基于多时相遥感的喀斯特石漠化监测研究

Study on Monitoring of Karst Rock Desertification Using Multi-temporal Remote Sensing

石漠化是在热带亚热带暖温带湿润半湿润气候条件的喀斯特环境背景下,由于人类活动和自然因素,导致地表植被遭受破坏,土壤严重侵蚀,基岩裸露或砾石堆积,土地生产力严重下降,地表出现类似荒漠景观的土地退化过程和现象。从石漠化动态演变特征及其地学依据分析出发,依据石漠化动态演化信息,以黔东区域1999年和2006年的相近季相的TM/ETM+影像为数据源,采用多时相遥感变化检测方法,探讨基于动态特征的石漠化遥感监测方法。研究结论表明,基于动态信息的多时相遥感影像的石漠化遥感监测方法,有助于更科学地研究石漠化的变化规律,对石漠化的综合防治也具积极的作用。

Karst rocky desertification is an entity of evolution and landscape that mainly occurred against thebackground of the tropical, subtropical belt and warm temperature zone vegetation is destroyed, its mainphenomena can be summarized as follows： eroded seriously, bedrock and gravels are exposed, the landproductivity declines seriously, and at last the karst succeeds to desert liked landscapes under human activitiesand natural forces on the vulnerable environment of ecology and geology. Through analysis of the dynamicevolution and geosciences of karst rocky desertification, this paper took the east of Guizhou province as a studyarea in multi- temporal Landsat images of 1999 and 2006 to explore a monitoring method using changedetection based on dynamic characteristics. This study concluded that methods based on multi- temporalremote sensing contributed to a more scientific study of rocky desertification evolution and the relief of thedisaster.