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

退化草甸草原近地面光谱特征初探(英文)

作　　者：娜日苏[1,2] 格根图[3] 德勒格日玛 

机构地区：[1]内蒙古生态与农业气象中心,内蒙古呼和浩特010051 [2]中国农科院草原研究所,内蒙古呼和浩特010111 [3]内蒙古农业大学生态环境学院,内蒙古呼和浩特010010 [4]内蒙古气象台,内蒙古呼和浩特010051

出　　处：《Agricultural Science & Technology》2009年第6期164-167,共4页农业科学与技术（英文版）

基　　金：Supported by Inner Mongolia Meteorological Brueau Technology ResearchProject(200618)~~

摘　　要：IS1921 VF-256 type ground object spectrometer was used to extract the spectral data of the meadow grassland and bare land to obtain their refleotivity spectral characteristics. The experiment was carried out on the low mountain 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 meadow grassland communities while inthe near-infrared band it was lower than that of the meadow 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 than the Artemisia frigida communities but had a higher near-infrared reflectivity than the Artemisia frigida communities; different ground objects on the meadow steppe had different spectrum characteristic, and showed a certain discrepancies with the changes of the degradation level.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450和675 nm左右的蓝光和红光区形成吸收谷,反射率一般为5%～10%和10%～15%;570 nm左右的绿光区为反射峰,反射率一般为10%～20%;在近红外波段呈现强烈的反射,700～760 nm,光谱反射值随波长的增加而急剧升高,反射曲线陡而接近于直线的形态,从760nm开始,光谱反射值缓慢增加,反射率一般为25%～35%;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。

关 键 词：Meadow steppe Degradation gradient Remote sensing Object spectrum Spectral characteristic 

分 类 号：S812[农业科学—草业科学] S812.3[农业科学—畜牧学]