Studies On Grassland Resource And Landscape Ecological Information Based On The 3S Technologies

This paper made a study on the grassland types and the landscape of San Jiaocheng sheep breeding farm of Qing Hai province by RS and GIS. The content included the analysis on the image of the remote sensing, the modeling of the geographic database, the characters of the spectrum of the grasslands and the investigation of the grassland resource, results showed that:1. An analysis on each band of the ETM image was made, result showed that band 1, 2 and 3 were related to each other greatly, band 4, 5 and 7 were only related in some extent. The spectral curves of different grasslands changed greatly near band 7, 5, 4 and 3, which could be infered that these bands could be used in the classification of the grasslands. The type of grassland changed with the changing of the topographic factor in a regular order, based on the theory, this experiment used the DEM assistanted with the distribution of the ecological sequence of the grassland, combined with the characters of the spectrum of the RS to plot out the grasslands, which provided a possible way to solve the problem that it was difficult to plot out different grasslands because of the overlapping of the spectrum.2. With the changing of the coverage of the vegetation, the sensitivity of RVI and NDVI to the productivity of the grassland and the growing status of the vegetation was different. The calculous mathematics was adopted to break up the whole into parts to compute the linear equation between the vegetation index and the productivity according to different ranges of coverage, results showed that the relativity between the mathematical model and the real productivity of the grassland had become better than anyother methods ever used.3. A study on the coupling action was made about the landscape ecology of the San Jiaocheng sheep breeding farm, the result showed that the coupling action between the alp meadow and the mountains meadow was direct, it was same to the mountains meadow and the mountains campo, while it was indirect between the alp meadow and the mountains campo and the coupling action of them needed the medium of the roads or water system, or the indirect action of the herding behavior of the livestocks. The number of the grassland types in the mountains campo was more than that in any others', and it was same to the naked spot. The coverage and the productivity of the grassland were lower, which means that the grassland in the mountains campo was in the stage of degeneration. The coupling of the system could be divied into natural coupling and artificial coupling, at the same time, the natural coupling was the base of the artificial coupling, and the improvement of the ecological productivity of the system depended on the optimized process of the aritificial coupling.