The field experiment was carried out at Huitong Forest Ecological Research Station in southwest part of Hunan Provice Results obtained from three types C. lanceolata intercropped with maiza (type A); C, lanceolata intercropped with upland rice (type B) and C. lanceolata only (type C) during 3 years are summarized as follows:1. The horizontal structure of trees and crops varies with the stand ages; the coverage of trees increases with increasing the stand ages and the coverage of crops decreases with increas...