Wang Zhi-Hui, Bai Yu-Hua, Zhang Shu-Yu
College of Environmental Sciences, Peking University, Beijing 100871, China.
J Environ Sci (China). 2005;17(3):353-9.
The first detailed inventory for volatile organic compounds (VOC) emissions from vegetation over Yunnan Province, China was presented. The spatially and temporally resolved inventory was developed based on a geographic information system (GIS), remote sensing (RS) data and field measurement data, such as digitized land-use data, normalized difference vegetation index (NDVI) and temperature data from direct real-time measurement. The inventory has a spatial resolution of 5 km x 5 km and a time resolution of 1 h. Urban, agriculture, and natural land-use distributions in Yunnan Province were combined with biomass factors for each land-use category to produce a spatially resolved biomass inventory. A biogenic emission inventory was developed by combining the biomass inventory with hourly emission rates for tree, shrub and ground cover species of the study area. Correcting for environmental factors, including light intensity and temperature, a value of 1.1 x 10(12) gC for total annual biogenic VOC emissions from Yunnan Province, including 6.1 x 10(11) gC for isoprene, 2.1 x 10(11) gC for monoterpenes, and 2.6 x 10(11) gC for OVOC was obtained. The highest VOC emissions occurred in the northwestern, southwestern and north region of Yunnan Province. Some uncertainties were also discussed in this study.
本文给出了中国云南省植被挥发性有机化合物（VOC）排放的首个详细清单。该时空分辨清单是基于地理信息系统（GIS）、遥感（RS）数据以及实地测量数据编制而成，这些数据包括数字化土地利用数据、归一化植被指数（NDVI）以及直接实时测量的温度数据。该清单的空间分辨率为5 km×5 km，时间分辨率为1小时。将云南省的城市、农业和自然土地利用分布与各土地利用类型的生物量因子相结合，生成了一个空间分辨生物量清单。通过将生物量清单与研究区域内树木、灌木和地被植物物种的每小时排放率相结合，编制了生物源排放清单。校正包括光照强度和温度在内的环境因子后，得出云南省每年生物源VOC排放总量为1.1×10¹² gC，其中异戊二烯为6.1×10¹¹ gC，单萜烯为2.1×10¹¹ gC，含氧挥发性有机物（OVOC）为2.6×10¹¹ gC。VOC排放最高的地区位于云南省的西北部、西南部和北部。本研究还讨论了一些不确定性。
