基于RS和GIS的赣西地区土壤侵蚀分布特性研究

Research on the Characteristics of Soil Erosion in Western Jiangxi Based on RS and GIS

本文利用RS和GIS技术,采用1999-2014年的4期遥感影像数据作为主要数据源进行解译,并结合RUSLE模型,在GIS环境下,求算赣西地区的土壤侵蚀模数,并分析其时空分布特性。研究表明:(1)从强度分布上看,赣西地区土壤侵蚀程度不高,以微度侵蚀和轻度侵蚀为主,属于土壤侵蚀不敏感地区;(2)从空间分布上看,强烈以上侵蚀主要发生在地势比较复杂的北部九岭山脉及西南部罗霄山脉(明月山、武功山)或开发地及滩涂等靠近水源且较为平缓地带,应是侵蚀作用与不同土地利用方式有关,即人为因素会造成这些地区植被覆盖较少且无防护措施有关;(3)从时间变化上看,该地区土壤侵蚀分布,虽然不同时期有一些波动,但无明显变化,说明该地区土壤侵蚀灾害从2000年到2014年间,没有发生恶化现象,进一步说明该地区生态环境保护在土壤侵蚀防治方面总体上做得不错,同时应加强在城市建设与各类资源开发中的生态环境保护。

The 4 periods RS images data as main data source were used to interpolate using RS and GIS technologies. With RUSLE model in the GIS software environment,the modulus of soil erosion in the western Jiangxi were calculated,as well as the spatial and temporal characteristics were analyzed for the area. This research indicates:( 1) From the distribution of intensity,the soil erosion was not severe in the western Jiangxi,mainly as slighter erosion level and slight erosion level;( 2) From the spatial distribution,soil erosion was severe in the complicated terrain area just as in the Jiuling Mountain and Louxiao Mountain,or in the developing districts,shoal,etc.,due to the less vegetation because of the effect of soil erosion or human factors with no protect measure.( 3) From the temporal distribution,soil erosion although had some slow motion,but not in evidence. This indicated that the erosion in this area from 2000 to 2014,had no worse in evidence and,the protecting measurement was executed well for the protection of ecological environment,but more protecting measurements were needed during the developing in urbans.