摘要
以安塞县为例,应用G IS技术,探讨坡度、植被覆盖度计算方法及土壤侵蚀评价工作程序与作业方式的改进。结果表明:对基于50 m分辨率DEM提取的坡度进行尺度变换对坡度计算结果影响很大,而进行尺度变换后的改进方法,98%的地区坡度值呈不同程度的增大,平均坡度增大14.5°,陡坡面积增大,缓坡面积减小,结果更加附合实际情况;相比现行植被覆盖度计算方法,采用改进植被覆盖度计算方法计算的植被覆盖度结果减小,平均植被覆盖度减小11.8%;采用AML编程方式实现计算机自动化土壤侵蚀评价,过程可重复性强,结果更加客观、合理。
This article inquired into talked about the improvements in calculating slope gradient,vegetation coverage and the working processes and working styles for soil erosion assessment,taking the Ansai County as an example.The results showed that： There were great change in slope gradient after re-scaling of slope gradient calculated from DEM with 50m resolution.Slope gradient in 98% of the studied area became larger with a varied extent.Mean slope gradient in the studied area increased by 14.5°.There was an increase in steep areas and a decrease in flat areas.The results of the slope gradient calculated were much more near the practical.The result of vegetation coverage calculated dy the improved method was smaller compared with the method by current method.Based on the improved method,the average of vegetation coverage decreased by 11.8%.Soil erosion assessment was calculated by computer automatically by the AML program.The assessment process was easy to repeat and the result was more impersonal and reasonable.
出处
《中国水土保持科学》
CSCD
2010年第3期1-7,共7页
Science of Soil and Water Conservation
基金
国家"973"重点基础研究发展计划项目"中国主要水蚀区土壤侵蚀过程与调控研究"(2007CB407204)
黄委会项目"水土流失经验模型指标体系及孤山川流域年产沙经验模型研究"(黄200651-08)
黄土高原土壤侵蚀与旱地农业国家重点实验室基金(10501-201)
关键词
土壤侵蚀强度等级
GIS
坡度
植被覆盖度
安塞县
soil erosion intensity grade
GIS
slope gradient
vegetation coverage
Ansai County
