The World Natural Heritages

Jiuzaigou and Huanglong

are located in the eco-fragile areas of West China. Since 2001

12 repairing models of degraded landscape in the eco-fragile areas were implemented in Songpan County

i.e.

Lycium chinense

Hippophae rhamnoi des

Amygdal us davidiana + Picea as perata

Armeniaca sibirica + P.asperata

P.asperata

Syringa komarowii + Malus kansuensis

P. asperata + Salix argentinensis

P.asperata + Populus cathayana

S .argentinensis

S .argentinensis + P.cathayana

P.cathayana

and A.sibirica + S.argent inensismodels. This paper analyzed both horizontal and vertical species diversity in the 12 models. Results showed there were generally poor species richness and diversity in woody layer. On the contrast

herb layer of most models possessed considerable diversity

along with about 20 species and Shannon-Weiner index over 2.0. Further

most models possessed sound species diversity

contributed by diversity in herb layers. Most models possessed sound species diversity indexes and diversity between models was also greater. With the developing of diversity

it is helpful to constructing a stable and healthy ecosystem and establishing a material foundation for developing to further stage