The results showed that different year(A)of Paulownia wheat intercropping and the relationship between tree belt distance(X d)and wheat yield(Y)was Y =90 3290 1 9982 A +1 1924 X d 0 3349 A 2+0 2910 AX d 0 0032 AX 2 d ;the between tree coverage (X c)and wheat yield was Y =0 0406 XA 2 c +1 1539 X c +98 173(X c≤28%), Y=e (4 71516 0 005339X c) (X c>28%);wheat yield in.

Grey evaluation and forecasting of the forest coverage of Heilongjiang province;

RS statistics and analysis for forest coverage of Beijing.;

Optimal protective effect of forest coverage on soil and water loss in Gansu Province;

Afforestation could raise the forest coverage rate,which has positive effect on wind breaking and sand fixation as well as improving the eco-environment of Kangping.

Based on the comprehensiveness of forest coverage rate,total standing forest stock,average forest volume,a new indicator called \'Forest Thickness\'(FT) is put forward in this paper.

As a country rich in forest resources in early history, according to the textual researches, China had a high percentage of forest cover over 60% before the Xia Dynasty established 4 000 years ago.

This paper analyzes the offect of forestry vegetation bestrewing rate change to inner drainage area runoff in the upper reach of Huma River in Daxinganling Area.