Spartina alterniflora Monitoring and Change Analysis in Yellow River Delta by Remote Sensing Technology
In order to prevent the coastal erosion,the Spartina spp.was introduced to the Yellow River Delta in about 1990.Now it has become an invasive planting with the trend of explosive growth,which definitely does harm to the local ecological security.By using 24 Landsat remote sensing images which covered the Yellow river delta form 1990 to 2013, we monitored the spatial distribution year by year,and analyzed its dynamics in four sub-regions and four time periods according to the Spartina alterniflora distribution and dynamic characteristics.On this basis,we analyzed the reasons for the changes of Spartina alterniflora with the help of the annual water volume and sediment of the Yellow River observed in Lijin station.The findings are as follows.(1)The total area of Spartina alterniflora experienced dramatic changes from 1990 to 2013.Three significant decreases in area were found in 1994,2000 and 2006,respectively,and the maxima were achieved in 1992,2003,2005 and 2012,respectively.The largest area was about 1 138 hm2 in 1992,and the minimum appeared in 2001,less than 30 hm2 .(2)The spatial distribution of Spartina alterniflora expanded from the northwest to the southeast in the past 24 years.But the four sub-regional dynamics showed that the introduction of Sparti-na alterniflora communities was failed to curb the coastal erosion.
invasive vegetationSpartina alternifloraremote sensing monitoringYellow River delta
国家科技期刊平台
NSTL
万方数据
维普
