{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T04:20:59Z","timestamp":1760242859671,"version":"build-2065373602"},"reference-count":32,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2016,9,17]],"date-time":"2016-09-17T00:00:00Z","timestamp":1474070400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>The paper reports a technique used to construct a reference time series for the fraction of absorbed photosynthetically-active radiation (FAPAR) based on remotely-sensed data in the largest Russian arid wetland territory. For the arid Volga-Akhtuba wetlands, FAPAR appears to be an informative spectral index for estimating plant cover health and its seasonal and annual dynamics. Since FAPAR algorithms are developed for multiple satellite sensors, all FAPAR-based models are suggested to be universal and useful for future studies and long-term monitoring of plant cover, particularly in wetlands. The model developed in the present work for FAPAR temporal dynamics clearly reflects the field-observed seasonal and annual changes of plant cover in the Volga-Akhtuba floodplain wetlands. Various types of wetland plant communities were categorized by the specific parameters of the model seasonal vegetation curve. In addition, the values derived from the model function allow quantitative estimation of wetland plant cover health. This information is particularly important for the Volga-Akhtuba floodplain, because its hydrological regime is regulated by the Volzhskaya hydropower plant. The ecosystem is extremely fragile and sensitive to human impact, and wetland plant cover health is a key indicator of regulatory efficiency. The present study is another step towards developing a methodology focused on arid wetland vegetation monitoring and conservation of its biodiversity and natural conditions.<\/jats:p>","DOI":"10.3390\/rs8090762","type":"journal-article","created":{"date-parts":[[2016,9,19]],"date-time":"2016-09-19T10:07:43Z","timestamp":1474279663000},"page":"762","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["A Simple Harmonic Model for FAPAR Temporal Dynamics in the Wetlands of the Volga-Akhtuba Floodplain"],"prefix":"10.3390","volume":"8","author":[{"given":"Alexander","family":"Kozlov","sequence":"first","affiliation":[{"name":"Faculty of Mechanics and Mathematics, Moscow State University, Moscow 119991, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Maria","family":"Kozlova","sequence":"additional","affiliation":[{"name":"Information Support Department, State Oceanographic Institute, Moscow 119034, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nikolai","family":"Skorik","sequence":"additional","affiliation":[{"name":"Department of Information Technologies, Moscow Aviation Institute, Moscow 125993, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2016,9,17]]},"reference":[{"key":"ref_1","unstructured":"Saadati, S., and Eslamian, S. (2013, January 24\u201325). Application of indicators of hydrologic alteration for evaluating environmental impacts of Dam operation during drought periods: A case study. Proceedings of the 5th International Conference of Water Resources and Sustainable Development, Algiers, Algeria."},{"key":"ref_2","unstructured":"Kozlova, M.V., Gorelits, O.V., Sapozhnikova, A.A., Kozlov, A.V., and Zemlianov, I.V. Application of Spectral Indices Including Landsat Tasseled Cap Transformation to State Estimation of Wetlands under Natural and Regulated Hydrological Regime Changes and Direct Human Impact in Volga-Akhtuba Floodplain. Available online: https:\/\/istina.msu.ru\/publications\/article\/11455210\/."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"619","DOI":"10.1071\/BT03003","article-title":"Environmental flows, river salinity, and biodiversity conservation: Managing trade-offs in the Murray-Darling basin","volume":"51","author":"Goss","year":"2003","journal-title":"Aust. J. Bot."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"432","DOI":"10.1111\/j.1365-2664.2010.01945.x","article-title":"Flow regulation reduces native plant cover and facilitates exotic invasion in riparian wetlands","volume":"48","author":"Catford","year":"2011","journal-title":"J. Appl. Ecol."