通榆县西南部风蚀荒漠化土地动态变化分析
Dynamic change of wind erosion desertification land in southwest Tongyu County
[目的]风蚀是吉林省荒漠化土地主要类型之一,也是吉林省西部地区水土流失的主要原因之一,是造成土壤荒漠化的一种主要形式。通过研究2009-2019年 10年间研究区域风蚀土地面积及程度变化情况,为今后该区域荒漠化治理和生态环境保护提供依据。[方法]利用卫星遥感技术,采用地理信息系统(GIS)技术分析的方法,提取研究区域风蚀土地分布信息,并结合卫星定位系统实地地面调查,确定植被盖度、土壤质地和地表形态等为风蚀荒漠化土地现状程度评价指标,分析风蚀荒漠化土地各程度在面积上的组成比例,分析其转化方向及变化类型等,分析风蚀对荒漠化的影响。[结果]通榆县西南部 2009-2019 年 10 年间无极重度风蚀荒漠化土地。2019 年与 2014 年相比通榆县西南部风蚀荒漠化土地总面积减少了0.28km2,其中:轻度增加了 93.50km2,中度减少了88.58km2,重度减少了 5.20km2;2014年与2009 年相比通榆县西南部风蚀荒漠化土地总面积减少了 29.40km2,其中:轻度增加了 198.54km2,中度减少了 200.75km2,重度减少了 27.19km2。[结论]2009-2019 年 10 年间通榆县西南部风蚀荒漠化土地面积有着微量减少的趋势,中度风蚀土地面积大幅度减少,轻度风蚀土地面积逐年增加,重度风蚀土地面积小幅度减少,说明研究期间研究区风蚀荒漠化状况呈现持续好转的态势,程度稳步减轻,生态状况持续改善。
[Objective]Wind erosion is one of the main types of desertification land in Jilin province.It is also one of the main causes of soil erosion in the west of Jilin province.The change of area and degree of wind-eroded land in the study area from 2009 to 2019 was studied to provide basis for desertification control and eco-environmental protection in the future.[Method]Using satellite remote sensing and geographic information system(GIS)techniques,information on the distribution of wind erosion land in the study area was extracted and combined with Global Positioning System field surveys,to determine the vegetation coverage,soil texture and surface morphology as the evaluation indexes of the present degree of wind-eroded desertification land,and to analyze the proportion of different degrees of wind-eroded desertification land in the area,the transformation direction and change type were analyzed,and the influence of wind erosion on desertification was analyzed.[Result]In southwest Tongyu County,there was no extreme severe wind erosion in the 10 years from 2009 to 2019.Compared with 2014,the total area of wind-eroded desertification land in southwest Tongyu County decreased by 0.28 km2 in 2019,including a slight increase of 93.50 km2,a moderate decrease of 88.58 km2,and a severe decrease of 5.20 km2 Compared with 2009,the total area of wind-eroded desertification land in southwest Tongyu County decreased by 29.40 km2 in 2014,including a slight increase of 198.54 km2,a moderate decrease of 200.75 km2,and a severe decrease of 27.19 km2.[Conclusion]Between 2009 and 2019,there was a slight decrease in the area of wind-eroded desertification in southwest Tongyu County,with a significant decrease in the area of moderate wind-eroded land and an increase in the area of light wind-eroded land,the area of severe wind erosion land decreased slightly,which indicated that the situation of wind erosion desertification in the study area showed a continuous improvement during the study period.
孙宏刚;李杨;连方宇;贾志斌;孟得干;
吉林省林业勘察设计研究院,长春,130022;吉林省林业勘察设计研究院,长春,130022;吉林省林业勘察设计研究院,长春,130022;吉林省林业勘察设计研究院,长春,130022;吉林省林业勘察设计研究院,长春,130022;
wind erosion desertification dynamic changes
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