Abstract: 【Objective】 For the sparse distribution of Haloxylon ammodendron and Tamarix ramosissima in arid and semi-arid regions, it is difficult to carry out ground survey in large-scale. The combination of ground remote sensing and space remote sensing with vegetation index (VI) can survey them rapidly, but in this process, it is necessary to clarify the difference of vegetation index in data.【Method】 NDVI, RDVI and SAVI of H. ammodendron and Tamarix ramosissima. were studied and compared by using hyperspectral data and optical image in desert forest.【Result】 The results showed that the values and trends of the three kinds VI of H. ammodendron and Tamarix ramosissima were similar, especially SAVI and RDVI, but the change of NDVI was larger than that of the other twos. In the optical image VI, the NDVI and SAVI of H. ammodendron and Tamarix ramosissima were kept in a certain range, and the variation range was small, while the values and trends of RDVI were relatively large and unstable.【Conclusion】 The NDVI and SAVI extracted from the hyperspectral data were larger than those of the optical images, while the RDVI extracted from the optical images was larger than the hyperspectral data,therefore, RDVI was more sensitive to vegetation coverage.

Key words: desert forest; hyperspectral data; optical image; vegetation index (VI)

中图分类号: 

• S712