A Study On The Relationships Between Stand Age, Climate And Aboveground Biomass Of Forests At Regional Scale

Forests biomass Accounted for 90% of global vegetation carbon sequestration is an important component of the global carbon cycle through the flux and storage of carbon in plant biomass. Consequently, estimating the large scale biomass patterns accurately is crucial for monitoring forest carbon source and sink dynamics worldwide. This paper takes Europe and America as the study area. Using 344 groups biomass data collected on related literature and climate data collected on the world’s climate site as data sources.The relationship between stand age, climate and the ground biomass was explored, and dominant factors associated with the regional pattern of aboveground biomass were screened by the uses of ArcGIS and SPSS 17.0 software. The results are summarized as follows:(1) When considering only the relationship between age and each forest type forest aboveground biomass of each region by linear regression analysis, forest age was a significant positive correlation with the above-ground biomass. R2 values are between 0.087 and 0.595. (2) When considering only the relationship between climatic factors and various forest types of aboveground biomass in each region, there are differences among regions and forest types. There was no significant correlation between climatic factors and aboveground biomass, including European coniferous forests, European broad-leaved forest, European forest and South America broadleaf forest; Except HI humid index, the North American and global coniferous forest aboveground biomass were significantly correlated with climatic factors; Humid index were significantly correlated with North America broadleaf forests and global broadleaf forests aboveground biomass; Cold index and humid index was significantly correlated with American forests and global forest ground biomass; In addition to the actual evapotranspiration, annual precipitation and cold index, Climatic factors were significantly related to American broadleaf forests aboveground biomass. The R2 values of climatic factors between 0.038 and 0.411 are lower than age. (3) Considering the relationship between age, climatic factors and aboveground biomass of each forest type at each region, R2 values are between 0.374 and 0.640. We can see the goodness of fit is better when considered ages and climate together. Age is the most important factor of all forest types and all regions. Its explanatory is between 18.81% and 59.54%, and the explanatory power of climatic factors is between 0.28% and 27.975%.The relationship between stand age, climate factor and forest aboveground biomass was established on large scale in this paper. The study is important for exploring global ecosystem carbon balance, and reasonable for forest resources management and using. Further, it is significant for predicting the influence of the climate change on forest ecosystem.