偃师区不同坡度带植被覆盖度分布研究

Study on vegetation coverage distribution of different slope belts in Yanshi district

为了探寻坡度分布与植被覆盖度的关系,通过Landsat 8和DEM提取了偃师区坡度与植被覆盖度信息,分析二者之间的关系。结果表明,偃师区坡度较缓、植被覆盖状况良好,适宜人类居住、生活;植被覆盖度分布受2°、6°、15°、25°坡度影响较大,在≤15°坡度范围内10%~30%植被覆盖度占总面积的比重最大,但2°~6°带内60%~80%植被覆盖度占总面积比重最大,6°~15°带内>80%植被覆盖度占比最大;坡度超过15°后60%~80%、>80%植被覆盖度占总面积的比重占据优势地位,坡度超过25°后,>80%植被覆盖度所占比重又超过60%~80%的植被覆盖度,居于领先地位;>80%、60%~80%植被覆盖度随着坡度的增加呈先减少再增加而后逐渐减少的趋势,45%~60%、30%~45%、10%~30%、<10%植被覆盖度分布则是随着坡度的增加逐渐减少。偃师区生态清洁小流域建设成效显著,植被覆盖状况大幅增加,治理经验值得推广、借鉴。

In order to explore the relationship between slope distribution and vegetation coverage,the information of slope and vegetation coverage in Yanshi district were extracted by Landsat 8 image and DEM,and their relationship were analyzed.The results showed that the slope of the district was gentle with good vegetation coverage,which was suitable for human habitation and life;The vegetation coverage distribution was greatly affected by slopes of 2°,6°,15°and 25°.When the slope was no more than 15°,the coverage between 10% to 30% accounted for the largest proportion of the total area,but in the slope zone from 2°to 6°,the coverage between 60% to 80% accounted for the largest proportion of the total area,and in the slope zone from 6°to 15°,the coverage above 80% accounted for the largest proportion;After the slope exceeded 15°,the coverage between 60% to 80% and beyond 80% occupied dominant position;After the slope exceeded 25°,above 80% coverage occupied dominant position exceeding the coverage from 60% to 80%;The coverage beyond 80%,from 60%to 80% showed same trend that first decreasing,then increasing and then gradually decreasing with slope increase,while coverage distributions from 45% to 60%,30% to 45%,10% to 30% and lower 10% gradually decreased with slope increase.There are remarkable results in ecological and clean small watershed construction for Yanshi district,and the vegetation coverage has increased greatly,the experience is worth popularizing and learning.