Li Liang, Liu Minxia, Qi Yuhan, Zhang Guojuan, Yu Ruixin
College of Geography and Environmental Science, Northwest Normal University, Lanzhou, China.
Environ Monit Assess. 2022 Dec 1;195(1):169. doi: 10.1007/s10661-022-10775-5.
High-load carbonaceous and dust aerosols can significantly reduce direct radiation (DIRR), which would affect photosynthesis in terrestrial ecosystems, thereby further affecting the productivity of vegetation. Based on this, a variety of remote sensing data were used to study the spatiotemporal distributions and changing tendencies of the absorbing aerosols, CO, DIRR, and gross primary productivity (GPP) in China during 2005-2019; then, the relationships were analyzed between different types of absorbing aerosols and DIRR as well as GPP. The results showed that the annual mean absorbing aerosols index (AAI) in China during 2005-2019 was 0.39, with a slow growth rate of 0.02 year, and the emission of CO showed a decreasing trend with each passing year, especially in North China Plain and Sichuan Basin. Carbonaceous and dust aerosols were predominantly bounded by Hu line. The east of Hu line was the dominant area of carbonaceous aerosols, and the west of Hu line was the topographical region of dust aerosols. Near the Hu line was the dominant area of carbonaceous-dust aerosols. However, the Karamay-Urumqi-Hami area and Northeast China Plain were exceptional. During the vegetation growing season, different types of absorbing aerosols significantly negatively affected GPP. From a perspective of regional scale variation pattern, the negative effect of absorbing aerosols on vegetation productivity was the most significant in Northeast China; from the perspective of the effects of different vegetation types, the negative effect of absorbing aerosols on grasslands was greater than that of woodlands; from the perspective of the composition characteristics of aerosols, the negative effect of dust aerosols on GPP was greater than that of carbonaceous aerosols.
高负荷的碳质和沙尘气溶胶会显著降低直达辐射（DIRR），这将影响陆地生态系统中的光合作用，进而进一步影响植被生产力。基于此，利用多种遥感数据研究了2005 - 2019年中国吸收性气溶胶、一氧化碳（CO）、直达辐射和总初级生产力（GPP）的时空分布及变化趋势；然后分析了不同类型吸收性气溶胶与直达辐射以及总初级生产力之间的关系。结果表明，2005 - 2019年中国吸收性气溶胶指数（AAI）的年平均值为0.39，年增长率为0.02，CO排放量逐年呈下降趋势，尤其是在华北平原和四川盆地。碳质和沙尘气溶胶主要以胡焕庸线为界。胡焕庸线以东是碳质气溶胶的主要区域，以西是沙尘气溶胶的地形区域。靠近胡焕庸线的是碳质 - 沙尘气溶胶的主要区域。然而，克拉玛依 - 乌鲁木齐 - 哈密地区和东北平原是例外。在植被生长季节，不同类型的吸收性气溶胶对总初级生产力有显著的负面影响。从区域尺度变化模式来看，吸收性气溶胶对植被生产力的负面影响在东北地区最为显著；从不同植被类型的影响来看，吸收性气溶胶对草地的负面影响大于对林地的影响；从气溶胶的组成特征来看，沙尘气溶胶对总初级生产力的负面影响大于碳质气溶胶。
