GEOGRAPHICAL RESEARCH ›› 2009, Vol. 28 ›› Issue (1): 10-19.doi: 10.11821/yj2009010003

• Geo-information Science • Previous Articles     Next Articles

The spatial pattern and differentiation of NDVI in Mongolia Plateau

ZHANG Xue-yan1,2, HU Yun-feng1, ZHUANG Da-fang1, QI Yong-qing1   

  1. 1. Institute of Geographic Science and National Resources Research, CAS, Beijing 100101, China;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2007-11-24 Revised:2008-06-25 Online:2009-01-25 Published:2009-01-25
  • Supported by:

    国家自然科学基金(40571130, 40701150);中国科学院国际合作重点项目(GJHZ06);中国科学院科学数据库(INF105-SDB-A3);中国科学院地理科学与资源研究所所长基金(06W60001SZ);中国科学院陆地水循环及地表过程重点实验室开放基金(WL2005001)

Abstract:

It is a key step to deepen the understandings about the structure, functions and processes of regional resources and environment by using spatial, quantitative, multi-scale and temporal analysis, and there are many obvious advantages to study on the spatial pattern, spatial difference and the related ecological & environment characteristics by using remote sensing technology. As an independent geographic and ecological unit, the status of Mongolia Plateau ecology system and its changes have great effects on the environment of North China and even the whole East Asia, which makes it necessary to develop certain research works in the whole Mongolia Plateau in both theory aspect and practice aspect. In this study, based on GIMMS NDVI dataset of 1982-2003, the new Mongolia Plateau NDVI Dataset using MVC method was constructed and the stability in the time scale was also assessed. Then three spatial statistic methods including Moran coefficient, semi variance function and fractal analysis, were selected to investigate the spatial pattern and spatial differentiation of NDVI in Mongolia Plateau. The results show that: (1) The NDVI in Mongolia Plateau shows positive spatial autocorrelation in the whole region and similar NDVI are apt to aggregate together, which means the vegetation cover of Mongolia Plateau is generally intact and little fragmental. The NDVI distribution pattern is indeed clear; (2) In spite of the effects of both structural factors and random factors, the spatial distribution pattern of NDVI in Mongolia Plateau is mainly controlled by the structural factors which induce 88.7% of the total spatial variations, while only 11.3% of the total spatial variations is induced by the random factors; (3) There exists a clear anisotropy about NDVI distribution pattern in Mongolia Plateau, and there are higher spatial autocorrelation in the Northwest-Southeast direction which means those points with similar NDVI value are mainly distributed along Northwest-Southeast direction. Generally, the radius of NDVI patch is about 1178km, and the length-width ratio of those patches is about 2.4. According to the research, temporal NDVI study based on spatial statistics method could not only explore the NDVI spatial pattern & spatial difference but also indicate the geographic essences of NDVI and the relevant spatial statistics parameters.

Key words: GIMMS NDVI, Mongolia Plateau, spatial pattern, spatial differentiation, spatial statistic