地理翻譯(2.0.（core case study)4+Figure2-1)

原文:
They built V-shaped concrete dams across the creeks at bottoms of several forest valley in the Hubbard Brook Experimental Forest in New Hampshire. The dams are anchored on impenetrable bedrock so all surface water leaving each forest valley had to flow across a dam, where scientists could measure its volume and dissolved nutrient content.
翻譯:
在新罕布什爾州，他們修建了V型混泥土水壩在哈布魯克實驗林里的幾個溪谷之中，大霸固定在岩床上，使所有離開森林的地表水流過了大壩，科學家可以藉此衡量養分的溶解量。

原文:
Figure2-1
Control field experiment to measure tje effects of deforestation on the loss of water and soil nutrients from a forest. V-notch dams were built into the impenetrable bedrock at the bottoms of several valleys (left) so that water and nutrients flowing from each valley could be collected and measured for volume and mineral content. Baseline data were collected on the forested valley (left) that acted as the control site. Then all the trees in one valley (the experimental site) were cut (right) and the flows of water and soil nutrients from this experimental valley were measured for three years.
翻譯:
圖2-1
控制區域水和土壤養分流失的實驗，以衡量砍伐森林的損失，V型缺口大霸被建造在幾個樹木根部難以貫穿的岩床上，使所有溶於水的養分和礦物質可以被收集和測量在森林溪谷擔任監測的實驗所收集的基準值，為所有樹木在溪谷〈實驗所〉測定三年溶水的養分流失的實驗性數值。