Remote Sensing Analysis on Desertification in Hulun Beier Grassland
- Issue 1, Pages: 11-18(1987)
Published:1987
DOI: 10.11834/jrs.1987002
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Published:1987
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<正> 呼伦贝尔草原是我国自然条件最好
牧草单位面积产量最高的草原
是我国重要的畜牧业生产基地。但在生产发展的过程中
由于人们没有合理地利用自然
过度放牧或开垦
造成了草场沙化。据调查
1975年呼伦贝尔盟(以下简称呼盟)大兴安岭以西牧业四旗沙化草场面积共1311.5万亩
占天然草场总面积的12.4%
牧区草原载畜量比五十年
In this study
the MSS images taken in 1975
1978 and 1983 were interpreted through appling geographical and optical methods
the choise of the projects of the combination of non-standard pseudo colors and the pseudo colourization of numbered phase picture produced by grating. Ac-coding to the calculation
the area of seriously desertificated pastures is about 352
000 ha.
it is 5% of the natural pastures in Hulun Beier Grassland; the area of moderately desertificated pastures is about 1
085
866.7 ha.
it is 15.4%; the area of slightly desertificated pastures is about 1
021
333.3 ha.
it is 14.4%.The windy weather and abundent sandy materials constituted the potentialities of desertification in this area
the destructive activities on vegetation during the utilizing of grassland is the main causal force of desertification.In the process of stepwise regression
statistical significance being 0.01
the strength of wind
the content of clay and organic matter in soil and the annual precipitation are not dominant. The relationship between desertificated degree and the coverage of grass is as follows T = 0.07568 + 0.00810V R=0.731where T = content of sand (0.005-0.1) in A/content of sand (0.005-0.01) in ABV = coverage of grassFrom this formula
critical coverage of grass for various degrees of desertification can be derived. The grassland may be prevented from desertification if the coverage of grass is kept above 77%
moderately and seriously desertification may occur within 52%-40% and below 40% respectively. So it is important to protect the vegetation in order to prevent grassland from desertification.
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