Soil erosion and soil conservation：练习题

Which of the following is considered a major agent of soil erosion?

How does the regular addition of manure or compost help in the conservation of soil against erosion?

Which practice helps to prevent wind erosion by breaking the speed of the wind across open fields?

Which method of soil conservation involves planting rows of trees or shrubs at the edges of fields to reduce the velocity of air movement and prevent the removal of topsoil?

Which soil conservation method involves ploughing across a slope rather than up and down to create barriers for water runoff?

Describe how terracing serves as an effective physical method of soil conservation on steep slopes.

Distinguish between rill erosion and gully erosion by comparing the size of the channels formed and whether they can be removed by standard cultivation techniques.