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Journal of Arid Land  2012, Vol. 4 Issue (4): 450-456    DOI: 10.3724/SP.J.1227.2012.00450
Research Articles     
Influences of landform as a confounding variable on SOM-NDVI association in semiarid Ordos Plateau
YanYun LUO1, TingXi LIU1, XiXi WANG1,2, LiMin DUAN1
1 College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China;
2 Hydraulics/Water Resources Laboratory, Department of Civil and Environmental Engineering, Old Dominion University, Norfolk, VA 23529-0241, USA
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Abstract  Soil organic matter (SOM) plays an important role in maintaining vegetation cover and thus mitigating land erosion of fragile terrestrial ecosystems such as in the Northern Ordos Plateau of China (NOPC). However, little information is available on whether and how SOM varies spatially as an intrinsic characteristic of landform in NOPC. The objective of this study was to examine the spatial associations of SOM with landform and vegetation cover. The study was conducted in a 23,000-km2 area within NOPC because this area has landforms of mobile dunes (MD), flat dunes (FD), grassy sandy land (GSL), flat sandy bedrocks (FSB), and swamps and salt lakes (SW), which are typical landforms in semiarid ecosystems. SOM was determined using a standard laboratory analysis method for 5 cm topsoil samples collected at 72 locations across the study area. In addition, the 250 m Multitem-poral Moderate Resolution Imaging Spectroradiometer (MODIS) imageries taken in the period from August 2006 to August 2010 were used to extract Normalized Difference Vegetation Index (NDVI) which in turn was used as the surrogate of vegetation cover. Classic and geostatistical methods were used to compare SOM concentration across different landforms. The results indicated that an area with a greater value for NDVI (i.e. better vegetation cover) tended to have a higher SOM concentration regardless of the landform types. However, the association between SOM and NDVI varied from one landform to another. The SW and GSL had a highest SOM concentration, while MD had a lowest concentration. For the study area as a whole and the FD, GSL, and MD, SOM was found to be the sole function of NDVI, whereas, for the FSB, SOM was influenced by several intrinsic variables, namely ground surface altitude, slope, and aspect, as well as NDVI. SOM for the SW landform was found to be a function of NDVI. Furthermore, SOM and NDVI exhibited a consistent spatial pattern of increasing from north to south and from west to east. The highest SOM concentration of 3.5% occurred along an east-westward belt, which is adjacent to water pathways, in the mid part of the study area.

Key wordsoptimal partitioning      allometric biomass partitioning      limited resources      biomass allocation      allometric relationships     
Received: 02 April 2012      Published: 15 December 2012
Fund:  

The National Natural Science Foundation of China (51139002 and 51069005), the Inner Mongolia Agricultural University Innovation Team Building Program (NDTD 2010-6), the Inner Mongolia Scientific and Technology Bureau (20090516), and the Chinese Ministry of Science and Technology (2010DFA71460).

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Cite this article:

YanYun LUO, TingXi LIU, XiXi WANG, LiMin DUAN. Influences of landform as a confounding variable on SOM-NDVI association in semiarid Ordos Plateau. Journal of Arid Land, 2012, 4(4): 450-456.

URL:

http://jal.xjegi.com/10.3724/SP.J.1227.2012.00450     OR     http://jal.xjegi.com/Y2012/V4/I4/450

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