若尔盖高寒沼泽植被生物量遥感估算研究

Satellite Remote Sensing Estimation of Biomass in Ruoergai Alpine Marshes

采用若尔盖高寒沼泽2011—2012年TM5遥感数据和同期野外调查获得的32个样地湿地植被生物量数据,分析了遥感影像光谱特征、纹理特征以及地形特征与实测样点地上、地下和总生物量的相关关系并建立多元逐步回归模型,进而计算生物量,结果表明:草本沼泽植被生物量与地形因子和纹理特征的相关性不强,与遥感影像及其植被指数等自变量有显著的相关关系。若尔盖高寒沼泽的植被地上、地下、总生物量分别为367.05,3 680.36,4 048.01g/m2。随着地表水分的减少,生物量呈现先增加后减少的趋势。

In this paper,the TM5 image of July and August 2011-2012 and 32 sites of aboveground bio-mass(AGB)and underground biomass(BGB)data of the Rouergai marshes in the same period were used as the data source to establish the estimation models.We examined the relationship between AGB,BGB, total biomass(TB)and spectral information from remote sensing images,topographic factors and texture features.The best estimation models were established.The main results are as follows:Both topographic factors and texture features has no correlation to the herbaceous biomass.There were allometric relation-ship(p <0.05)between biomass and remote sensing image,vegetation index.The average aboveground bi-omass(AGB),underguound biomass(BGB)and total biomass(TB)for the Rouergai alpine marshes were 367.05,3680.36 and 4048.01 /gm2 ,respectively.With the reduction of surface water,the biomass in-creased first and then decreased.