内蒙古草原枯草期可燃物量遥感估测模型研究

Remote sensing estimation model for the withered season fuel weight in Inner Mongolia grassland

可燃物量是草原火险预警研究中的主要指标。国内外草原火险预警研究都是基于生长季的可燃物量,但在我国草原火灾多数发生在枯草期,因此,为了提高草原火险预警精度急需建立枯草期可燃物量遥感估测模型。文中以内蒙古草原为研究区,结合可燃物量实测数据和EOS/MODIS数据,应用回归分析方法建立枯草期可燃物量估测模型。结果表明:建立的模型能够准确的反演内蒙古各草地的枯草期可燃物量。精度检验结果表明:典型草原、草原化荒漠和荒漠反演结果与实测的相关性分别为0.78、0.84、0.71;草甸草原和荒漠草原分别为0.71和0.78的显著相关。内蒙古草原枯草期可燃物量遥感估测模型的建立对内蒙古草原火险预警具有重要意义。

Combustible material is the main index for researching of fire risk warning over grassland area. Domestic and overseas studies on fire risk warning over grassland area have been based on combustible materials of growing season,but in China,the majority of grassland fires occurred in withered period,therefore,there exists urgent need to establish remote sensing estimation model for the withered season fuel weight in order to improve the accuracy of the grassland fire risk warning. Inner Mongolia grassland was chosen as the research area and combined with measured combustible materials data and EOS /MODIS data,withered season fuel weight estimation model was established by applying the regression analysis method. The result shows that the model can do accurate inversion for the withered season combustible materials in Inner Mongolia. Accuracy test proved that the correlation coefficient between measured data and the inversion result of typical steppe,steppe- desert and desert are respectively 0. 78,0. 84,0. 71,all highly significant correlated; Meadow steppe and desert steppe are 0.71 and 0. 78 significant correlated. Remote sensing estimation model of the withered season fuel weight in Inner Mongolia grassland has critical meaning for fire risk warning over grassland area.