CAJ | 학술논문

以多期遥感图像为基本数据，借助3s技术，探讨了奇台绿洲的植被覆盖动态变化。结果表明，虽然弃耕面积与开荒面积之比从前期（1986～1997年）的7．56降为后期（1997-2005）的1．86，但植被覆盖类型的变化始终以开荒为主，大量非耕地转化为耕地。耕地面积由早期占总面积的11．74％增加到后期的40．15％。前期植被恢复面积是退化面积的130．13％，后期仅为37．5％。同时，荒漠转化为低草的比例较前期少，而低草转化为荒漠的比例增加，表明荒漠在不断扩大，反映出绿洲生态环境趋差。人类大面积开垦农田使用了大量的水资源，使得地下水位下降，荒漠边缘依靠地下水生存的低草枯萎，并转化为荒漠。这是导致后一时期绿洲生态环境恶化的决定性因素。
이다기요감도상위기본수거，차조3s기술，탐토료기태록주적식피복개동태변화。결과표명，수연기경면적여개황면적지비종전기（1986～1997년）적7．56강위후기（1997-2005）적1．86，단식피복개류형적변화시종이개황위주，대량비경지전화위경지。경지면적유조기점총면적적11．74％증가도후기적40．15％。전기식피회복면적시퇴화면적적130．13％，후기부위37．5％。동시，황막전화위저초적비례교전기소，이저초전화위황막적비례증가，표명황막재불단확대，반영출록주생태배경추차。인류대면적개은농전사용료대량적수자원，사득지하수위하강，황막변연의고지하수생존적저초고위，병전화위황막。저시도치후일시기록주생태배경악화적결정성인소。
This article is in virtue of 3S technology, which research dynamic change and drive mechanism of Qitai vegetation coverage. The result indicates that all kinds of meadow are assarted to cropland continuously in the whole studying time. Although the ratio of the area of abandoning cropland to the area of assart reduced from 7.56（1986- 1997） to 1.86（1997-2005）, the most change of the kind of vegetation coverage is for assart, a great lot of no cropland is transformed intQ cropland. The ratio of the area of cropland to the total area increase from 11.74% in previous period to 40.15% in latter period. On the one hand, assart make the amounts of high grass and middle grass which have good environmental value decrease. On the other hand, abandoning cropland makes the amounts of low grass and desert increase. Increase in cropland used a great lot of water, make water table down, low grass which makes a living with groundwater wither away, and transform into desert. In previous period the ratio of area of renewing vegetation coverage to area of degenerating vegetation coverage is 130.13%, which reflect the progress of environment is good, and that is good for continual development. In the latter period the ratio of area of renewing vegetation coverage to area of degenerating vegetation coverage is 37.5%, the area of abandoning cropland is one times than the former. At the same time the ratio of the area of desert to the area of low grass is low, and the ratio of the area of low grass to the area of desert is high, that indicate the area of desert is increasing continually. The increase of the area of abandoning cropland and desert undoubtedly make environment and the stability of oasis which has worsened. Dimensional change of cropland is the definitive factor of the environment of oasis which has worsened, also is main drive of other kinds of vegetation coverage which changed.