干旱区城市化对生态系统碳库的影响——以乌鲁木齐市为例

发布时间：2018-04-26 16:48

本文选题：土地覆被变化 + 干旱区生态系统碳库　；参考：《自然资源学报》2016年07期

【摘要】：城市化是影响区域生态系统碳循环的主要原因,也是评估生态系统碳循环的最大不确定因素。论文利用1990与2010年Landsat TM数据,基于V-I-S城市土地覆被模型和决策树分类法,获得乌鲁木齐土地变化时空格局;结合野外实测数据和文献检索得到研究区不同土地覆被类型的土壤与植被碳密度,估算了城市土地变化对生态系统碳库的影响。结果表明:1)1990—2010年间,乌鲁木齐城市不透水地表(impervious surface areas,ISA)以中部南部内部填充与北部扩张的形式约增加62%,主要占用农田(27%)与荒漠(62%)。2)乌鲁木齐市生态系统碳库主体(95%)分布在土壤中,城市土地覆被变化导致约25%的碳库损失,由农田、裸土/残存荒漠以及城市绿地转变为ISA解释了68%的土壤有机碳和63%的植被碳损失量,其空间分布与ISA的扩张相一致。城市植被及其土壤具有较高的碳密度,合理的城市规划可以抵消部分因土地变化而损失的生态系统碳。
[Abstract]:Urbanization is the main reason that affects the carbon cycle of regional ecosystem, and it is also the biggest uncertain factor to evaluate the carbon cycle of ecosystem. Based on the Landsat TM data of 1990 and 2010, based on the V-I-S urban land cover model and decision tree classification, the spatial and temporal patterns of land change in Urumqi are obtained. Based on field measured data and literature retrieval, the effects of urban land change on ecosystem carbon pool were estimated by using soil and vegetation carbon density of different land cover types in the study area. The results show that the impervious surface as a result of the impervious surface of Urumqi city between 1990 and 2010 increased by 62% in the form of internal filling in the central and southern part and expansion in the north, mainly occupied farmland 27) and desert 622%. 2) the main body of the ecosystem carbon pool in Urumqi was 95%). The change of urban land cover resulted in about 25% loss of carbon pool. The transformation from farmland, bare soil / residual desert and urban green space to ISA explained 68% of soil organic carbon and 63% of vegetation carbon loss, and its spatial distribution was consistent with the expansion of ISA. Urban vegetation and its soil have high carbon density, and reasonable urban planning can offset some of the loss of ecosystem carbon due to land change.
【作者单位】：中国科学院新疆生态与地理研究所荒漠与绿洲生态国家重点实验室;中国科学院大学;中国科学院地理科学与资源研究所;
【基金】：国家自然科学基金项目(31170347) 中国科学院知识创新工程重要方向项目(KZCX2-YW-T09);中国科学院百人计划项目(Y174131001)~~
【分类号】：X171

【相似文献】