英:The next experiment involved disturbing the system and observing any changes that occurred.One winter,the investigators cut down all trees and shrubs in one valley(the experimental site),left them where they fell , and sprayed with herbicides to prevent the regrowth of vegetation.Then they compared the inflow and outflow of water and nutrients in this modified experimental site(Figure2-1,right)with those in the control site for 3 years.
中:下一個實驗包含擾亂系統並且觀察發生的任何變化。一個冬天,那些調查者砍倒在一個山谷裡全部的樹和灌木(實驗場所) ,讓他們離開他們被砍倒的地方,並且用除草劑防止植物再生。然後他們比較這個控制三年被改變過的實驗場所流入跟流出的水和營養物。
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