(PP-TMP 
  (P 当)
                    
  (LCP 
    (IP 
      (NP-SBJ 
        (-NONE- *pro*))
                    
      (VP 
        (VV 经过)
                    
        (NP-OBJ 
          (QP 
            (CD 一)
                    
            (CLP 
              (M 片)))
                    
          (NP 
            (NN 胡杨)
                    
            (NN 林区)))))
                    
    (LC 时)))
                    
(PU ，)
                    
(NP-SBJ 
  (NN 修路)
                    
  (NN 人员))
                    
(VP 
  (VP 
    (ADVP 
      (AD 没有))
                    
    (VP 
      (VV 办理)
                    
      (NP-OBJ 
        (ADJP 
          (JJ 有关))
                    
        (NP 
          (NN 手续)))))
                    
  (PU ，)
                    
  (VP 
    (ADVP 
      (AD 就))
                    
    (ADVP 
      (AD 擅自))
                    
    (VP 
      (VP 
        (VV 毁)
                    
        (NP-OBJ 
          (NN 林)))
                    
      (VP 
        (VV 开路))))
argm: 
                    当 经过 一 片 胡杨 林区 时          
                
arg0: 
                    修路 人员          
                
argm: 
                    就          
                
argm: 
                    擅自