Analysis of Landsat-derived multitemporal vegetation cover to understand drivers of oasis agroecosystems change

Lamqadem, Atman Ait; Afrasinei, Gabriela Mihaela; Saber, Hafid

doi:10.1117/1.jrs.13.014517

Cited by 18 publications

(11 citation statements)

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“…Concerns over the potential impacts of those anthropogenic activities on vegetation dynamics (vegetation distributions and its compositions) have increased in recent decades. Thus, assessment of vegetation dynamics in arid areas are emerging as a research focus worldwide [10][11][12]. Cao et al reported that responses of the 10-day normalized difference vegetation index (NDVI) to temperature were more significant than that to precipitation in Xinjiang, while the decrease in the annual precipitation was the main factor that led to the fluctuations of the vegetation coverage [13].…”

Section: Introductionmentioning

confidence: 99%

Assessing Vegetation Dynamics and Landscape Ecological Risk on the Mainstream of Tarim River, China

Hui

Xue

Wei³

et al. 2020

Water

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The Tarim River (TR), the longest inland river at an arid area in China, plays a critical role in the sustainable development of the regional ecological environment. This study presents the spatial-temporal variations in the vegetation coverage at regional and pixel scales and its driving factors on the TR mainstream. The latest dataset of normalized difference vegetation index (NDVI) and a vegetation coverage index (fc) over the period from 2000–2015 were analyzed with the unary linear regression and the partial correlation. On the basis of land use data, we further built the landscape ecological risk index and assessed the ecological risk level of the mainstream. Our results suggest that the vegetation coverage index demonstrated fluctuations but denoted a generally upward trend in the TR mainstream, the vegetation improvement areas are far greater than the degraded areas during the study period. Apparently, the overflow days in the TR mainstream and the cumulative amount of water transport are the two main factors that dominate the vegetation coverage. The ecological risk level varies throughout the TR with a high-to-low spatial distribution from upstream to downstream, and the overall landscape ecological risk of the whole basin exhibits an upward tendency. Above all, our study provides a framework with the remote sensing data to assess vegetation coverage and landscape ecological risk which can help design and implement reliable strategies for the ecological management and vegetation restoration in the Tarim River Basin.

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Section: Introductionmentioning

confidence: 99%

Assessing Vegetation Dynamics and Landscape Ecological Risk on the Mainstream of Tarim River, China

Hui

Xue

Wei³

et al. 2020

Water

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“…These factors are relatively stable and have cumulative effects on productive and ecological land. In contrast, anthropogenic factors, such as population density, economic growth, and transportation, are relatively active and play a decisive role in the formation of shortterm land use patterns, such as for living land (hang et al, 2017;Lamqadem et al, 2019). Fluctuations in meteorological factors affect the spatial and temporal patterns of various types of land.…”

Section: Future Land Use Simulation On the Nstmmentioning

confidence: 99%

Spatial and temporal changes in land and water resources on the northern slopes of the Tianshan mountains from the perspective of “production-living-ecological space”

Tian²,

Yang³

et al. 2023

Front. Environ. Sci.

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The rapidly growing social demand for water and land, along with increasingly constraining economic and social development, have intensified the conflicts between regional production, living, and ecological spaces (PLES). Water and land resources have become major obstacles to long-term growth in arid and semi-arid regions. Therefore, we propose a scenario-based framework for a production, living, and ecological spaces water resource assessment, integrating patch-generating land use simulation (PLUS), Shared Socioeconomic Pathways (SSPs), and multiple regression equations to analye the spatial and temporal variability of these resources on the northern slopes of the Tianshan Mountains (NSTM) and assess the future development of water resources. The results show: 1) from 2000 to 2020, land use types on the northern slopes of the Tianshan Mountains were dominated by ecological land, which decreased to 11,793 km2; production and domestic land use increased. Water for production and ecological use accounted for approximately 93% and a minor proportion of the total water use, respectively. 2) Production land is mainly influenced by population density and Gross Domestic Product (GDP), living land by population density, and ecological land by precipitation and topographic factors. 3) The PLUS model had good applicability, with a kappa coefficient, overall accuracy, and FoM of 0.81, 0.88, and 0.28, respectively. 4) The total water use in the northern slopes of the Tianshan Mountains will increase under all three scenarios between 2030 and 2050, but by varying degrees. Production water use accounts for the most significant proportion (93%), with its use decreasing by 305 million m3 under the SSP3 scenario. Domestic water use shows a slow increase under all three scenarios. Further development of the northern slopes of the Tianshan Mountains should take account of regional ecological vulnerability, and water use for production should be controlled based on existing water resources and ecological capacity to reduce pressure on the environment and provide essential ecological protection and sustainable development.

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“…Other less reported threats include climate change (Jeder et al 2021) and the spread of recently introduced water-consuming crops such as watermelon (Lamqadem et al 2019), that can affect the sustainability of the oases in the long term. According to Peano et al (2021) also the increasing property fragmentation due to traditional inheritance system can represent a vulnerability, as the new generation of farmers inherit very small plots not adequate for a sufficient agricultural production and for sufficient incomes; in this regard, the application of a participatory approach, the institution of custodian farmers and of a "maison de semences", can encourage the involvement of young farmers and contribute to the effective preservation of local agrobiodiversity.…”

Section: Main Vulnerabilities In Traditional Oasesmentioning

confidence: 99%

Traditional oases in Northern Africa as multifunctional agroforestry systems: a systematic literature review of the provided Ecosystem Services and of the main vulnerabilities

Santoro

2022

Agroforest Syst

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Traditional oases represent unique forms of adaptation to extreme environmental conditions, developed through the centuries by local farmers to support their livelihood, combining different crops (date palms, fruit trees, vegetables and fodder) with livestock breeding. Despite their social, economic and cultural importance, these agroforestry systems are currently facing multiple socio-environmental threats. The aim of the paper is to investigate the variety of Ecosystem Services (ES) and the main threats related to traditional oases in Northern Africa through a systematic literature review. The search returned 257 relevant papers published from 2005 to March 2022, mostly focusing on Tunisian oases (37%), followed by Algerian (23%), Moroccan (19%), Egyptian (17%), and Libyan (4%). Provisioning Services, in particular Genetic diversity, agrobiodiversity and biodiversity, are the most cited ES (36% of the papers) followed by Cultural Services, mainly represented by Traditional knowledge systems, cultural heritage and sense of place (17%), while Regulating Services are less considered. Results highlighted that water related issues (desertification, drought, salinization or overexploitation) represent the main threat, followed by decrease of agrobiodiversity, primarily due to the spread of monocultures of commercial date varieties, and by social transformations (depopulation, traditional knowledge and cultural heritage loss). The literature review proved that traditional oases are still crucial for the livelihood of local communities since they still provide many ES. Local experiences related to sustainable development and tourism, or innovative solutions to valorize local products and byproducts, could be important for replication in other traditional oases to contribute to the wellbeing of local communities and to the preservation of these agroecosystems.

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Analysis of Landsat-derived multitemporal vegetation cover to understand drivers of oasis agroecosystems change

Cited by 18 publications

References 0 publications

Assessing Vegetation Dynamics and Landscape Ecological Risk on the Mainstream of Tarim River, China

Assessing Vegetation Dynamics and Landscape Ecological Risk on the Mainstream of Tarim River, China

Spatial and temporal changes in land and water resources on the northern slopes of the Tianshan mountains from the perspective of “production-living-ecological space”

Traditional oases in Northern Africa as multifunctional agroforestry systems: a systematic literature review of the provided Ecosystem Services and of the main vulnerabilities

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