自然土壤经人类耕作活动后的变化如阿?在土壤剖面上有何反映?对于土壤分类与土壤肥力的影响如何?这些都是土壤研究中十分重要的课题。在土壤分类力面,自然土壤若受人为活动的影响及其所导致的土壤性质的变异大,便应将这类土壤在分类中作较高极的划分;否则,则应作较低极的归类。在土壤肥力力面,不同的耕作方法常引起不同的肥力变化,浅耕主要影响表土,往往形成犁底层;深耕可能影响到心土,甚至底土,能够 Changes in natural soils after human farming activities such as A? What is the reflection on the soil profile? How is the impact on soil classification and soil fertility? These are all very important issues in soil research. In terms of soil classification, natural soils should be classified as higher poles if they are affected by anthropogenic activities and the variability of the soil properties they cause is high. Otherwise, Classified. In terms of soil fertility, different farming methods often cause different changes in fertility, shallow tillage mainly affects the topsoil, often form the plow bottom; deep plowing may affect the heart and soil, and even subsoil, can