摘要
基于QuickBird影像,采用人机交互方法提取了塔里木河下游不同离河距离胡杨、柽柳树冠信息,以实测数据为真值检验遥感提取冠幅、郁闭度及混交比精度;并建立了胡杨冠幅、胸径、树高关系模型,为塔里木河流域植被调查、生物量估测及生态恢复评价提供依据和方法借鉴.结果表明:胡杨、柽柳冠幅提取精度分别为84.00%、76.24%;林分郁闭度、混交比提取精度分别为69.45%、66.96%.基于实测数据建立的冠幅与胸径、胸径与树高模型相关显著(R2>0.8,P<0.01);根据遥感解译因子反演胡杨胸径、树高的平均精度分别为80.33%、89.25%.
Using the method of man-computer interaction to Abstract and analyze the crown of Populus euphratica and Tamarix ramosissima at different distance from the stream channel based on the high resolution remote sensing QuickBird in the lower reaches of Tarim River.According to the field investigation data,we tested the interpretation accuracy of tree-crown,canopy closure and mixed ratio,and established the model between crown,diameter at breast height and tree height.The results show that：crown interpretation accuracy of P.euphratica and T.ramosissima is higher,which reached 84.00%,76.24%,respectively;While the interpretation accuracy of canopy closure and mixed ratio is lower,which reached 69.45%,66.96%,respectively.There is still some work needed to improve the accuracy of interpretation.Correlative models are built according to the field measured data.Correlative analysis reveals significant positive correlation between tree-crown and diameter at breast height,diameter at breast height and tree-height（R^20.8,P〈0.01）.The accuracy inversion of the created models is also analyzed,and the results show that the mean accuracy of the models is 80.33% and 89.25%,respectively.These conclusions will offer references for biomass estimation,canopy closure and mixed ratio of forest using remote sensing image.It also can provide basis for habitat class division and evaluation.Especially,visual factor has been extracted from the remote sensing image in this article;this can supply referential method for the study of response to water delivery and ecological restoration evaluation.
出处
《西北植物学报》
CAS
CSCD
北大核心
2011年第9期1878-1885,共8页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家自然科学基金(40961027)
新疆草地资源与生态实验室资助
关键词
QUICKBIRD影像
人机交互
冠幅
信息提取
相关分析
塔里木河下游
QuickBird image
man-computer interaction
tree-crown
information distraction
correlation analysis
lower reaches of Tarim River
