退化草甸草原近地面光谱特征初探  

Preliminary Study on the Near-ground Spectral Characteristic of the Degraded Meadow Grassland

作　　者：娜日苏[1,2] 苏和[1] 格根图[3] 

机构地区：[1]中国农业科学院草原研究所,内蒙古呼和浩特010011 [2]内蒙古生态与农业气象中心,内蒙古呼和浩特010051 [3]内蒙古农业大学生态环境学院,内蒙古呼和浩特010010

出　　处：《安徽农业科学》2010年第5期2512-2514,共3页Journal of Anhui Agricultural Sciences

基　　金：内蒙古气象局科学技术研究项目"利用EOS/MODIS资料进行内蒙古典型草原牧草产量估测的研究(200618)

摘　　要：运用ISI921VF-256型地物光谱仪对内蒙古西乌旗哈日根台镇赛温都嘎查低山丘陵草甸草原的草群、裸地等进行光谱数据的提取,获得其反射率光谱特征。试验结果表明:不同地物的反射率不同,草甸草原草地群落的光谱反射曲线在可见光波段具有明显的峰谷特性,在近红外波段呈强反射;裸地的反射曲线在可见光区高于草地群落;在近红外区低于草地群落;在不同退化梯度下,草甸草原植物群落的光谱反射率,随着退化梯度的加强而增强;在同一退化梯度下,大针茅群落对可见光的反射率小于冷蒿群落,而对近红外光的反射率大于冷蒿群落;草甸草原的不同地物具有其不同的光谱特征,并随着退化程度的变化表现一定的差异。ISI921VF-256 type ground object spectrometer was used to extract the spectral data of the grassland and bare land to obtain their reflectivity spectral characteristics.The experiment was carried out on the low mountain and hilly area meadow steppe in the Saiwundu Village,Hargentai Town,West Ujumqin Banner,Xilin Gol League,Inner Mongolia.The results showed that different ground objects had different reflectances,the spectral reflectance curve of the meadow steppe plant communities had obvious characteristics of peak and valley in the visible spectrum band,and had strong reflection in the near-infrared band.The reflection curve of the bare lands in the visible spectrum band was higher than that of the grassland communities,while in the near-infrared band it was lower than that of the grassland communities.Under different degradation gradients,the spectral reflectivity of the meadow steppe grassland communities increased with the enhancement of the degradation gradients.Under the same degradation gradient,the Stipa grandis communities had a lower visible light reflectivity and a higher near-infrared reflectivity than the Artemisia frigida communities;different ground objects on the meadow steppe have different spectrum characteristics,and show a certain discrepancies with the changes of the degradation level.

关 键 词：草甸草原 退化梯度 遥感 地物光谱 光谱特征 

分 类 号：S812[农业科学—草业科学]