},{"key":"ref_5","unstructured":"Gorelits, O.V., Zemlianov, I.V., and Sapozhnikova, A.A. (2010). The Scientific and Practical Conference \u201cSpecially Protected Natural Areas of Lower Volga as the Essential for the Biodiversity Conservation: Results, Problems and Perspectives\u201d, Astrakhan University Publishing. (In Russian)."},{"key":"ref_6","unstructured":"Zemlianov, I.V., and Gorelits, O.V. (2008, January 26\u201327). The main tasks of the monitoring of water bodies in the Lower Volga. Proceedings of Water Resources of the Volga. Present, Future Management Challenges, Astrakhan, Russia. (In Russian)."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"421","DOI":"10.1890\/080119","article-title":"Climate and desertification: Looking at an old problem through new lenses","volume":"7","author":"Verstraete","year":"2009","journal-title":"Front. Ecol. Environ."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"71","DOI":"10.1007\/s11273-008-9119-1","article-title":"Wetlands and global climate change: The role of wetland restoration in a changing world","volume":"17","author":"Erwin","year":"2009","journal-title":"Wetl. Ecol. Manag."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"27","DOI":"10.1016\/j.jaridenv.2013.07.010","article-title":"Determination of water requirements of the Gavkhuni wetland, Iran: A hydrological approach","volume":"98","author":"Sarhadi","year":"2013","journal-title":"J. Arid. Environ."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"1082","DOI":"10.1007\/s13280-014-0495-x","article-title":"Water planning and Hydro-Climatic Change in the Murray-Darling Basin, Australia","volume":"43","author":"Grafton","year":"2014","journal-title":"AMBIO"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"517","DOI":"10.1016\/j.ecoleng.2015.05.042","article-title":"A constructed treatment wetland as an opportunity to enhance biodiversity and ecosystem services","volume":"82","author":"Semeraro","year":"2015","journal-title":"Ecol. Eng."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"1773","DOI":"10.1016\/j.asr.2007.05.066","article-title":"An automatic procedure to identify key vegetation phenology events using the JRC-FAPAR products","volume":"41","author":"Verstraete","year":"2008","journal-title":"Adv. Space Res."},{"key":"ref_13","first-page":"1","article-title":"Sustaining healthy freshwater ecosystems","volume":"10","author":"Baron","year":"2003","journal-title":"Issues Ecol."},{"key":"ref_14","first-page":"51","article-title":"Analysis of vegetation-based management scenarios using MCDM in the Ramian watershed, Golestan, Iran","volume":"4","author":"Sadoddin","year":"2010","journal-title":"Int. J. Plant Prod."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"861","DOI":"10.5194\/hess-8-861-2004","article-title":"Defining environmental river flow requirements\u2014A review","volume":"8","author":"Acreman","year":"2004","journal-title":"Hydrol. Earth Syst. Sci."},{"key":"ref_16","first-page":"39","article-title":"Estimate of vegetation dynamics along the transect in the northern part of the Volga-Akhtuba floodplain","volume":"15","author":"Starichkova","year":"2009","journal-title":"Arid. Ecosyst."},{"key":"ref_17","first-page":"12","article-title":"Indication of the environment change on transect in the Volga-Akhtuba flood-plain near Kapustin Yar village by using of Ramenskiy indicator values and DCA-ordination","volume":"10","author":"Sorokin","year":"2010","journal-title":"Vestnik Volz. Univ. V.N. Tatischev"},{"key":"ref_18","first-page":"52","article-title":"Dynamics of meadow vegetation in the northern part of Volga-Akhtuba floodplain (1928\u20132009)","volume":"12","author":"Golub","year":"2011","journal-title":"Vestnik Volz. Univ. V.N. Tatischev"},{"key":"ref_19","first-page":"107","article-title":"Estimate of vegetation dynamics along the transect of the southern part of the Volga-Akhtuba floodplain near Hosheutovo village","volume":"13","author":"Golub","year":"2011","journal-title":"Izv. Samar. Nauchnogo Tsentra Russ. Acad. Sci."