森林采伐限额检查抽样技术探讨

Discussion about Technique of Sampling Plot for Forest Harvesting Quota

摘要:

无证采伐总量=采伐总量-有证采伐总量。有证采伐量的调查，其标志值为单位发证采伐量的实际采伐蓄积，以自然村为一阶单元进行总体平均数的不等群抽样估计。在设置样地对采伐总量调查时，其标志值应为单位面积的实际采伐量，可用总体平均数的双重分层抽样法估计，其分层因子为地貌和林木地。

Abstract:

Harvesting rate without certificate=total harvesting rate-total harvesting rate with certificate. Survey on harvesting rate with certificate adopts non-equal cluster sampling estimation of general average number, regarding nature village as the fist rank unit, and its marking value should take actual harvesting volume as harvesting rate by unit certificate. The marking value should be actual rate by the unit area, it can estimate by method with dual layering and sampling of the general average number, and layering factor as landform and forest site during the survey for total harvesting rate of setting sample plot.