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应用McQueen型便携式降雨模拟器,我们在湿润新热带区的两个保护区内模拟了小径表面及其邻近林区的降雨。我们的结果证实,小径上径流形成和土壤颗粒分离的速率显著地比较高,且径流在路面频繁形成,而小径以外的区域仅偶尔出现。我们估计,在Jatun Sacha地区,30分钟内15mm的降雨量将会从小径表面剥蚀3186kg/km~2土壤(11×10~4kg/km~2;这一数字与下面括号中的数字为原文所列,文章中并未出现——译者注),在La Selva地区则为4716kg/km~2(6.0×10~4kg/km~2)。在小径以外的区域,相同雨量在Jatun Sacha仅剥蚀0.075～1.1×10~4kg/km~2,在La Selva为0～1.1×10~4kg/km~2。雨林区小径的高侵蚀潜力强调说明了对生态旅游及其它依托于小径的雨林活动需要进行精心管理。
Using the McQueen Portable Rainfall Simulator, we simulated rainfall on the surface of small trails and adjacent forest areas in two protected areas in a humid neotropical zone. Our results confirm that the rate of runoff formation and soil particle separation is significantly higher on the trail, and runoff frequently forms on the road, while the trails outside the trail only occur sporadically. We estimate that in the Jatun Sacha area, a rainfall of 15 mm in 30 minutes would denude 3186 kg / km ~ 2 soil (11 × 10 ~ 4 kg / km ~ 2) from the surface of the footpath; this number is the same as the number in brackets below In the La Selva region, it is 4716 kg / km ~ 2 (6.0 × 10 ~ 4 kg / km ~ 2). In areas other than the footpath, the same amount of rainfall erodes only from 0.075 to 1.1 × 10 ~ 4 kg / km ~ 2 at Jatun Sacha and from 0 ~ 1.1 × 10 ~ 4 kg / km ~ 2 at La Selva. The high erosion potential of the Rainforest Trail underscores the need for careful management of ecotourism and other rainforest activities that rely on trails.