摘要
建设用地的扩张是影响陆地生态系统碳储量变化的重要驱动因素。以重庆市为研究区域,基于重庆市土地利用数据、土壤数据、植被数据,从建设用地扩张的视角,采用InVEST模型,结合收集的碳密度数据,对重庆市2000年、2005年及2010年碳储量的变化进行了分析。结果表明:2000—2010年重庆市土地利用变化显著,建设用地是主要的转入者,共增长1 505.58km^2,其中90%以上的区域来自耕地以及阔叶林,造成碳净损失1.796Mt。2005—2010年重庆市建设用地变化更加剧烈,这期间建设用地共扩张998.19km^2。建设用地主要是由西部中心逐渐向四周扩张,且增长速率加快。建设用地由2000年的598.88km^2增加到2005年的1 097.27km^2,扩张导致总碳储量减少了1 169 982.18t,其中阔叶林的碳损失达到72%;2010年建设用地增加至2 095.46km^2,占用耕地以及阔叶林是主要的扩张形式,扩张导致总碳储量减少了1 169 982.18t。可见,建设用地扩张过程中,碳损失的主要来源为耕地及阔叶林,其次是针叶林、草原、草地等。选择固碳能力较弱的裸地与草甸作为建设用地的扩张目标,有利于重庆市碳储量的保护与增长。
The expansion of construction land is an important driving factor affecting the change of carbon storage in terrestrial ecosystem.Based on Chongqing land use data,soil data,vegetation data,from the perspective of expansion of construction land,we use InVEST model and combine with the collected carbon density data to analyze the changes in carbon stocks in Chongqing City in 2000,2005 and 2010.The results show that the land use change is significant from 2000 to 2010,and the construction land is the main entrant,with a total growth of 1 505.58 km^2.Among them,more than 90%of the area comes from cultivated land and broad-leaved forest,resulting in a net carbon loss of 1.796 Mt.From 2005 to 2010,the construction land in Chongqing changed more intensely,the construction land expanded by 998.19 km^2.Construction land mainly expanded from the western center,gradually to the surrounding area,and the growth rate accelerated.The construction land increased from 598.88 km^2 in 2000 to 1 097.27 km^2 in 2005,and the total carbon storage decreased by 1 169 982.18 tons.The carbon loss of broad-leaved forest reached to 72%.In 2010,the construction land increased to 2 095.46 km^2,expansion occurred in broad-leaved forest,expansion led to the reduction of total carbon stocks of 1 169 982.18 tons.It can be seen that the main sources of carbon loss during the expansion of construction land are cultivated land and broad-leaved forest,and followed by coniferous forest,grassland and grassland.Construction land expansion targeting the bare land and the meadow with weak carbon sequestration are beneficial to the protection and growth of carbon storage in Chongqing.
作者
虎帅
张学儒
官冬杰
HU Shuai;ZHANG Xueru;GUAN Dongjie(Chongqing Jiaotong University,Chongqing 400074,China)
出处
《水土保持研究》
CSCD
北大核心
2018年第3期323-331,共9页
Research of Soil and Water Conservation
基金
国家自然科学基金(41501202)
国家自然科学基金(41501202)
上海市城市化生态过程与生态恢复重点实验室开放基金(SHUES2012A04)
上海市城市化生态过程与生态恢复重点实验室开放基金(SHUES2012A04)
国家社科基金后期资助项目(16FJY010)
重庆市基础科学与前沿技术研究项目(cstc2017jcyjAX0210)
