(PP-PRP 
  (P 由于)
                    
  (IP 
    (IP-SBJ 
      (NP-SBJ 
        (-NONE- *PRO*))
                    
      (VP 
        (NP-TMP 
          (NT 过去))
                    
        (NP-ADV 
          (NN 长期))
                    
        (VP 
          (VP 
            (VV 围)
                    
            (NP-OBJ 
              (NN 湖)))
                    
          (VP 
            (VV 造)
                    
            (NP-OBJ 
              (NN 田))))))
                    
    (VP 
      (VV 造成)
                    
      (IP-OBJ 
        (IP 
          (NP-SBJ 
            (NP-PN 
              (NR 洞庭湖))
                    
            (NP 
              (NN 湖面)))
                    
          (VP 
            (VV 缩小)))
                    
        (PU ，)
                    
        (IP 
          (NP-SBJ 
            (CP-APP 
              (IP 
                (NP-SBJ 
                  (-NONE- *PRO*))
                    
                (VP 
                  (VV 调蓄)
                    
                  (NP-OBJ 
                    (NN 洪水))))
                    
              (DEC 的))
                    
            (NP 
              (NN 能力)))
                    
          (VP 
            (VV 减弱)))))))
arg2: 
                    *PRO* 
                
arg1: 
                    洪水