Applying remote sensing techniques to monitoring seasonal and interannual changes of aquatic vegetation in Taihu Lake, China

Luo, Jiancheng; Li, Xinchuan; Ma, Ronghua; Li, Fēi; Duan, Hongtao; Hu, Weiping; Qin, Boqiang; Huang, Wenjiang

doi:10.1016/j.ecolind.2015.07.029

Cited by 125 publications

(68 citation statements)

References 34 publications

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“…Suitable sensors must deploy bands in the visible and near-infrared (VNIR) wavelengths with high radiometric sensitivity such as ocean colour sensors (e.g., MODIS and MERIS). Owing to their spatial resolution (≥300 m), studies conducted with these sensors focus mainly on large lakes such as Lake Balaton [15], Lake Geneva [16], Lake Taihu [17][18][19], or Great Lakes [20], but rarely on small lakes [21,22]. Studies on smaller lakes refer to less sensitive Landsat data [23] or to high spatial resolutions from commercial sensors such as WorldView [24] or Quickbird [25].…”

Section: Introductionmentioning

confidence: 99%

Water Constituents and Water Depth Retrieval from Sentinel-2A—A First Evaluation in an Oligotrophic Lake

et al. 2016

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Satellite remote sensing may assist in meeting the needs of lake monitoring. In this study, we aim to evaluate the potential of Sentinel-2 to assess and monitor water constituents and bottom characteristics of lakes at spatio-temporal synoptic scales. In a field campaign at Lake Starnberg, Germany, we collected validation data concurrently to a Sentinel-2A (S2-A) overpass. We compared the results of three different atmospheric corrections, i.e., Sen2Cor, ACOLITE and MIP, with in situ reflectance measurements, whereof MIP performed best (r = 0.987, RMSE = 0.002 sr −1 ). Using the bio-optical modelling tool WASI-2D, we retrieved absorption by coloured dissolved organic matter (a CDOM (440)), backscattering and concentration of suspended particulate matter (SPM) in optically deep water; water depths, bottom substrates and a CDOM (440) were modelled in optically shallow water. In deep water, SPM and a CDOM (440) showed reasonable spatial patterns. Comparisons with in situ data (mean: 0.43 m −1 ) showed an underestimation of S2-A derived a CDOM (440) (mean: 0.14 m −1 ); S2-A backscattering of SPM was slightly higher than backscattering from in situ data (mean: 0.027 m −1 vs. 0.019 m −1 ). Chlorophyll-a concentrations (~1 mg·m −3 ) of the lake were too low for a retrieval. In shallow water, retrieved water depths exhibited a high correlation with echo sounding data (r = 0.95, residual standard deviation = 0.12 m) up to 2.5 m (Secchi disk depth: 4.2 m), though water depths were slightly underestimated (RMSE = 0.56 m). In deeper water, Sentinel-2A bands were incapable of allowing a WASI-2D based separation of macrophytes and sediment which led to erroneous water depths. Overall, the results encourage further research on lakes with varying optical properties and trophic states with Sentinel-2A.

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Section: Introductionmentioning

confidence: 99%

Water Constituents and Water Depth Retrieval from Sentinel-2A—A First Evaluation in an Oligotrophic Lake

et al. 2016

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“…Research based on remote sensing techniques and vegetation indexes (Schwartz, 1998;Pettorelli et al, 2005) delved deeper into the description of the spring phenology advance in terrestrial plants, the so called "green up", through latitudinal gradients. For aquatic ecosystems, recent examples of the application of these methods exist (Hestir et al, 2015;Luo et al, 2016), but no information is available concerning the effect of latitude on the reproductive phenology of submerged aquatic plant species or the fulfilment of Hopkins' Law.…”

Section: Introductionmentioning

confidence: 99%

Time and heat for sexual reproduction: comparing the phenology of Chara hispida of two populations at different latitudes

et al. 2017

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Corresponding author: Sara.Calero@uv.es life events. In addition, studying phenology is the simplest procedure to track current global warming and its effects on the success and survival of different populations of the same species. Little is known about the effect of water temperature and its corresponding accumulated heat on charophytes' phenology. We compared differences in water temperature and sexual reproductive phenology of Chara hispida in two ponds of two countries located at different latitudes (Spain and Switzerland) over the same year. We estimated the accumulated heat required to develop from one phenophase to another (unripe/ripe gametangia and oospores). Curve fitting techniques on water temperature showed an advance of 26 days in the Spanish spring 2 onset. All phenological events happened for the first time around 40 days earlier in the Spanish pond, agreeing with the Hopkins' Bioclimatic Law prediction. C. hispida sexually reproduced in a daily mean temperature (DMT) range of 10-25°C and needed 600 growing degree-days (GDD) to ripen gametangia in the Spanish pond. The Swiss population required a higher DMT (15°C) to begin to reproduce, and ~700 GDD to initiate gametangia ripening. Temperature (as well as radiation) is one of the most important drivers of reproductive phenology, and accumulated heat is a better predictor than DMT for charophyte phenology. In the foreseeable warming scenario, we assume that C. hispida sexual events would advance by more than one month in Switzerland and expand at the end of the season, considerably lengthening its reproductive period.

