The effect of forest reserve conversion to agriculture land on soil properties in the sudano-sahelian zone of Cameroon was investigated. Agricultural activities have caused the progressive reduction of the surface area of Zamai forest reserve, which reduced from nearly 50% of its original surface in 1970 to only about one third in 2016. This study was conducted on four plots that have been cultivated for 3, 29, 50 and 90 years respectively, and a forest reserve soil used as control plot, all located along a chronosequence on Dystric Arenosols. The sandy fraction of cultivated soils varies between 70.00 ± 2.65 and 75.00 ± 2.65%, lower than that of the control soil (76.67 ± 3.21%). Silt contents were very low, but clay contents were higher in cultivated plots, with the highest proportion (28.66 ± 3.05%) seen in the 29 years cultivated plot. The stability index (SI) of different plots was greater than 9%, characteristic of stable structures. Compared to both 50 and 90 year cultivated soils, 3 and 29 years old agricultural soils had lower stability index and are thus more vulnerable to water and wind erosion in accordance with the lowest chemical characteristics observed. There was a gradual increase in acidity of cultivated plots from 3 years reaching higher values of 6.70 ± 0.24 and 6.49 ± 0.75 after 50 and 90 years of cultivation respectively. Ca²⁺ and K⁺ were the most represented bases. Moreover, there was an overall decrease in organic matter, sand and silt contents, SI and C:N, with a relative increase in clay content, pHw, K⁺, Ca²⁺, N, sum of bases and cation exchange capacity from 3 years cropping to 90 years. Control and 90 years cultivated plots were very similar, as a result of the restoration of soil properties after 90 years of farming activities, initiated from 50th year of farming activity.

研究了喀麦隆苏达诺-萨赫勒地区森林储备转化为农地对土壤性质的影响。农业活动导致Zamai森林保护区的表面积逐渐减少，该面积从1970年的原始面积的近50％减少到2016年的大约三分之一。这项研究是在四个已耕种3个土地的地方进行的，分别为29年，50年和90年，并有一片森林保留土壤作为对照样地，都沿着异戊香气溶胶的时间序列排列。耕作土壤的沙质含量在70.00±2.65到75.00±2.65％之间变化，低于对照土壤（76.67±3.21％）。耕地中的泥沙含量非常低，但粘土含量较高，在29年耕地中比例最高（28.66±3.05％）。不同地块的稳定性指数（SI）大于9％，是稳定结构的特征。与50和90年的耕作土壤相比，3和29年的耕作土壤具有较低的稳定性指数，因此，按照观察到的最低化学特性，它们更容易遭受水和风蚀。耕地的酸度从3年开始逐渐增加，分别在50年和90年耕种后达到较高的6.70±0.24和6.49±0.75。钙 耕地的酸度从3年开始逐渐增加，分别在50年和90年耕种后达到较高的6.70±0.24和6.49±0.75。钙 耕地的酸度从3年开始逐渐增加，分别在50年和90年耕种后达到较高的6.70±0.24和6.49±0.75。钙²⁺和K ⁺是最有代表性的碱基。此外，有机物，沙和粉沙含量，SI和C：N总体上有所降低，而粘土含量，pHw，K ⁺，Ca 2 ⁺，N，碱和和阳离子交换容量则从3开始相对增加。年种到90年。对照和90年耕地非常相似，这是从90年耕作活动（从50年耕作活动开始）恢复土壤性质以来的结果。