干旱区生态环境知识资源中心(Arid): 苔藓结皮影响干旱半干旱植被指数的稳定性

Arid

	苔藓结皮影响干旱半干旱植被指数的稳定性
其他题名	Impact of Moss Soil Crust on Vegetation Indexes Interpretation
	房世波 1; 张新时 2
来源期刊	光谱学与光谱分析
ISSN	1000-0593
出版年	2011
卷号	31 期号:3 页码:780-783
中文摘要	植被指数是表征大尺度下陆地生态系统的最常用的,也是最重要的参数,所以得到准确的植被指数就显得至关重要.苔藓结皮在干旱半干旱区,极地和亚极地区分布广泛,且干,湿苔藓结皮光谱差异较大,这种差异在干湿交替频繁的干旱与半干旱区是否对区域植被指数产生影响.能产生多大的影响.国内外未见研究报道.该文以最常用的植被指数NDVI为例,重点分析了苔藓结皮干,湿变化能在多大程度上影响区域NDVI值.研究得出,100%盖度的湿苔藓结皮NDVI值(0.657)较干苔藓结皮NDVI值(0.320)提高0.337,比干苔藓结皮高1倍多,干,湿苔藓结皮NDVI值达到0.000水平差异显著;研究区苔藓结皮的平均盖度为12.25%,线性混合光谱模型分析得出,湿苔藓结皮较干苔藓结皮可以使研究区区域NDVI提高0.04(14.3%);由于苔藓结皮的存在和干旱半干旱区降雨的不稳定性,必然造成该区域短时间内NDVI变化的不稳定
英文摘要	Vegetation indexes were the most common and the most important parameters to characterizing large-scale terrestrial ecosystems. It is vital to get precise vegetation indexes for running land surface process models and computation of NPP change, moisture and heat fluxes over surface. Biological soil crusts(BSC) are widely distributed in arid and semi-arid, polar and sub-polar regions. The spectral characteristics of dry and wet BSCs were quite different, which could produce much higher vegetation indexes value for the wet BSC than for the dry BSC as reported. But no research was reported about whether the BSC would impact on regional vegetation indexes and how much dry and wet BSC had impact on regional vegetation indexes. In the present paper, the most common vegetation index NDVI were used to analyze how the moss soil crusts(MSC) dry and wet changes affect regional NDVI values. It was showed that 100% coverage of the wet MSC have a much higher NDVI value(0.657) than the dry MSC NDVI value (0.320), with increased 0.337.Dry and wet MSC NDVI value reached significant difference between the levels of 0.000.In the study area,MSC, which had the average coverage of 12.25%, would have a great contribution to the composition of vegetation index. Linear mixed model was employed to analyze how the NDVI would change in regional scale as wet MSC become dry MSC inversion. The impact of wet moss crust than the dry moss crust in the study area can make the regional NDVI increasing by 0.04(14.3%).Due to the MSC existence and rainfall variation in arid and semi-arid zones,it was bound to result in NDVI change instability in a short time in the region. For the wet MSC’s spectral reflectance curve is similar to those of the higher plants, misinterpretation of the vegetation dynamics could be more severe due to the "maximum value composite"(MVC) technique used to compose the global vegetation maps in the study of vegetation dynamics. The researches would be useful for detecting and mapping MSC from remote sensing imagery. It also is to the advantage to employing vegetation index wisely
中文关键词	生物土壤结皮 ; 苔藓结皮 ; 植被指数(NDVI) ; 遥感 ; 光谱
英文关键词	Biological soil crusts(BSC) Moss soil crusts(MSC) NDVI Remote sensing Spectroscopy
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:4159502
来源机构	中国科学院植物研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/226684
作者单位	1.中国气象科学研究院, 北京 100081, 中国; 2.中国科学院植物研究所, 北京 100093, 中国
推荐引用方式 GB/T 7714	房世波,张新时. 苔藓结皮影响干旱半干旱植被指数的稳定性[J]. 中国科学院植物研究所,2011,31(3):780-783.
APA	房世波,&张新时.(2011).苔藓结皮影响干旱半干旱植被指数的稳定性.光谱学与光谱分析,31(3),780-783.
MLA	房世波,et al."苔藓结皮影响干旱半干旱植被指数的稳定性".光谱学与光谱分析 31.3(2011):780-783.