Application of Afterwards Stratified Sampling Technique to Inventory of Forest Resources' Planning and Design

The paper reviews the developmental application of sampling skills to the inventory of forest resources' planning and design in our country,and introduces application occasion,sampling methods and theoretical basis of afterwards stratified sampling technique.It concerns that the theory of afterwards stratified sampling technique is perfect and operation is simple.Its application can both improve sampling precision and lower expense for the inventory under the circumstance of not enough of general information.Taking the sampling data selected from the inventory of forest resources' planning and design in Yanshan county in 2005 as an example,the comparison between afterwards stratified sampling and systematic sampling reveals that sampling precision is obviously improved.