干旱区生态环境知识资源中心(Arid): 甘肃河西地区荒漠化土地光谱特征研究

Arid

	甘肃河西地区荒漠化土地光谱特征研究
其他题名	Spectral Characteristics of Desertification Land in Gansu Hexi Corridor
	魏怀东 1; 李亚 2; 张勃 3; 李菁菁 2; 丁峰 2; 陈芳 2
来源期刊	光谱学与光谱分析
ISSN	1000-0593
出版年	2019
卷号	39 期号:11 页码:3508-3513
中文摘要	甘肃河西走廊土地荒漠化严重影响了当地居民的生产生活环境,高光谱遥感技术是荒漠化土地退化程度、土地类型识别、遥感反演等的重要研究手段,以河西地区荒漠化土地为研究对象,分析其光谱特征与植被退化程度、植物类型、季节变化等的关系,探讨河西地区荒漠化土地的光谱特征。主要结果有:(1)当植被覆盖度小于20%,同一类型不同退化阶段的植被光谱对沙地光谱的影响很小,沙地光谱反射率与裸地接近,尤其当植被盖度小于10%时,沙地与裸地的光谱曲线几乎重合,仅从植被景观很难反映出土地的沙化程度。(2)不同的植被类型对沙地光谱的反射率有一定的影响,以白刺为建群种的沙地光谱反射率较高,其次为梭梭沙地,多枝柽柳沙地相对较低,植被不同演替阶段下指示性植物的沙地光谱可以反映土地的沙化过程。(3)在植物生长季,沙地光谱反射率受土壤、植物含水量及植物物候期的影响,8月-10月高于其他月份,7月最低,沙地光谱波形曲线的季节变化规律可以反映出沙地土壤含水量的变化。研究结果对荒漠化土地遥感监测中土地沙化程度判定、季节信息提取、植被覆盖度估算等提供研究基础。
英文摘要	The desertification of Gansu Hexi Corridor is serious,which seriously affects the environment of living and production activities of local residents.Hyperspectral remote sensing technology is an important research method for desertification land degradation degree,land type identification and remote sensing inversion.This paper takes desertification land in Hexi area as the study object.The object was analyzed for the relationship between its spectral characteristics and vegetation degradation degree, plant type,season and soil type,and the spectral characteristics of desertified land in Hexi region were discussed.The main results are as follows:(1)When the vegetation coverage is less than 20%,the vegetation degradation has little effect on the sand spectrum in different degradation stages of the same vegetation type,and the spectral reflectance of the sand is close to the bare land,especially when the vegetation coverage is less than 10%,the spectral curves of sand and bare land almost coincide, and it is difficult to reflect the degree of desertification of the land only from the vegetation landscape.(2)Different vegetation types have a certain influence on the reflectivity of sandy land spectrum.The spectral reflectance of sandy land with Nitraria tangutorum Bobr as constructive species is higher,followed by Haloxylon ammodendronsandy land,and the Tamarix ramosissim sandy land are relatively low.The sandy spectrum of the indicator plants under different succession stages of vegetation can reflect the desertification process of the land.(3)During the plant growing season,the spectral reflectance of sandy land is affected by soil,plant water content and plant phenology,which is higher than other months from August to October and lowest in July.The seasonal variation of the spectral curve of sandy land can reflect the changes in soil water content in sandy land.The research results provide a research basis for the determination of land desertification degree,seasonal information extraction and vegetation coverage estimation in remote sensing monitoring of desertification land.
中文关键词	河西地区 ; 荒漠化土地 ; 光谱特征
英文关键词	Hexi area Desertification land Spectral characteristics
语种	中文
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:6607109
来源机构	西北师范大学 ; 甘肃省治沙研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/316125
作者单位	1.西北师范大学地理与环境科学学院;;甘肃省治沙研究所, ;;, 兰州;;兰州, 甘肃;;甘肃 730070;;730070, 中国; 2.甘肃省治沙研究所, 兰州, 甘肃 730070, 中国; 3.西北师范大学地理与环境科学学院, 兰州, 甘肃 730070, 中国
推荐引用方式 GB/T 7714	魏怀东,李亚,张勃,等. 甘肃河西地区荒漠化土地光谱特征研究[J]. 西北师范大学, 甘肃省治沙研究所,2019,39(11):3508-3513.
APA	魏怀东,李亚,张勃,李菁菁,丁峰,&陈芳.(2019).甘肃河西地区荒漠化土地光谱特征研究.光谱学与光谱分析,39(11),3508-3513.
MLA	魏怀东,et al."甘肃河西地区荒漠化土地光谱特征研究".光谱学与光谱分析 39.11(2019):3508-3513.