Arid land monitoring using Landsat albedo difference images

Robinove, Charles J.; Chavez, Pat S.; Gehring, Dale G.; Holmgren, Ralph C.

doi:10.1016/0034-4257(81)90014-6

Cited by 146 publications

(44 citation statements)

References 2 publications

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“…insects) and the increase of mycorrhiza (symbiotic association between plant tissues with fungi) would be the compensation for reducing endemic fauna (Pagano, Zandavalli, & Araújo, 2013). Other important factor, in areas that tree individuals have low aerial biomass and high underground biomass, the albedo is still low, in other words, there is a high light absorption in the system, because the soil with high organic matter absorbs more light than soil with low organic matter (Robinove, Chavez Jr., Gehring, & Holmgren, 1981 …”

Section: Discussionmentioning

confidence: 99%

Dendrophysiological plant strategies of Poincianella pyramidalis (Tul.) L.P. Queiroz after wood herbivory in semiarid region of Paraíba - Brazil

Santana

Encinas

2016

Acta Sci. Biol. Sci.

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ABSTRACT. The increase in Equus africanus asinus Linnaeus population in semiarid areas of Northeast Brazil had significant impacts on wild and rural areas. The objective of this work was to analyze the herbivory of E. africanus asinus on Poincianella pyramidalis (Tul). L.P. Queiroz and determine the dendrophysiological strategies P. pyramidalis used during and after damage caused by E. africanus asinus. The selected areas have significant populations of P. pyramidalis with amplified importance value higher than 50%. Two areas were established: one control and another experimental, with presence of E. africanus asinus. The study was carried out from 2001 to 2015. The evaluated variables of P. pyramidalis were: sap flow, basic density, diameter, volume, biomass and leaf area index. The increase of abandoned E. africanus asinus in semiarid areas resulted in impact and responses from P. pyramidalis. This plant species compensates for biomass losses and physiological activities reduction with two strategies: i) increase in the belowground biomass stock, and ii) increase in sap flow in undisturbed branches.Keywords: ecological interactions, ecophysiology, survival strategies.Estratégias dendrofisiológicas em Poincianella pyramidalis (Tul.) L.P. Queiroz depois da herbivoria no tronco em regiões semiáridas na Paraíba -Brasil RESUMO. O aumento da população de Equus africanus asinus Linnaeus em áreas do Semiárido doNordeste brasileiro teve um impacto significativo sobre as áreas silvestres e rurais. O objetivo desse trabalho foi analisar a herbivoria de E. africanus asinus sobre a espécie vegetal Poincianella pyramidalis (Tul). L.P. Queiroz e quais as estratégias dendrofisiológicas que essa espécie (P. pyramidalis) utilizou no momento e depois do dano causado pelo E. africanus asinus. As áreas selecionadas possuem significante presença populacional de P. pyramidalis, com valor de importância ampliada maior do que 50%. Duas áreas foram estabelecidas: uma controle e outra experimental com a presença de E. africanus asinus. O estudo foi realizado de 2001 a 2015. As variáveis avaliadas de P. pyramidalis foram: fluxo da seiva, densidade básica, diâmetro, volume, biomassa e índice de área foliar. O aumento da população de E. africanus asinus abandonados em áreas do Semiárido resultou em impacto e respostas na espécie P. pyramidalis. Essa espécie vegetal compensou suas perdas dendrométricas e redução nas atividades fisiológicas com duas estratégias: i) aumento no estoque de biomassa abaixo da superfície do solo; e ii) aumento do fluxo de seiva nos ramos não impactados.Palavras-chave: interações ecológicas, ecofisiologia, estratégias de sobrevivência.

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Section: Discussionmentioning

confidence: 99%

Dendrophysiological plant strategies of Poincianella pyramidalis (Tul.) L.P. Queiroz after wood herbivory in semiarid region of Paraíba - Brazil

Santana

Encinas

2016

Acta Sci. Biol. Sci.

