遥感技术在荒漠化滥测中的应用──以陕西榆林市芹河乡为例

阐述了利用航片及精处理过的ＴＭ影像编制１∶１０万陕西省榆林市芹河乡土地荒漠化分布图的方法及过程。１９６０年及１９８７年分布图的定量分析比较表明，该乡荒漠化现象在东部经过治理得到了抑制，而原先多为植被覆盖的西部则出现了耕地、牧地退化成沙地。２７年间全乡林地增加了１３．１３ｋｍ２，沙地、耕地及牧地分别减少了７．１８ｋｍ２、１．０３ｋｍ２和５．９８ｋｍ２，结果表明建造防护林是治沙的有效途径。

APPLICATION OF REMOTE SENSING TECHNOLOGY ON DESERTIFICATION DYNAMICS: A CASE STUDY IN YULIN CITY, SHAANXI PROVINCE

The methodology to generate desertification distribution maps from black and white, color infrared aerial photographs and a geometrically rectified TM image is described. The comparison of two maps of Qinhe township, Yulin City, Shaanxi Province in 1960 and 1987 reveals that there is a decreased desertified land scope on the eastern part of the study area where was ever affected by desertification severely and a increased desertified landscope in the western part where was mostly covered by vegetation.But in the whole twonship, the woodland has expanded by 13.13 km 2, and the desertified area has reduced by 7 18 km 2. The results show that planting trees and shrubs is the effective way for combating desertification.