Scale dependence in quantification of land-cover and biomass change over Siberian boreal forest landscapes
作者：Tingting Zhao , Kathleen M. Bergen ,Daniel G. Brown , Herman H. Shugart 出版商：Landscape Ecol 出版日期：2009
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Abstract:We investigated the influence of remote sensing spatial resolution on estimates of characteristic land-cover change (LCC) and LCC-related aboveground biomass change (Dbiomass) in three study sites representative of the East Siberian boreal forest. Data included LCC estimated using an existing Landsatderived land-cover dataset for 1990 and 2000, and above-ground standing biomass stocks simulated by the FAREAST forest succession model and applied on a pixel basis. At the base 60 m resolution, several landscape pattern metrics were derived to describe the characteristic LCC types. LCC data were progressively degraded to 240, 480, and 960 m. LCC proportions and Dbiomass were derived at each of the coarser resolutions and scale dependences of LCC and Dbiomass were analyzed. Compared to the base 60m resolution, the Logged LCC type was highly scale dependent and was consistently underestimated at coarser resolutions. The Burned type was under- or over-estimated depending strongly on its patch size. Estimated at the base 60 m resolution, modeled biomass increased in two sites (i.e.,3.0 and 6.4 Mg C ha1 for the Tomsk and Krasnoyarsksites, respectively) and declined slightly in one site (i.e.,-0.5 Mg C ha-1 for the Irkutsk site) between the two dates. At the degraded resolutions, the estimated Dbiomass increased to 3.3 and 7.0 Mg C ha-1 for the Tomsk and Krasnoyarsk sites, while it declined to -0.8 Mg C ha-1 for the Irkutsk site. Results indicate that LCC and Dbiomass values may be progressively amplified in either direction as resolution is degraded,depending on the mean patch size (MPS) of disturbances, and that the error of LCC and Dbiomass estimates also increases at coarser resolutions.
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