农业科学与技术（英文版）
農業科學與技術（英文版）
농업과학여기술（영문판）
AGRICULTURAL SCIENCE & TECHNOLOGY
2009年
6期
164-167
,共4页
娜日苏%格根图%德勒格日玛
娜日囌%格根圖%德勒格日瑪
나일소%격근도%덕륵격일마
草甸草原%退化梯度%遥感%地物光谱%光谱特征
草甸草原%退化梯度%遙感%地物光譜%光譜特徵
초전초원%퇴화제도%요감%지물광보%광보특정
Meadow steppe%Degradation gradient%Remote sensing%Object spectrum%Spectral characteristic
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%;570nm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.
運用ISI921VF-256型地物光譜儀對內矇古西烏旂哈日根檯鎮賽溫都嘎查低山丘陵草甸草原的草群、裸地等進行光譜數據的提取,穫得其反射率光譜特徵.試驗結果錶明:不同地物的反射率不同,草甸草原草地群落的光譜反射麯線在可見光波段450和675 nm左右的藍光和紅光區形成吸收穀,反射率一般為5%～10%和10%～15%;570nm左右的綠光區為反射峰,反射率一般為10%～20%;在近紅外波段呈現彊烈的反射,700～760 nm,光譜反射值隨波長的增加而急劇升高,反射麯線陡而接近于直線的形態,從760nm開始,光譜反射值緩慢增加,反射率一般為25%～35%;裸地的反射麯線在可見光區高于草地群落,在近紅外區低于草地群落;在不同退化梯度下,草甸草原植物群落的光譜反射率,隨著退化梯度的加彊而增彊;在同一退化梯度下,大針茅群落對可見光的反射率小于冷蒿群落,而對近紅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譜特徵,併隨著退化程度的變化錶現一定的差異.
운용ISI921VF-256형지물광보의대내몽고서오기합일근태진새온도알사저산구릉초전초원적초군、라지등진행광보수거적제취,획득기반사솔광보특정.시험결과표명:불동지물적반사솔불동,초전초원초지군락적광보반사곡선재가견광파단450화675 nm좌우적람광화홍광구형성흡수곡,반사솔일반위5%～10%화10%～15%;570nm좌우적록광구위반사봉,반사솔일반위10%～20%;재근홍외파단정현강렬적반사,700～760 nm,광보반사치수파장적증가이급극승고,반사곡선두이접근우직선적형태,종760nm개시,광보반사치완만증가,반사솔일반위25%～35%;라지적반사곡선재가견광구고우초지군락,재근홍외구저우초지군락;재불동퇴화제도하,초전초원식물군락적광보반사솔,수착퇴화제도적가강이증강;재동일퇴화제도하,대침모군락대가견광적반사솔소우랭호군락,이대근홍외광적반사솔대우랭호군락;초전초원적불동지물구유기불동적광보특정,병수착퇴화정도적변화표현일정적차이.
ISI921VF-256 type ground object spectrometer was used to extract the spectral data of the meadow grassland and bare land to obtain their reflectivity 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 in the 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.
