Correlation analysis of the biomass of the tropical forest vegetation, meteorological data and topographical data
Received date: 2004-06-28
Revised date: 2004-10-22
Online published: 2005-06-15
This paper analyses the correlations between the biomass of the tropical forest vegetation and LANDSAT TM data, meteorological data and topographical data taking Xishuangbanna of China's Yunnan province as an example. It includes four steps. Firstly, the biomass for each forest sample is calculated by using the field inventory data of each sample. GIS Database is established according to the coordinate of each forest sample. Secondly, the LANDSAT TM images are geometrically corrected by using topographic maps. The derivative data are derived from the LANDSAT TM images by using principal component analysis, tasseled cap transform and vegetation index analysis. Thirdly, the data including Landsat TM data and its derivative data, the topographical data such as DEM and aspect, and the climatic data such as annual mean temperature, annual average accumulative temperature above zero degree, annual average precipitation and humidity are referenced to the same projection and coordination, and interpolated as the grid data with a resolution of 30 m. The Landsat TM data and its derivative data, the topographical data and the climatic data for the samples are achieved by overlay analysis. Finally, the correlation between the LANDSAT TM and its derived data, meteorological data, topographical data and the biomass are analyzed. It is shown that the biomass of the tropical forest vegetation is most obviously correlated with annual average precipitation and the second principal component of the principal component analysis of LANDSAT TM at 0.01 confident level. The correlation coefficients are respectively 0.308 and -0.231. The biomass is obviously correlated with spectral index VI3, Landsat TM5, spectral index such as brightness and humidity of the Tasscap transform, the first principal component at 0.05 confident level. The correlation coefficients are respectively 0.308, -0.231, 0.203 and -0.201.
YANG Cun-jian, LIU Ji-yuan, HUANG He, XU Hui-xi, DANG Cheng-lin . Correlation analysis of the biomass of the tropical forest vegetation, meteorological data and topographical data[J]. GEOGRAPHICAL RESEARCH, 2005 , 24(3) : 473 -479 . DOI: 10.11821/yj2005030016
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