| The change in land use is an important factor of carbon emission in a certain area, and the land serving as the carrier of carbon emission from humankind. It is necessary to give an overall evaluation and analyze the use of land in the times of imperative low carbon economy to meet carbon-reduction target. It is also a must to optimize the overall situation for use of land and brings great benefit to make full use of land and explore the carbon-reduction on land and its effective use.It is a wise choice to take highly-developed urbanized areas as the prime research object. These areas cover the characteristics of wide range of changes on land use and rapid engrossing economy. The co-relation between urbanization and growth of carbon emission is obvious in these urban lands. Such meaningful research in carbon emission in these areas can make a benefit for us to research on use of low-carbon land and urban land pattern.The essay set two highly urbanized cities as an example, namely, is Yantai and Ji’nan. With overall and deep analysis of remote-sensing images in the year of 2000, 2006 and 2013, the essay covers up much information on urban land category and changes on land use. It also calculates the amount of carbon-emission from urban land use and its changes in these three years with a comparison to separate carbon-emission accounting parameters land use and change. The essay, at the same time, studies on carbon-emission effect and set up a land use pattern optimization model based on the carbon abatement. Above all, it is concluded as following:(1) The land use change is mainly obvious that many farmlands and forestry are turned into construction land. In the aspect of space, land use change distributes in downtown areas and industrial zones, Zhifu District in Yantai in the main area with a comparison to Ji’nan’s east Huaiyin District, west Lixia District and northwest Licheng District. In the aspect of time, land use change in Yantai mainly causes from 2006 to 2013, with a much fast rapid than that from 2006 to 2013. However, construction land obsession did not change at all from 2006 to 2013.(2) These two highly urbanized cities cover more and more land use carbon-emission in one year after another. In Yantai, total amount of carbon-emission is 77.17 t C in 2000, with an increase at 74%, namely, 134 t C in 2013. On the other hand, the total amount of carbon-emission in Ji’nan increases from 266.62 t C in 2000 to 394.57 t C in 2013, with an increase of 48%. To be clear, the main cause of more carbon-emission is progressive construction land use. However, carbon sink from the forestry, serving as a safe and environmental land use, cannot be equal to such amount of carbon-emission.(3) There is a difference between the two cities, Yantai and Ji’nan, in how the land use carbon emissions optimization results fit with land-use planning. To optimize the overall situation for use of land to meet carbon-reduction target, the essay establish a linear model, maximum carbon storage and minimize carbon emissions as its goals, farmland protection, environmental protection and economic development as its constraints, and obtain the land use optimization results. In Yantai, the results are in line with the land use planning. There is a slight decline of farmlands, with a decrease from 363.1km2 in 2006 to 346.116km2. The forestry remains unchanged and construction land expansion, with a increase from 250.95 km2 in 2006 to 270km2. There is a very different result. The level is low in how the land use carbon emissions optimization results fit with land-use planning in Ji’nan. It requires a decrease in construction land, from 712.15km2 to 650.88km2, and an increase in farmland, from 538.63 km2 to 606.37km2. To be concluded, the essay will come up with suggestions on land use patterns, such as, restricting the massive development of construction land use, turning farmlands into forestry in a moderate degree and optimizing urban land patterns. |
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