Relationship between surface dryness degree and landuse types based on TVDI on Loess Plateau
Received date: 2005-11-14
Revised date: 2006-03-30
Online published: 2006-10-15
Vegetation coverage and surface temperature(Ts) are important parameters to describe characters of land covers.More useful information will be created by integrated analyses of these two kinds of data together,which will help us to find out main principles of the temporal and spatial variation of surface soil moisture.The present paper aims at demonstrating how Terra/MODIS data may be used to estimate spatial patterns of soil moisture,a key variable in distributed hydrological models.The basic approach is to interpret the so-called Ts/NDVI space in terms of surface soil moisture status.To understand the relationship between them and landuse types on the Loess Plateau,a simplified land surface dryness index(Temperature Vegetation Dryness Index,TVDI) based on an empirical parameterization of the relationship between surface temperature and vegetation index is suggested. Based on examination of Terra/MODIS image of the Loess Plateau,acquired in September,2003,NDVI(MOD11) and Ts(MOD13) are investigated as an alternative indicator of vegetation abundance and land surface temperature.Based on Landsat Enhanced Thematic Mapper Plus(ETM+) image,the landscape classification map is conducted on supervised classification and interactive modification.To examine soil moisture conditions at the surface,TVDI is conducted with Ts and NDVI. Then,we evaluate change of TVDI under different landuse types formed by both natural and human activities.First,TVDI was divided into 10 levels to describe the spatial variability of surface soil moisture on the Loess Plateau.Second, we evaluated the water-holding capacity of each landuse type to different dryness degrees. The results are as follows:(1) Based on satellite derived information only, TVDI is conceptually and computationally straightforward,and the potential for operational application of the index is therefore large.(2)The spatial variation in TVDI reflects the variation in moisture on a finer scale than can be derived from the hydrological model in this case.(3)It can be inferred that the water-holding capacity in forestland and sparse woodland is better than farmland and grassland in relatively wet condition,and grassland is better than forestland and sparse woodland in relatively dry condition.(4) From the aspect of vegetative restoration on the Loess Plateau,according to variability of water-holding capacity in different landuse types,it could be suggested that increasing forestland and sparse woodland area in relatively wet region,increasing grassland area and reducing land reclamation in dry region can promote the process of ecological pattern optimization.
Key words： TVDI; landuse type; Loess Plateau
LI Zheng-guo,WANG Yang-lin,WU Jian-sheng, CHANG Hsiao-fei . Relationship between surface dryness degree and landuse types based on TVDI on Loess Plateau[J]. GEOGRAPHICAL RESEARCH, 2006 , 25(5) : 913 -920 . DOI: 10.11821/yj2006050017
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