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“…It is an important indicator to determine the change of surface conditions such as temperature and aridity/humidity in desertification dynamics. In general, replacing vegetation with bare soil causes an increase in land surface albedo, and this increase in albedo implies degradation or desertification [22,49,50]. Therefore, albedo is also employed to assess the dynamics of desertification.…”

Section: Indicators For Desertification Assessmentmentioning

confidence: 99%

Satellite Monitoring the Spatial-Temporal Dynamics of Desertification in Response to Climate Change and Human Activities across the Ordos Plateau, China

Guo

Shi

et al. 2017

Remote Sensing

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Abstract:The Ordos Plateau, a typical semi-arid area in northern China, has experienced severe wind erosion events that have stripped the agriculturally important finer fraction of the topsoil and caused dust events that often impact the air quality in northern China and the surrounding regions. Both climate change and human activities have been considered key factors in the desertification process. This study used multi-spectral Landsat Thematic Mapper (TM), Enhanced Thematic Mapper Plus (ETM+) and Operational Land Imager (OLI) remote sensing data collected in 2000, 2006, 2010 and 2015 to generate a temporal series of the modified soil-adjusted vegetation index (MSAVI), bare soil index (BSI) and albedo products in the Ordos Plateau. Based on these satellite products and the decision tree method, we quantitatively assessed the desertification status over the past 15 years since 2000. Furthermore, a quantitative method was used to assess the roles of driving forces in desertification dynamics using net primary productivity (NPP) as a commensurable indicator. The results showed that the area of non-desertification land increased from 6647 km 2 in 2000 to 15,961 km 2 in 2015, while the area of severe desertification land decreased from 16,161 km 2 in 2000 to 8,331 km 2 in 2015. During the period 2006-2015, the effect of human activities, especially the ecological recovery projects implemented in northern China, was the main cause of desertification reversion in this region. Therefore, ecological recovery projects are still required to promote harmonious development between nature and human society in ecologically fragile regions like the Ordos Plateau.

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“…High temperature and decreasing precipitation in degraded areas result in reductions of vegetation, surface moisture and surface complexity. Therefore, the surfaces absorb little solar shortwave radiation, and the sensor receives high spectral radiances as albedo correspondingly increases [51]. Therefore, albedo is an important indicator of degraded land [52].…”

Section: Research Frameworkmentioning

confidence: 99%

Land Degradation Monitoring in the Ordos Plateau of China Using an Expert Knowledge and BP-ANN-Based Approach

Yue

Zhu

et al. 2016

Sustainability

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Abstract:Land degradation monitoring is of vital importance to provide scientific information for promoting sustainable land utilization. This paper presents an expert knowledge and BP-ANN-based approach to detect and monitor land degradation in an effort to overcome the deficiencies of image classification and vegetation index-based approaches. The proposed approach consists of three generic steps: (1) extraction of knowledge on the relationship between land degradation degree and predisposing factors, which are NDVI and albedo, from domain experts; (2) establishment of a land degradation detecting model based on the BP-ANN algorithm; and (3) land degradation dynamic analysis. A comprehensive analysis was conducted on the development of land degradation in the Ordos Plateau of China in 1990China in , 2000China in and 2010 The results indicate that the proposed approach is reliable for monitoring land degradation, with an overall accuracy of 91.2%. From 1990-2010, a reverse trend of land degradation is observed in Ordos Plateau. Regions with relatively high land degradation dynamic were mostly located in the northeast of Ordos Plateau. Additionally, most of the regions have transferred from a hot spot of land degradation to a less changed area. It is suggested that land utilization optimization plays a key role for effective land degradation control. However, it should be highlighted that the goals of such strategies should aim at the main negative factors causing land degradation, and the land use type and its quantity must meet the demand of population and be reconciled with natural conditions. Results from this case study suggest that the expert knowledge and BP-ANN-based approach is effective in mapping land degradation.

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Arid land monitoring using Landsat albedo difference images

Cited by 146 publications

References 2 publications

<b>Dendrophysiological plant strategies of <i>Poincianella pyramidalis</i> (Tul.) L.P. Queiroz after wood herbivory in semiarid region of Paraíba - Brazil

<b>Dendrophysiological plant strategies of <i>Poincianella pyramidalis</i> (Tul.) L.P. Queiroz after wood herbivory in semiarid region of Paraíba - Brazil

Satellite Monitoring the Spatial-Temporal Dynamics of Desertification in Response to Climate Change and Human Activities across the Ordos Plateau, China

Land Degradation Monitoring in the Ordos Plateau of China Using an Expert Knowledge and BP-ANN-Based Approach

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