Abstract: The efficiencies of water, soil and fertilizer conservation of public welfare forests in Jinyun County, Zhejiang Province in 2000-2010 were evaluated based on monitoring data of 117 permanent sample plots by calculating the biomass of six types of forest communities. The results showed that the waterregulation and waterstorage capacity of public welfare forest in Jinyun County was 3.69×108 t, cumulative water conservation efficiency was 2.116 billion yuan, in which efficiencies of waterregulation and waterstorage were 1.577 and 0.539 billion yuan, respectively. Water conservation capacity of different forest communities decreased in the order showed as Phyllostachys pubescent forest> Chinese fir forest> broadleaved forest > Masson pine forest > broad leaved mixed forest>scrub forest. The soil conservation efficiency of public welfare forest was 0.12×108 t. Reduced nutrients loss amounts of N, P, K and organic matters were 9.18×103 t, 2.57×103 t, 2.47×105 t and 3.73×104 t respectively, and the cumulative economic efficiency was 1.428 billion yuan. Soil and fertilizer conservation capacities of different forest communities decreased in the order as broadleaved forest >broad leaved mixed forest > Phyllostachys pubescent forest > Masson pine forest >Chinese fir forest> scrub forest.

Key words: public welfare forest, biomass, water conservation, soil and fertilizer conservation, Jinyun County, Zhejiang Province