Study on Carbon Sequestration of Taipei's Green Land using Remote Sensing and GIS

摘要

The application of remote sensing on carbon sequestration has been growing concerns recently. This study focuses on carbon sequestration of Taipei's green land using remote sensing and GIS. The research processes include (1) calculating vegetation index from SPOT images in 1993 and 2007; (2) extracting Taipei's green land (i.e., forestland and grassland) according to the land-cover map generated by SPOT image classification and the land-use map obtained from National Land Surveying and Mapping Center; (3) estimating carbon sequestration of green land based on the model of vegetation index and Net Primary Productivity (NPP); (4) analyzing carbon sequestration change of Taipei's green land from 1993 to 2007; and finally (5) making a comparison of green land's carbon sequestration estimated by land-cover and land-use maps.The result is as follows. The area of Taipei's green land decreases from 1993 to 2007 due to urban sprawl, and this leads to some decrease in the NPP and carbon sequestration as well. However, among green land, the NPP and carbon sequestration of forestland are higher than grassland. As for the comparison of green land's carbon sequestration, the amount calculated by land-cover map is higher than that by land use map, which points out that the NPP and carbon sequestration estimated by remote sensing or GIS technologies may be different. But, obviously remote sensing and GIS technologies are a timely and feasible approach for green land to estimate carbon sequestration and monitor its change. The result obtained from this study can be extended to Taipei's green land planning in future.