关键词: 水体富营养化, 空间分布, 土地利用强度, 土地利用, 密云水库

Abstract: Improving forest ecosystem services has become one of the most important aims of forest management in the context of current ecological civilization construction. In this paper, four typical subtropical secondary forest communities in Lishui Forest Farm, Jiangsu Province were selected as the study objects. We used the FORET model to simulate forest dynamics of these communities under the natural state and artificial management. By comparing the changes before and after the implementation of management measures in species importance value and total biomass of the stand, we evaluated the effects of different tending management measures. For the Quercus acutissima+Q. variabilis community, there was no obvious difference in changes of forest community composition and structure between under conventional tending measures and in natural development. For the Pinus massoniana+Q. fabri community, Ilex chinensis+P. massoniana community and Q. acutissima+P. massoniana community, which were at relatively early succession stages, comprehensive measures, including released thinning, replanting, and clean cutting, sped up the community succession, and promoted the accumulation of stand biomass. Our results suggested that the forest gap model had a potential application value in the decisionmaking of forest management, and it may be a useful tool for quantitative assessment of forest management effect.

Key words: Miyun Reservoir., land use, land use intensity, water eutrophication, spatial distribution