基于InVEST模型的甘肃白龙江流域生态系统碳储量及空间格局特征  

Carbon storage and spatial distribution characteristics in the Bailongjiang Watershed in Gansu based on In VEST model

作　　者：张影[1] 谢余初[1,2] 齐姗姗[1] 巩杰[1] 张玲玲[1] 

机构地区：[1]兰州大学资源环境学院西部环境教育部重点实验室,兰州730000 [2]广西师范学院北部湾环境演变与资源利用教育部重点实验室,南宁530001

出　　处：《资源科学》2016年第8期1585-1593,共9页Resources Science

基　　金：国家自然科学基金项目(41271199);甘肃省民生科技计划项目(1503FCME006)

摘　　要：区域碳储量的空间分布特征研究可为区域生态系统碳库管理和减排增汇政策制定提供重要科学依据。基于In VEST模型和GIS技术,估算及分析了2010年甘肃白龙江流域碳储量及其空间格局,并探讨了海拔、坡度和坡向对碳储量空间分布的影响。结果表明:甘肃白龙江流域碳总储量为251.57Tg C,平均碳密度为136.46Mg C/hm^2;其中,土壤碳储量为202.20Tg C,植被碳储量为49.37Tg C。碳储量空间分布呈现一定的规律性,碳储量高值区主要集中在流域西北部山区(如迭部县)和白水江南岸(如白水江国家级自然保护区),云杉、冷杉类常绿针叶林的碳总储量最大;低值区多分布在流域东部和东南部(如武都区)、宕昌县东北部等区域。碳储量随海拔高度和坡度的增加呈现先增加后减小的趋势,其高值区主要分布在1500~3500m和25°~40°区段;阴坡和半阴坡区域的碳储量大于阳坡和半阳坡。研究结果可为流域生态系统碳库管理及人类活动管控提供参考。Research into the spatial distribution characteristics of carbon storage plays an important role in ecosystem carbon pools and management. Based on the carbon module of INVEST and GIS, the Bailongjiang watershed in Gansu, China was selected as a case study to estimate carbon storage and analyze the impact of vegetation types, elevation, slope and slope direction for the spatial distribution of carbon storage. The total carbon storage of the watershed was 251.57 TgC, and the average carbon density was 136.46 MgC/hm2. Among them, the soil carbon storage accounted for 202.20 TgC while vegetation carbon storage was 49.37 TgC, soil carbon storage was the main part of the total carbon storage in the Bailongjiang watershed. The spatial distribution of carbon storage was concentrated in the northwestern mountain forest region （e.g. Diebu Count）and the southern area of Baishuijiang （e.g. Baishuijiang National Nature Reserve）. Spruce and fir and evergreen coniferous forest occupied the largest vegetation carbon in the watershed; the value in the eastern and southeastern part of the study area was lower, such as in Wudu District and the northeast part of Tanchang, and the carbon storage in alpine sparse vegetation area was the lowest. Carbon storage had apparently spatial differentiation with the zonality of elevation, slope and slope direction in the Bailongjiang watershed. The watershed carbon storage increased with increasing elevation, then decreased with increasing elevation. Most of the watershed carbon storage was distributed between 1500m to 3500m and 25° to 40°. Carbon storage was higher in the areas belonging to shady slope and semi-shady slope than that of semi-sunny slope and sunny slope. These results can be used for the governance of ecosystem carbon pools and human activities at the watershed scale.

关 键 词：碳储量 空间格局 In VEST模型 生态系统服务 甘肃白龙江流域 

分 类 号：X171[环境科学与工程—环境科学]