| Desertification has become a world-focus problem, and bush plants will play an un-replaced role in solving the desertification. Desertification is a very serious problem in Inner Mongolia, which has the largest area of desertification land there. In order to change the situation, correctly evaluation of the productive force should be made before the solution comes out.Based on the status from Dengkou County in Inner Mongolia, we got the forestry pictures and measurement of plants situation by air-view photography. And in 2006, we took nearly 130 photos of Wulangbuhe desert in Dengkou County by VirtuoZoNT system. There are 10 air-routes for GPS assistant three Dimension calculation and rectification. And we got a image for 1 square meters experimental zone at 1:1000 scale. With measuring the distribution and circus and height status for typical Nitraria tangtorum and Elaeagnus angustifolia, we took a research work to the plants in desert, by the photos from orthographic projection work and by the means of shadow-calculating. Biomass forecast model has been constructed with plant scale and plant height as the variable, after the data from air-view photos were analyzed.The result shows that,1) relative error would be 15% for measuring the desert plant by means of orthographic projection and shadow-calculating, which is basically enough for investigation to desert plant; 2) biomass in research zone was affected by the factors of plant scale plant height, and the models for Nitraria tangtorum is:W=-33.92+6.53E-4(D2H)-9.86E-10(D2H)2+7.05E-16(D2H)3, and the model for Elaeagnus angustifolia is W=0.0024(DH)1.0973; 3) the plant scale(D) and plant height(H) were used in the biomass model as the factors. |
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