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利用数码照相和处理技术,对黄土高原水蚀风蚀交错带小流域坡面表土砾石覆盖度和粒径分布进行了研究.实验结果表明:在陡坡坡面上,坡面中部砾石覆盖度最大;在缓坡坡面上,砾石覆盖度沿坡面呈总体降低趋势.砾石覆盖度与坡度之间存在正相关关系,砾石粒径沿坡面有总体降低的趋势,砾石粒径随坡度增加而降低.坡面砾石平均粒径介于6~20mm之间,粒径>50mm的砾石在坡面的数量很少.砾石在坡面不同部位的覆盖度与粒径<40mm砾石数量显著相关,2~50mm砾石面积占砾石总面积的60%以上,该粒径的砾石决定了坡面的砾石分布.
Using digital photography and processing technology, the gravel coverage and particle size distribution of the surface soil of the small watershed in the wind-water erosion crisscross region of the Loess Plateau were studied.The experimental results show that the gravel coverage is the highest on the steep slope surface, On the slope, the gravel coverage decreases along the slope, and there is a positive correlation between the gravel coverage and the slope, while the gravel diameter tends to decrease along the slope, and the gravel diameter decreases with the increase of the slope. The average size of gravel is between 6 ~ 20mm, the number of gravel> 50mm is very small, the coverage of gravel in different parts of slope is significantly related to the number of gravel <40mm, the area of 2 ~ 50mm gravel Accounting for more than 60% of the total gravel area, the size of the gravel determines the slope gravel distribution.