The urban-suburban study predicted future changes in vegetation

vegetation may last longer than in the suburbs. Recently, the ecological remote sensing research team led by Zhang Yongguang, a professor at Nanjing University's International Institute of Earth System Science, made progress in urban climate change and vegetation photosynthelology monitoring, and the paper was published in Nature-Ecology and Chemistry on June 24.
with the increase of global climate change and the increasing concentration of CO2 in the atmosphere, the weather life of global vegetation, especially in the mid- and high-latitude regions of the northern hemisphere, has changed significantly. The response of vegetation weather period to environmental conditions such as global warming will have an important impact on the photo-co-operation of global vegetation and on-land carbon sinks. At present, the change of vegetation weather mainly uses traditional vegetation index or ground weather observation, but these observations can only reflect the change of vegetation "greenness" and not the real vegetation photoreses. In addition, most previous studies have focused on the effects of temperature on vegetation changes, ignoring other environmental factors that have also changed significantly, such as atmospheric CO2 concentrations.
, Zhang Yongguang, Wang Songhan, a doctoral student at Nanjing University, and others proposed a research method based on the city-suburb gradient. Zhang Yongguang told China Science Daily that because of the heat island effect and high man-made emissions, the temperature and atmospheric CO2 concentration in urban areas will be higher than in the suburbs, so urban areas can be used as a control experiment in the context of temperature and CO2 concentration increase, and the suburbs as a controlled experiment to study the changes in vegetation in the future climate change situation.
In order to extract vegetation photosynthel waiting information, the researchers focused on high spatial resolution curly fluorescence data (OCO-2 SIF), which directly reflects plant photosyntheloma and photosyntheloma physiology and is considered a "lossless probe" for studying plant photosynthelation. Using 880 cities in the mid- and high-latitude regions of the northern hemisphere and their corresponding suburbs as study areas, they extracted photoresort and structural weather information of urban and suburban vegetation, respectively.
results show that the start and peak times of vegetation in urban areas are usually earlier than between suburban vegetation, and the end time of phototechnology is usually later, so urban vegetation usually has a longer growth period. This difference is present in almost all cities in the northern hemisphere and is more pronounced in semi-arid areas.
The researchers further analyzed the decisive factors affecting the difference between vegetation photosynthels and phase regression by methods such as partial correlation analysis and gradual regression, and the results showed that the main factors affecting the early start and peak periods of vegetation photosynthings were temperature and atmospheric CO2, while the main factors affecting the delay of vegetation photoreses waiting period were atmospheric CO2. Finally, based on different emission scenarios, the team also predicted trends in vegetation photoreses over the next 20 years. The study revealed the effects of global change, especially warming and increased CO2 concentrations, on vegetation photosynthelation.
the study also showed that the latest daylight-induced luciferent fluorescent remote sensing technology can provide the latest data support in global change remote sensing, ecological remote sensing.