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定量,不仅意味着要直接在样区观测,或用收集器来测定土壤的损失量,而且也可采用间接的方法来测定。比如采用测定剖面缩短的时间,测定冲刷沟形成的时间及谷底沉积物形成的速度等,依此来推算土壤损失量。要想计算出很长一段时期内上壤的损失总量,只能采用间接测定法。翁德尔(Wa-ndel)和玛克豪森(Muckenhausen)比较新老地形图的土地变化情况,并根据剖面减低的情况和地形特征的变化,来计算该区的
Quantification means not only the observation directly in the sample area, but also the amount of soil loss measured with a trap, and it can also be measured indirectly. For example, by measuring the time to shorten the profile, measuring the time of formation of the erosion ditch and the rate of the formation of sediment at the bottom of the trough, etc., so as to calculate the amount of soil loss. To calculate the total loss of soils over a long period of time, only indirect assays can be used. Wa-ndel and Muckenhausen compare land changes in new and old topographic maps and calculate the change in the area based on the reduction in profile and the change in topographic features