The Characteristics Of Coastal Wetland Landscape And Vegetation Based On Remote Sensing

In recent years,due to the urban construction in Caofeidian,the original balance of the ecological environment has been destroyed.How to protect the ecological health of coastal wetland is one of the important issues facing wetland protection.Taking Caofeidian coastal wetland as a research area,the Landsat TM / OLI images were interpreted by remote sensing from 2003 to 2018,combined with the landscape index to analyze the spatial and temporal evolution of the landscape pattern.Using the method of envelope removal,first derivative,“three-sided” parameters,to analysis measure spectral data of vegetation and establish a biomass model.The following results are obtained:The wetland area was degraded due to human activities from 2011 to 2018.It landscape was fragmented and the concentration was reduced.The main transfers were to agricultural land and construction land.The spectral characteristics of typical vegetation wetland are different.In the bands of 413?678nm,380?678nm and 380?725nm,seasonal vegetation can be distinguished.At the end of the growing season,suaeda have obvious reflection peak at 638 nm.In the band of 560?678nm,380?678nm and 563?678nm,using envelope removal methods can distinguish seasonal vegetation.At the beginning of the growing season,suaeda have obvious reflection peak at 606 nm and 638 nm.In the bands of 518?716nm,525?714nm and 513?708nm,using the first derivative method can distinguish different vegetation.The above-ground fresh biomass can be estimated by analyzing the spectral characteristics,the difference vegetation index and polynomial function constructed by the first derivative spectrum at 950 nm,724nm and 813 nm,632nm build models are accurate.Study on wetland landscape pattern change,typical vegetation seasonal spectrum and biomass estimation.To master the structure and function of Caofeidian coastal wetland ecosystem and provide a theoretical basis for wetland vegetation identification,so as to better protect the ecological environment of Caofeidian wetland.Figure 25;Table 22;Reference 95...