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Mapping the dynamic degree of aeolian desertification in the Shiyang River Basin from 1975 to 2010

Research in Cold and Arid Regions 2020年第3期12卷 144-153页

作者： Jie Liao Tao Wang ShaoXiu Ma Jian Guo Key Laboratory of Desert and Desertification Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhouGansu 730000China Drylands Salinization Research Station Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhouGansu 730000China Lanzhou Branch Chinese Academy of SciencesLanzhouGansu 730000China

The Shiyang River Basin is an area of China that is severly affected by aeolian ***,we established an aeolian desertified land classification system for visual interpretation,which classified the Aeolian Desertified Land(ADL)into Slight(SL),Moderate(M),Severe(S)and Extremely Severe(ES)according to the *** of Landsat series(acquired in 1975,1990,2000 and 2010)were employed to monitor the status,trend and spatial pattern of aeolian desertification,especially to map the overall spatial pattern of ADL dynamics by proposing a new dynamic Index(DI)in the Shiyang River Basin from 1975 to *** results show a generally decreasing trend from 1975 to ***,the ES ADL kept increasing throughout the whole study ***,the area of ADLs with different severity increased with increasing severity,this S and ES ADLs dominated characteristics of aeolian desertification was contrary to those sandy lands in eastern China where was dominated by SL and M *** the three sub-periods of 1975−1990,1990−2000 and 2000−2010,the first two were the restoration stage,while the last one was the expansion stage of aeolian ***,all these new ADLs occurred in Minqin County during 2000−2010,indicating a detrimental increase of aeolian desertification in Minqin,and the concentration of ADLs toward the lower reaches of the Shiyang River *** DI works well to identify areas with desertification changes no matter the ***,DI results disclosed a stable status of aeolian desertification,and the DI decreased with increasing ADL *** results indicate that it will be difficult to control the expansion of aeolian desertification in Minqin County over an extended period of ***,we suggest effective and long-lasting aeolian desertification control programs in the Shiyang River Basin,especially in Minqin,and SL and MADLs should have priority in facilitating a quick reversal of aeolian desertification.

关键词： aeolian desertification dynamic degree Shiyang River Basin Minqin

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RESEARCH ON dynamic CHANGE OF GRASSLAND IN WEST JILIN PROVINCE BASED ON 3S TECHNOLOGY

RESEARCH ON DYNAMIC CHANGE OF GRASSLAND IN WEST JILIN PROVIN...

引用

Computer and Computing Technologies in Agriculture——First IFIP TC 12 International Conference(CCTA2007) Volume I

作者： Zhiming Liu Nanyan Ling Northeast Normal University

Grassland had been interpreted with the method that combined supervised and non-supervised classifications using Landsat data in autumns 1986,1996 *** amelioration of algorithm promoted the *** the support of RS and GIS,spatial information of grassland landscape in west Jilin province from 1986 to 2000 was extracted,spatio-temporal dynamics of grassland and change of grassland landscape patterns were *** results show:1)The grassland environment in the west Jilin is exacerbating and the area of grassland is decreasing by an average of 4.5×10 hectares a year,moreover,the grassland degeneration is severe and the area of degeneration is 81.1%of the total.2) The degeneration of the grassland is heavier and the proportions of moderate and heavy degenerated grassland are heightening obviously,so their evaluative trends are remarkable.3) The degenerated grassland is mainly converted into cropland and saline—alkalized land,converted area reaches 992351.4hm and 563031.1hm.4)The total dynamic degree of grassland is a minus *** 1986-1996,high coverage grassland has a strong effect on change of whole *** fastest degraded area is low coverage grassland from 1996 to 2000.

关键词： grassland spatio-temporal change dynamic degree remote sensing images geography information system west Jilin province

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