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Submitted on: 15 October 2008.
Revised on: 16 December 2008.
Accepted on: 01 January 2009.
___________________JOURNAL OF FORESTRY RESEARCH---NORTHEAST FORESTRY UNIV
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Submitted on: 24 March 2014.
Revised on: 14 June 2014.
Accepted on: 14 July 2014.
___________________JOURNAL OF FORESTRY RESEARCH---NORTHEAST FORESTRY UNIV
Submitted on: 08 November 2006.
Revised on: 03 February 2007.
Accepted on: 30 March 2007.
___________________JOURNAL OF FORESTRY RESEARCH---NORTHEAST FORESTRY UNIV
Submitted on: 02 September 2003.
Revised on: 26 November 2003.
Accepted on: 15 January 2004.
___________________JOURNAL OF FORESTRY RESEARCH---NORTHEAST FORESTRY UNIV