Under the similar site condition, the secondary forest and the mixed plantations had greater water conservation function and better maintenance of soil fertility than the pure stands did.

Aims We studied root morphology across the first five branch orders of 20 hardwood tree species from secondary forest in northeastern China.

Investigation on natural secondary forest community in Hefei area;

Point pattern analysis of spatial distribution of natural secondary forest populations in mountainous area of Beijing: A case study of Wuling Mountain nature reserve;

Thinning effect on growth status of natural secondary forest;

Nutrient distribution and accumulation patterns of natural secondary forests on the Loess Plateau of Shanxi Province.;

The carbon density and storage in four types of natural secondary forests are studied,and the results show that: 1) the range of carbon density in different apparatus of natural secondary forests is from 0.

The soil water content of different natural secondary forests in eastern mountains of Heilongjiang Province was studied,and the results showed that:①The soil moisture of natural secondary forests in different terrains declined gradually as the soil depth increased;②The soil water contents varied most in the depth of 0～10 cm,up to 20.

The relation of nutrient return revert and density effect of nature poplar and birch;