摘要
利用GIS的空间分析功能,以年度遥感影像作为信息源,依靠目视判读、实地调查建立解译标志库,提取2014年和2019年洞庭湖区沙化土地数据。结合实地调查资料分析洞庭湖区沙化土地的空间动态变化情况。结果表明:洞庭湖区2014~2019年间土地沙化情况整体较为稳定,有向好趋势,沙化土地面积减少205.23 hm^(2),流动沙地明显减少,多数转化为固定沙地、半固定沙地;沙化土地植被综合覆盖度有所提升,极重度沙化土地明显减少,但局部地区沙化程度有所加剧。地方政府在研究期内采取的一系列退林还湿、拆除矮围等措施显著遏制土地沙化扩散,但是局部地区沙化土地程度的加剧表明沙化土地的植被修复刻不容缓。
The spatial analysis function of GIS technology,and remote sensing images as the main information source were used,visual interpretation and field investigation was relied on,the understanding and translation mark database was established to extract the desertification land data of Dongting Lake area in 2014 and 2019.Combined with the field survey data,the dynamic changes of sandy land in the study area were analyzed.The results showed that the land desertification in Dongting Lake area was relatively stable and had a good trend from 2014 to 2019.The area of desertification land decreased by 205.23 hm2,the mobile sandy land decreased significantly,and most of them were transformed into fixed sandy land and semi fixed sandy land.The comprehensive vegetation coverage of sandy land had been improved,the extremely severe sandy land had been significantly reduced.However,the degree of desertification in some areas had intensified.A series of measures taken by the local government during the study period,such as returning forests to humidity and removing low enclosures,have significantly curbed the spread of land desertification,but the aggravation of the degree of sandy land in some areas shows that the vegetation restoration of sandy land is urgent.
作者
龙京
彭海
兰竹
夏诗禹
沈生涛
杨佳伟
Long Jing;Peng Hai;Lan Zhu;Xia Shiyu;Shen Shengtao;Yang Jiawei(Hunan Prospecting Design&Research General Institute for Agriculture Forestry&Industry,Changsha 410007;Hubei Academy of Forestry,Wuhan 430075)
出处
《湖北林业科技》
2022年第3期32-37,共6页
Hubei Forestry Science and Technology
基金
第六次全国荒漠化和沙化监测湖南省沙化监测项目(2019L-306)。
关键词
沙化土地
洞庭湖
空间分布
动态分析
沙化程度
desertified land
Dongting Lake
spatial distribution
dynamic change
desertification degree
