Integrated Evaluation of Vegetation Drought Stress through Satellite Remote Sensing
| Autor: | Daniela Avetisyan, Denitsa Borisova, Emiliya Velizarova |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
vegetation response 010504 meteorology & atmospheric sciences Elevation Forestry Vegetation Land cover spectral reflectance profiles 010603 evolutionary biology 01 natural sciences Ecosystem services Forest ecology Environmental science spectral indices Terrestrial ecosystem Ecosystem Physical geography Precipitation QK900-989 Sentinel-2 Plant ecology Bulgaria 0105 earth and related environmental sciences |
| Zdroj: | Forests Volume 12 Issue 8 Forests, Vol 12, Iss 974, p 974 (2021) |
| ISSN: | 1999-4907 |
| DOI: | 10.3390/f12080974 |
| Popis: | In the coming decades, Bulgaria is expected to be affected by higher air temperatures and decreased precipitation, which will significantly increase the risk of droughts, forest ecosystem degradation and loss of ecosystem services (ES). Drought in terrestrial ecosystems is characterized by reduced water storage in soil and vegetation, affecting the function of landscapes and the ES they provide. An interdisciplinary assessment is required for an accurate evaluation of drought impact. In this study, we introduce an innovative, experimental methodology, incorporating remote sensing methods and a system approach to evaluate vegetation drought stress in complex systems (landscapes and ecosystems) which are influenced by various factors. The elevation and land cover type are key climate-forming factors which significantly impact the ecosystem’s and vegetation’s response to drought. Their influence cannot be sufficiently gauged by a traditional remote sensing-based drought index. Therefore, based on differences between the spectral reflectance of the individual natural land cover types, in a near-optimal vegetation state and divided by elevation, we assigned coefficients for normalization. The coefficients for normalization by elevation and land cover type were introduced in order to facilitate the comparison of the drought stress effect on the ecosystems throughout a heterogeneous territory. The obtained drought coefficient (DC) shows patterns of temporal, spatial, and interspecific differences on the response of vegetation to drought stress. The accuracy of the methodology is examined by field measurements of spectral reflectance, statistical analysis and validation methods using spectral reflectance profiles. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|