doi:

DOI: 10.3724/SP.J.1258.2011.00147

Chinese Journal of Plant Ecology (植物生态学报) 2011/35:2 PP.147-158

Simulating impacts of summer drought on forest dynamics in Dongling Mountain


Abstract:
Aims Climatic change has and will continue to decrease summer precipitation in the Dongling Mountain area of Beijing, China. Decreased precipitation impacts trees and hence temperate forest vegetation. Experimental studies suggested that the effects of decreasing summer precipitation on forest were closely related to species-specific characteristics during drought. Our major goals were to project the impact of decreasing summer precipitation on forest dynamics in this region and to analyze long-term consequences of tree-species specific drought response of the temperate forest ecosystem. Methods We used LPJ-GUESS dynamic vegetation model coupled with different water uptake strategies to investigate drought effects on trees and forests in this temperate region of China. Important findings Increases in net primary productivity (NPP) and carbon biomass of the predicted area under future climate conditions of increased temperature and elevated CO2 concentration were independent of summer precipitation. This suggests that precipitation will not be the limiting factor in this area. However, tree diversity strongly depended on the drought response that we assumed. Drought-sensitive tree species (e.g., Juglans mandshurica) were not influenced by long-term drought, whereas the carbon biomass of the most drought-tolerant species (i.e., Quercus liaotungensis) would decrease in the future. Moreover, tree-species specific drought response will affect the water cycle of the temperate forest, including evapotranspiration. Our findings of the species-specific drought response should be considered in future ecosystem models.

Key words:drought response strategy, evapotranspiration, LPJ-GUESS model, net primary productivity (NPP), species composition, summer precipitation

ReleaseDate:2014-07-21 15:59:28



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