摘要
研究目的:探析不同土地利用模式下碳储量的空间差异特征,为优化城镇土地利用及其生态效益提供参考。研究方法:InVEST碳储量修正模型、归一化不透水地表指数(NDISI)和层次聚类分析。研究结果:(1)2014年北京市三山五园地区碳储量为23.31×10~4 t,单位土地面积平均碳储量32.28 t/hm^2;各街道碳储量差异明显。(2)以NDISI变化率表征土地利用开发强度,1992-2014年间上地街道开发强度最高,青龙桥街道(颐和园)开发强度最低。(3)该区各街道碳储量与其区位、用地结构及开发建设模式密切相关,开发建设活动并非一定会降低城镇土地碳汇能力。研究结论:土地利用模式影响城镇土地碳储能力,加强城镇土地利用模式与生态效益研究,有助于合理制定城镇土地利用政策。
Taken the carbon storage as the ecological benefit index, this paper aims to analyze the spatial differences of carbon storages among various land use pattern in the Three-hills and Five-gardens Area of Haidian District, Beijing City. Methods applied in this paper include the InVEST Carbon model, land use pattern index based on the Normalized Impervious Surface Index（NDISI） and hierarchical cluster analysis. The results show that the carbon stored in the Three-hills and Five-gardens Area in 2014 was 233.1 thousand tons in total, and the average carbon storage of land is 32.28 t/hm^2. There are significant spatial differences of carbon storages among the sub-districts; for example, all of the average carbon storage of land in the sub-district of Xiangshan, Wanliu and Sijiqing are higher than 41 t/hm^2, while lower than 28 t/hm^2 in the sub-district of Malianwa, Shuguang and Shangdi. Comparing the carbon storage with the land utilization intensity quantified by the change rate index of NDISI, this paper found that the increasing of land use intensity did not necessarily lead to the reduction of carbon storage; the carbon storage in a given area was dependent on its location, land use intensity and structure, as well as development modes. The compact construction might provide enough green spaces, which has the potential capability of higher carbon storage, such as Wanliu and Sijiqing. Therefore, from the aspect of carbon storage, not only land use intensity but also land use structure has highly influence on the ecological benefit of urban land use. In conclusion, it is supposed that studies about urban land use pattern and its ecological benefit need to be enhanced to optimize the comprehensive benefit of land use in the future.
出处
《中国土地科学》
CSSCI
CSCD
北大核心
2017年第4期61-70,共10页
China Land Science
基金
国土资源部土地利用重点实验室2016年开放基金(KLLU201602)
关键词
土地利用
碳储量
生态效益
土地开发模式
三山五园
land use
carbon storage
ecological benefit
land development pattern
Three-hills and Five-gardens Area
