought ◽  
Crop Phenology ◽  
Irrigated Crops ◽  
The Impact

The exploration of crop seasonality across a region offers a way to help understand the phenological spatial patterns of complex landscapes, like agricultural ones. Knowing the role of environmental factors in influencing crop phenology patterns and processes is a key aspect for understanding the impact of climate and land use changes on agricultural landscape dynamics. We identified pixels with similar phenological behavior (i.e., pheno-clusters) and compared them to the land cover map of the study area to assess the role of the land management component in controlling the phenological patterns identified. Results demonstrated that soil texture is the most important factor for permanent crops, while large amount of rainfall and high values of available water content are the main drivers in spring cultivations (i.e., irrigated crops). Scarce water availability (in terms of soil texture, low annual precipitation and high minimum temperature) represented the main driving factor for non-irrigated crops, whose phenology is characterized by summer drought and fall-winter productivity. Compared to vegetation maps that use only land cover from a single season or period, using seasonality of the NDVI time series to classify the agricultural landscape provides different and more ecologically relevant information about croplands.

scholarly journals Hubungan Alih Fungsi Lahan dan Perubahan Iklim terhadap Hasil Komoditas Pertanian di Jumantono

2018 ◽  
Vol 2 (1) ◽  
pp. 28
Author(s):  
Ayu Prilyscia ◽  
Sutarno Sutarno ◽  
Rahayu Rahayu
Keyword(s):  
Land Use ◽  
Image Analysis ◽  
Statistical Analysis ◽  
Climate Changes ◽  
Land Use Changes ◽  
Agricultural Productivity ◽  
Google Earth ◽  
Land Productivity ◽  
Land Use Conversion

<p>Land use conversion is a phenomenon of land use changes. The changes of land use and climate will affect on agricultural productivity. The purpose of this study was to analyze the changes of land use and climate that occurred in Jumantono District and the correlation between the land use conversion and the climate changes to agricultural productivity. This research was conducted in Jumantono District and Laboratory of Pedoogy and Climatology in Agriculture Faculty. Data be analyzed quantitavie descriptively and by correlation. The results showed that there was a change of land use area according to BPS in 2006-2007 and according to Google Earth Image analysis in 2004-2011 or 2011-2014 there ware changes of land use. Statistical analysis showed that land use changes and climate changes was significally correlated with land productivity.</p>

scholarly journals Land use changes of historical structures in the agricultural landscape at the local level — Hriňová case study

2013 ◽  
Vol 32 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Matej Mojses ◽  
František Petrovič
Keyword(s):  
Land Use ◽  
Agricultural Landscape ◽  
Local Level ◽  
Land Use Changes ◽  
Research Area ◽  
Agricultural Landscapes ◽  
Economic Changes ◽  
Historical Structures ◽  
Ecological Aspects ◽  
Important Trend

AbstractThe aim of this paper is to describe agricultural landscapes in the cadastral area of Hriňova and their development in the context of social and economic changes over the past 60 years. This area is characterized by the occurrence of historical structures of agricultural landscape (HSAL) which are important because they comprise various cultural, environmental and ecological aspects. The assessment of land use changes on the two scales of cadastral area and selected small localities highlights that the most important trend here is agricultural extensification. The results show that despite these changes in land use, the historical structures in the agricultural landscape represented by forms of anthropogenic relief remain a permanent part of this research area.

scholarly journals CHANGES OF LAND USE AND LAND COVER IN SMALL ISLANDS CASE STUDY: WEH-SABANG ISLAND, INDONESIA

2019 ◽  
Vol 10 (1) ◽  
pp. 48-53 ◽  
Author(s):  
Arif, A.A. ◽  
Machdar,I ◽  
Azmeri ◽  
Achmad,A
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Land Degradation ◽  
Environmental Control ◽  
Diversity Index ◽  
Land Use Changes ◽  
Coastal Areas ◽  
Google Earth ◽  
Small Island ◽  
Lulc Changes

Development will increase sporadic land use and tend to cause land degradation. This paper is intended to investigate the effects of land use and land cover processes on Weh-Sabang Island, Indonesia. The duration of LULC changes is analyzed using Google Earth images from 2008 to 2018. Through observations of satellite imagery detected protected area and green space area has been greatly reduced in area and transformed into built-in land which functions as a tourist area and urban built environment. Where as in the coastal areas the change from vacant land to land that was built has also become larger over the past ten years. The increase in land density since 2008 is due to the construction of tourist attractions in hilly areas to coastal areas around Weh-Sabang Island, and can cause changes in the morphology and typology of the city of Sabang. Through the method of calculating the Land Diversity Index, changes can be made in the number of areas that have changed in the period of the year being monitored. The coastal areas experience more land use changes than hilly areas, and through observations of LULC changes across Weh Island, it is expected that efforts will be made to control land use changes in areas that have directly experienced land degradation, and must consider environmental control efforts. As small island like that which happened on Weh-Sabang Island. The westernmost island of the Republic of Indonesia.

scholarly journals Study on land use changes, causes and impacts by remote sensing, GIS and Delphi methods in the coastal area of Ca Mau province in 30 years

2020 ◽  
Vol 61 (4) ◽  
pp. 36-45
Author(s):  
Hanh Hong Tran ◽  
Anh Van Tran ◽  
Nghi Thanh Le ◽  
Keyword(s):  
Remote Sensing ◽  
Land Use ◽  
Land Cover ◽  
Land Use Changes ◽  
Cultivated Plants ◽  
Natural Ecosystem ◽  
Residential Areas ◽  
Change Analysis ◽  
Consensus Analysis ◽  
Spatio Temporal

The main aim of this paper is to assess the spatio-temporal changes of land cover/land use, as well as their causes and impacts of the changes in Phu Tan district of Ca Mau province in 30 years from 1989 to 2018. Multi-temporal remote sensing satellite images (Landsat) were collected, and classified using supervised method. After validation and post classification, they are mapped for analysing land use/land cover change analysis in three decades. The accuracies of the land cover/land use maps for three time intervals were all more than 80%. Delphi method consensus analysis of expert opinion was applied in 2 rounds of survey with the consultancy of eight experts. Overall, the results show that over the last 30 years, the areas of cultivated plants and water bodies significantly decreased. In contrast, aquaculture ponds, mangrove forest, and residential areas substantially increased. These changes are driven by polical, demographic, socioeconomic and environmental factors. The major impacts include water quality, bussiness and service, and natural ecosystem. The results of this study will contribute to providing a panoramic view of the design of economic, social and environmental policies to ensure sustainable development at the district level.

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