Keywords :
Spatial Patterns; Carbon Fluxes
บทคัดย่อ :
The statistical analysis shows that there are considerable differences in the
ecosystem carbon fluxes among biomes. It suggests there would be a certain latitudinal
pattern of carbon fluxes in the Northern Hemispheric terrestrial ecosystems.
Regional integration studies have found that GPP in China (Yu et al. 2013), Europe,
and North America (Van Dijk and Dolman 2004; Luyssaert et al. 2007), and global
forest ecosystems (Wang et al. 2008) had a general trend with increasing latitude.
However, the spatial pattern was divergent with the different study region interested.
For example, Valentini et al. (2000) pointed out that GPP of European forest
remains stable but RE increases with the increased latitude. On contrary, Van Dijk
and Dolman (2004) pointed out that GPP of European forest decreased while RE
remains stable with the increase of latitude. Therefore, it is necessary to analyze the
observations of carbon fluxes in Northern Hemisphere as a whole so as to more
accurately reveal the spatial variation of carbon fluxes in the Northern Hemispheric
terrestrial ecosystems.
Terrestrial ecosystems in the mid- and high-latitudes (40-60(degrees)N) have been
considered to be major carbon sink areas in the Northern Hemisphere (Tans et al.
1990; Dixon et al. 1994; Ciais et al. 1995), especially the temperate and boreal
forest ecosystems in Europe and North America (Wofsy et al. 1993; Goulden et al.
1996; Valentini et al. 2000). In fact, large areas of forest, grassland, and other
vegetation types are distributed in the mid- and low-latitudes of the Northern
Hemisphere. However, we have little knowledge about the carbon budget of these
ecosystems.
At present, with the development of eddy covariance observation, more than 400
eddy covariance flux sites have been established in the world, covering various
types of ecosystems include forest, grassland, cropland, wetland, tundra, and desert
(Baldocchi 2014). It lays a solid foundation for us to elaborate the spatial variation
of carbon fluxes in the Northern Hemisphere.
เอกสารอ้างอิง :
Chen, Z. (2018a). Spatial Patterns of Carbon Fluxes. In Spatial Patterns and Mechanisms for Terrestrial Ecosystem Carbon Fluxes in the Northern Hemisphere (pp. 47-62). Springer, Singapore.
