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首页> 外文期刊>Journal of Science and Technology of Agriculture and Natural Resources >Variability of Surface Erosion and Particle Size Distribution in Relation to Slope Aspect and Gradient in a Semi-Arid Region in West of Zanjan
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Variability of Surface Erosion and Particle Size Distribution in Relation to Slope Aspect and Gradient in a Semi-Arid Region in West of Zanjan

机译：Zanjan西部半干旱地区表面侵蚀和粒度分布的变化与坡度和坡度的关系

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Soil erosion by surface runoff introduced as surface erosion is one of the main mechanisms of land degradation in the hill slopes. Slope characteristics including aspect and gradient can control the differences of soil properties along the hillslope. This study was conducted to investigate the effect of slope aspect and gradient on variations of some soil properties in the short slopes. Five hills including both north and south aspects with different gradients (9-10%, 13-16%, 17-22%, 29-31% and 33-37%) were considered in a semi-arid region with 30 ha in area, in the west of Zanjan, northwest of Iran. The hills were weakly covered with pasture vegetation covers. Soil samples were collected along the slopes from two depths (0-5 cm and 5-15 cm) in four positions with 2 m distance along each slope with two replications. A total of 160 soil samples were analyzed for particle size distribution (sand, silt and clay), gravel and bulk density. Surface erosion was determined based on the variation of grain size distribution and bulk density. Differences of the grain size distribution and surface erosion between the two slope aspects and among the slope gradients were analyzed using the Tukey test. No significant difference was found between slope aspects in surface soil erosion. Nevertheless, surface soil erosion was affected by slope gradient in each slope aspect (R~(2)= 0.78, p 0.05). Surface erosion in the north slopes was more dependent on the slope gradient, as compared to the corresponding south slopes. In the south slopes, surface erosion was affected by the movement of silt particles from soil surface, while in the north slopes, it was significantly affected by the loss of clay particles.
机译：作为地表侵蚀引入的地表径流对土壤的侵蚀是山坡土地退化的主要机理之一。坡度特征（包括坡度和坡度）可以控制沿山坡的土壤特性差异。本研究旨在研究坡度和坡度对短坡土壤某些性状变化的影响。在面积为30公顷的半干旱地区，考虑了包括南北两个坡度不同的五个丘陵（9-10％，13-16％，17-22％，29-31％和33-37％） ，位于伊朗西北部Zanjan的西部。丘陵覆盖着草木植被。沿两个深度（0-5 cm和5-15 cm）的两个深度沿斜坡收集土壤样品，每个斜坡沿每个斜坡2 m的距离进行两次重复。总共分析了160个土壤样品的粒度分布（沙，粉尘和粘土），砾石和堆积密度。表面侵蚀是根据晶粒尺寸分布和堆积密度的变化确定的。使用Tukey检验分析了两个坡度之间以及坡度梯度之间的晶粒尺寸分布和表面侵蚀差异。在表面土壤侵蚀的坡度方面没有发现显着差异。然而，表层土壤侵蚀在每个坡度方面都受到坡度的影响（R〜（2）= 0.78，p <0.05）。与相应的南坡相比，北坡的表面侵蚀更多地取决于坡度。在南坡，土壤侵蚀受到土壤表层淤泥颗粒运动的影响，而在北坡，则受到粘土颗粒流失的显着影响。

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