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임종수 ( Jong Su Yim ),정일빈 ( Ii Bin Jung ),김종찬 ( Jong Chan Kim ),김성호 ( Sung Ho Kim ),류주형 ( Joo Hyung Ryu ),신만용 ( Man Yong Shin ) 한국산림과학회 2012 한국산림과학회지 Vol.101 No.2
The 5th national forest inventory (NFI5) has been reorganized to annual inventory system for providing multi-resources forest statistics at a point in time. The objective of this study is to evaluate statistical estimators for estimating forest growing stock in Chungcheongbuk-Do from annual inventory data. When comparing two estimators; simple random sampling (SRS) and double sampling for post-stratification (DSS), for estimating mean forest growing stock (m3/ha) at each surveyed year, the estimate for DSS in which a population of interest is stratified into three sub-population (forest cover types) was more precise than that for SRS. To combine annual inventory field data, three estimators (Temporally Indifferent Method; TIM, Moving Average; MA, and Weighted Moving Average; WMA) were compared. Even though the estimated mean for TIM and WMA is identical, WMA-DSS is preferred to provide more smaller variance of estimated mean and to adjust for catastrophic events at a surveyed year (so-called lag bias) by annual inventory data.