},{"key":"ref_20","first-page":"431","article-title":"Vegetation dynamics estimation along a transect in the Volga-Akhtuba floodplain near Kapustin Yar village","volume":"4","author":"Iolin","year":"2011","journal-title":"Povolz. Ekol. Zhurnal"},{"key":"ref_21","unstructured":"European Commission JRC FAPAR Algorithm. Available online: fapar.jrc.ec.europa.eu\/WWW\/Data\/Pages\/FAPAR_Algorithms\/FAPAR_Algorithms_Fapar.php."},{"key":"ref_22","first-page":"9","article-title":"Modern mechanism of flooding in the territories of the Volga-Akhtuba floodplain during flood (within Volgograd region)","volume":"2","author":"Gorelits","year":"2013","journal-title":"Sci. Potential Reg. Serv. Mod. Spec. Issue"},{"key":"ref_23","unstructured":"Kozlova, M.V., Sapozhnikova, A.A., Zemlianov, I.V., and Gorelits, O.V. (2015). The assessment of plant cover conditions at Volga-Akhtuba valley based on Remotely Sensed data and analysis of hydrological regime parameters during a period of regulated Volga runoff. (In Russian)."},{"key":"ref_24","unstructured":"(2003). Summary Report of the Eleventh Session of the WMO-IOC-UNEP-ICSU, Steering Committee for GCOS, WMO\/TD 1189, World Meteorological Organization."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"241","DOI":"10.1016\/j.rse.2013.08.037","article-title":"Evaluation of six satellite-derived Fraction of Absorbed Photosynthetic Active Radiation (FAPAR) products across the Australian continent","volume":"140","author":"Canadell","year":"2014","journal-title":"Remote Sens. Environ."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"1871","DOI":"10.1016\/j.rse.2007.09.011","article-title":"Uncertainty estimates for the FAPAR operational products derived from MERIS\u2014Impact of top-of-atmosphere radiance uncertainties and validation with field data","volume":"112","author":"Gobron","year":"2008","journal-title":"Remote Sens. Environ."},{"key":"ref_27","doi-asserted-by":"crossref","unstructured":"Gobron, N., Pinty, B., Aussedat, O., Chen, J.M., Cohen, W.B., Fensholt, R., Gond, V., Huemmrich, K.F., Lavergne, T., and M\u00e9lin, F. (2006). Evaluation of fraction of absorbed photosynthetically active radiation products for different canopy radiation transfer regimes: Methodology and results using Joint Research Center products derived from SeaWiFS against ground-based estimations. J. Geophys. Res., 111.","DOI":"10.1029\/2005JD006511"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"9431","DOI":"10.1029\/96JD04013","article-title":"A semidiscrete model for the scattering of light by vegetation","volume":"102","author":"Gobron","year":"1997","journal-title":"J. Geophys. Res."},{"key":"ref_29","unstructured":"Weiss, M., and Baret, F. (2011, January 10\u201315). fAPAR (fraction of Absorbed Photosynthetically Active Radiation) estimates at various scale. Proceedings of the 34th International Symposium on Remote Sensing of Environment, Sydney, Australia."},{"key":"ref_30","unstructured":"Klisch, A., Royer, A., Lazar, C., Baruth, B., and Genovese, G. (December, January 30). Extraction of phenological parameters from temporally smoothed vegetation indices. Proceedings of ISPRS WG VIII\/10 Workshop: Remote Sensing Support to Crop Yield Forecast and Area Estimates, Stresa, Italy."},{"key":"ref_31","unstructured":"European Commission JRC FAPAR Download Page. Available online: fapar.jrc.ec.europa.eu\/WWW\/Data\/Pages\/FAPAR_Download\/FAPAR_Download.php."},{"key":"ref_32","unstructured":"Pinty, B., Gobron, N., M\u00e9lin, F., and Verstraete, M.M. (2002). A Time Composite Algorithm for FAPAR Products. Theoretical Basis Document. Version 1.0, Institute for Environment and Sustainability Joint Research Centre."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/8\/9\/762\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T19:31:06Z","timestamp":1760211066000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/8\/9\/762"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2016,9,17]]},"references-count":32,"journal-issue":{"issue":"9","published-online":{"date-parts":[[2016,9]]}},"alternative-id":["rs8090762"],"URL":"https:\/\/doi.org\/10.3390\/rs8090762","relation":{},"ISSN":["2072-4292"],"issn-type":[{"type":"electronic","value":"2072-4292"}],"subject":[],"published":{"date-parts":[[2016,9,17]]}}}