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“…Macrophytes are important components of aquatic ecosystems (Flint & Madsen 1995, Luo et al 2016, since they present links between sediment, water and atmosphere. By creating microhabitats for periphy ton, fish eggs and shelter for many organisms, macro phytes contribute to higher biodiversity and greater heterogeneity of aquatic ecosystems (Laassen & Nolet 2007, Lampert & Sommer 2007.…”

Section: Discussionmentioning

confidence: 99%

“…Macrophytes are important for evaluating human impact on lake ecosys tems and indirectly in the management plans for water. Makrofiti imajo pomembno vlogo v vodnih ekosiste mih (Flint & Madsen 1995, Luo et al 2016, saj so povezovalni člen med sedimentom, vodo in ozračjem. S tvorjenjem mikrohabitatov za perifiton, mest za od laganja jajčec rib in skrivališč mnogih organizmov, vplivajo na večjo biodiverziteto in heterogenost vodne ga ekosistema (Klaassen & Nolet 2007, Lampert & Sommer 2007.…”

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Pomen makrofitov v jezerskem ekosistemu / The importance of macrophytes in lake ecosystem

Šiling¹,

Germ

2017

Folia Biologica Et Geologica

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IZVLEČEK Pomen makrofitov v jezerskem ekosistemuV preglednem članku povzemamo temeljne značilnosti makrofitov v jezerskem ekosistemu. Makrofiti so povezoval ni člen med sedimentom, vodo in ozračjem. Vodne rastline vplivajo na zgradbo habitata, prav tako pa so vir avtohtonih snovi, ki so osnova za prehranjevalni splet. Rast vodnih rast lin je odvisna od mnogih okoljskih dejavnikov, ki so med seboj povezani svetloba, temperatura, vodni tok, globina ipd. Za prehod od velike kalnosti do prosojnosti vode v jeze ru sta značilni spremembi v prevladi skupin primarnih pro ducentov in vrst v celotnem prehranjevalnem spletu, kjer namesto prevladujočega fitoplanktona postanejo prevla dujoči primarni producenti submerzni makrofiti ali peri fitonske alge. Makrofiti so pomembni tudi za vrednotenje človekovega vpliva na jezerski ekosistem ter posredno pri izvajanju upravljavskih načrtov za vode.Ključne besede: makrofiti, jezera, fitoplankton, ekološko stanje ABSTRACT The importance of macrophytes in lake ecosystemIn a review paper we summarized the basic features of macrophytes in lake system. Macrophytes present link be tween sediment, water and atmosphere. Primarily aquatic plants determine the structure of habitat and present the vital source of autochthonous matter as a base for food web. The growth of aquatic plants depends on a number of envi ronmental factors, which are linked light, temperature, water flow, depth etc. Transition from high turbidity to the transparency of the water in the lake is characterized by a change in the dominance of primary producers and species throughout the food web, where instead of the dominant phytoplankton the dominant primary producers becomes submerged macrophytes or periphytic algae. Macrophytes are important for evaluating human impact on lake ecosys tems and indirectly in the management plans for water. Makrofiti imajo pomembno vlogo v vodnih ekosiste mih (Flint & Madsen 1995, Luo et al. 2016, saj so povezovalni člen med sedimentom, vodo in ozračjem. S tvorjenjem mikrohabitatov za perifiton, mest za od laganja jajčec rib in skrivališč mnogih organizmov, vplivajo na večjo biodiverziteto in heterogenost vodne ga ekosistema (Klaassen & Nolet 2007, Lampert & Sommer 2007. S svojim koreninskim sistemom in listi absorbirajo hranila in na ta način čistijo vodo (Zhou et al. 2017) ter istočasno povečujejo koncentracijo hranil ko odmrejo in razpadejo. Lahko delujejo kot indika torji kakovosti vode in sodelujejo pri kroženju hranil. Vključeni so v ekosistemske procese kot so biominera lizacija, transpiracija, izpust biogenih plinov v ozračje in sedimentacija (Carpenter & Lodge 1986). Izločajo tudi alelopatske snovi, ki vplivajo na prehranjevalni splet. Zavirajo rast fitoplanktona, bakterioplanktona (Mulderij et al. 2006) in epifitskih alg , Cerbin et al. 2007, Gross et al. 2007, Wu et al. 2007. Raziskovalci so ugotovili, da alelopatski učinki makrofitov lahko vplivajo na velik del sprememb raz položljivega ogljika v jezerih (Hilt & Gross 2008, Hilt 2006, Jürgens & Jeppesen 1998, Cerbin et al. 20...

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Applying remote sensing techniques to monitoring seasonal and interannual changes of aquatic vegetation in Taihu Lake, China

Cited by 125 publications

References 34 publications

Water Constituents and Water Depth Retrieval from Sentinel-2A—A First Evaluation in an Oligotrophic Lake

Water Constituents and Water Depth Retrieval from Sentinel-2A—A First Evaluation in an Oligotrophic Lake

Time and heat for sexual reproduction: comparing the phenology of Chara hispida of two populations at different latitudes

Pomen makrofitov v jezerskem ekosistemu / The importance of macrophytes in lake ecosystem

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