基于遥感的泾河流域植被覆盖格局分析

以MODIS遥感影像数据为数据源,应用遥感和GIS技术对泾河流域植被覆盖格局进行分析。结果表明:(1)泾河流域植被覆盖类型以退化草地和草地为主,二者占流域总面积的53.30%;地面覆盖程度较高的森林、疏林仅占流域总面积的9.83%,流域植被覆盖程度较低。(2)受自然环境条件和人类活动的影响,退化草地、稀疏灌丛、郁闭灌丛和疏林破碎化程度较为严重,对地面覆盖程度最低的退化草地除集中分布于流域北部外,主要零散分布于流域中、南部,其斑块形状复杂多样,数量最多,应成为流域植被恢复的重点。(3)各植被覆盖类型的斑快数量组成以小斑块所占比例最大,最小斑块比率均在50.0%以上;森林的斑块面积多样性最大,草地的斑块面积多样性最小。

Remote-sensing-based analysis of vegetation cover pattern in Jinghe Basin

Accurate and rapid monitoring of vegetation coverage is a key factor in restoring and building of ecosystems.Based on MODIS remote-sensing images,the paper analyzed and evaluated vegetation coverage of the Jinghe basin from viewpoint of landscape ecology with the aid of RS and GIS technologies.The results show:(1)degraded grassland and grassland were the main type of vegetation cover in the basin,accounting for 53.30% of the basin area,and degraded grassland accounted for 23.80% of the total area. Forests and sparse forests which provide the highest land cover only accounted for 9.83% of the basin area,suggesting that the vegetation cover of the base was very low;(2) affected by natural environment conditions and human activities the degraded grassland,sparse shrubs,dense shrubs and sparse forest were all distributed in small patches,and the degraded grasslands,providing the lowest land cover,were mainly distributed in the northern part and scattered in the central and southern parts of the basin.Its patches were highest in number and varied in shape.It should be of the first priority for vegetation restoration;(3) small patches dominated all the types of vegetation cover.Patches of forestland varied the most while those of grassland the least.