The study of soil erosion is significant to soil and water conservation and ecological construction planning. CA, a dynamic modeling method, has been widely used to simulate the future changes of soil erosion intensity. In this study, three slopes with different vegetation patterns (uniform distribution, aggregated distribution, and random distribution) and a bare slope in the Baojiagou watershed in the Pisha sandstone area were taken as the study objects. Based on the soil erosion intensity grade maps of slopes with different vegetation patterns under the three periods of rainfall, the soil erosion intensity grade maps of the four slopes were simulated by combining multi-criteria evaluation (MCE) and Markov chain (CA-Markov). Through tests, the Kappa coefficients of the simulated maps of uniform distribution, random distribution, aggregated distribution and a bare slope reached 80.15%, 75.41%, 75.92% and 76.48%, respectively. The results revealed that the soil erosion types on slopes with different vegetation patterns were transferred differently, and fewer erosion areas were generally transferred into highly eroded ones, with moderately and slightly eroded areas as the main transfer flows. After simulating the grade map of soil erosion intensity on slopes with different vegetation patterns, it was found that the slopes with uniform and random vegetation distribution primary displayed the transfer from highly eroded areas to less eroded ones, and the sedimentary area was enlarged, while the slope with aggregated vegetation distribution and the bare slope mainly presented the transfer from less eroded areas to highly eroded ones. The sedimentary area was diminished. Therefore, compared with the bare slope, the slopes with uniform and random vegetation distribution exerted a better inhibitory effect on the soil erosion degree of hydraulically eroded slopes, and the inhibitory effect of aggregated vegetation distribution-type slope was the weakest. The study results provide critical information for planning and implementing soil conservation measures in the study area.

中文翻译：

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砒砂岩区不同植被格局边坡土壤侵蚀强度动态模拟研究

土壤侵蚀研究对于水土保持和生态建设规划具有重要意义。 CA是一种动态建模方法，已广泛用于模拟土壤侵蚀强度的未来变化。本研究以砒砂岩区鲍家沟流域的3个不同植被格局（均匀分布、聚集分布、随机分布）的边坡和一个裸露边坡为研究对象。基于3个降雨周期下不同植被格局边坡的土壤侵蚀强度等级图，采用多准则评价（MCE）和马尔可夫链（CA-Markov）相结合的方法，模拟了4个边坡的土壤侵蚀强度等级图。 。经过测试，均匀分布、随机分布、聚集分布和裸坡模拟图的Kappa系数分别达到80.15%、75.41%、75.92%和76.48%。结果表明，不同植被格局坡地上的土壤侵蚀类型转移方式不同，一般较少的侵蚀区向高度侵蚀区转变，以中度和轻度侵蚀区为主要转移流。对不同植被格局坡地土壤侵蚀强度等级图进行模拟发现，植被均匀分布和随机分布的坡地主要表现为高侵蚀区向低侵蚀区的转变，沉积面积扩大，而植被聚集分布的边坡和裸露边坡主要表现为侵蚀程度较低的地区向侵蚀程度较高的地区的转变。沉积面积缩小。因此，与裸露边坡相比，植被均匀随机分布的边坡对水力侵蚀边坡的土壤侵蚀程度具有较好的抑制作用，而植被聚集分布型边坡的抑制作用最弱。研究结果为研究区规划和实施土壤保持措施提供了重要信息。