摘要
植物吸收性光合有效辐射分量(FPAR)是描述植被结构以及与之相关的物质与能量交换过程的基本生理变量。选取内蒙古呼伦贝尔谢尔塔拉镇针茅和羊草草甸草原为研究对象,利用2013年5次地面实测实验,通过HJ-I CCD高分辨率卫星影像建立统计模型,从而实现对该研究区MODIS/FPAR产品的验证与分析。1km HJ/FPAR"真值"与MODIS/FPAR产品值的变化趋势基本一致,并且二者具有较好的一致性,R2达到了0.6762。MODIS/FPAR产品能够很好地反映呼伦贝尔草甸草原在整个生长季的长势及物候变化,这是因为研究区样地尺度上HJ/FPAR和MODIS/FPAR产品值不但变化趋势相一致,而且相关系数R2高达0.9148。无论在同尺度(1km)还是整个研究区尺度,MODIS/FPAR均有一定的高估现象。研究结果对了解和进一步使用该地区的MODIS/FPAR产品具有重要的指导意义。
Fraction of absorbed Photosynthetically Active Radiation（FPAR）is a basic physiological variable that describing vegetation structure and the process of related material and energy exchange.Focus on the meadow steppe in Xieertala,Hulunber,Inner Mongolia,by five field experiments in 2013,through the bridge of high spatial resolution HJ-1CCD images,statistical modes between measured FPAR and VIs that calculated from images was established,achieved validation and analysis of MODIS/FPAR product.The＂true value＂of 1km HJ/FPAR is cosistent with the trend of MODIS/FPAR product value,and has a higher consistency,R2 reached to 0.6762.MODIS/FPAR product can reflect grassland accuracy and phenology of the whole growing season of meadow steppe in Hulunber,because there also has a consistent trend between HJ/FPAR and MODIS/FPAR on the scale of study area,and the correlation coefficient is up to 0.9148.MODIS/FPAR product has some overestimation phenomenon both in the same sacle（1km）throughtout the study area.The results are important to understand and further use MODIS/FPAR product of Hulunber meadow steppe.
出处
《遥感技术与应用》
CSCD
北大核心
2015年第6期1129-1137,共9页
Remote Sensing Technology and Application
基金
国家863计划项目(2012AA102003-4
2012AA120905)
国家国际科技合作项目(2012DFA31290)
国家国际科技合作专项项目(2012DFA31290)
国家科技支撑计划项目(2012BAC19B04
2013BAC03B02)资助
