A PRELIMINARY STUDY ON VERIFYING AND EVALUATING THE PROJECT FOR AFFORESTATION ALONG THE YANGTZE RIVER WITH UNEQUAL PROBABILITY TWO-STAGE SAMPLING

It is the first time that a study on verifying and evaluating the project for afforestation along the upper and middle course of the Yangtze River has been made by using unequal probability two-stage sampling in Yunnan Province. It has been proved that this method is highly effective and accurate in the verification and evaluation. It is worth further studying and consummating, so that it can be fully utilized in monitoring practice in forestry. The result shows that the network of the protective forests established along the upper and middle course of the Yangtze River in 1990 is a remarkable success.