Abstract
In 2010, This plan had focused on the public and private forest land in northern Taiwan. Using GIS attribute data from the inventory results of public and private land use data that Forest Bureau had completed in 2008 to conduct changes of forest land changes analysis. The land use types in the data had been classified as consistent with IPCC land use classification types and finished the related properties in the forest land use statistical analysis. Results showed that occupies the largest area of forest land accounting for the total area of land use in 47.82%; followed by agriculture 21.17%, 17.06% settlement, other land 5.27%, 4.74%, grassland and wetland 3.95%. In terms of forest land alone, plantation accounts for 68.98%, the bamboo land accounted for 29.11%, and only 1.91% of natural forest.
Considering regional differences in the distribution of forest land, the project selected Xiangshan District, Hsinchu City, Taoyuan County new home town, Bali Township, Taipei County, Miaoli County and Yilan County Lions Round Lake Township from the northern region as five pilot test areas. Applyed the 5 test areas with two FORMOSAT II images in 2007 and 2009, for compliance IPCC specification of the forest land, a forestry land NDVI image processing, classification and non-vegetation cover regional geographic information extraction, and area of growth and decline of Change Analysis procedure had been built to facilitate changes in non-forest vegetation coverage change detection analysis.
Using Hsinchu District as an example, the overall non-vegetation areas extraction accuracy of forest land reached 92.8% in 2007 and up to 94.2% in 2009. Change analysis showed that the area in 2007 forest land area of a total of 2776.6 hectares, in 2007, forest land, there were 25.5 hectares of non-vegetation cover land, until 2009, forest land within the non-vegetation cover area of 35.5 hectares, of which 26.6 hectares for the new increase the area; two years remained non-vegetation cover in an area of 9.5 hectares of land management units should got more attention.
From 2007 to 2009, non-vegetation cover from the original restore vegetation cover 16.0 hectares. Derogation of forest land will inevitably reduce the effectiveness of forest carbon sequestration, so different periods of follow-up can cover the area of non-growth and decline of vegetation and forest types in the original survey data to be checked, as result we can estimate its carbon sequestration or impairment quantity in the future research .