Impact of drought on net primary productivity of vegetation in arid and semi-arid areas： a case study of Hexi Corridor
Received date: 2020-04-30
Revised date: 2020-06-29
Online published: 2021-01-29
Drought has an important impact on the carbon cycle of the ecosystem. With the global warming increasing the frequency of drought events， it is of great significance to study the impact of drought on the net primary productivity of vegetation. Improving the time resolution of the net primary productivity of vegetation is an important way to understand the mechanism of drought on NPP. Based on the five-day NDVI remote sensing data， this paper uses the Hexi Corridor as the research area and uses the CASA model to estimate the five-day step scale NPP from 2010 to 2015 ， The five-day precipitation is defined as a basic unit of drought， using standard scores to explore the impact of drought on vegetation NPP. The results show that based on high-resolution remote sensing data， the effect mechanism of drought on NPP can be effectively detected. During the study period， the frequency of drought in the Hexi Corridor averaged 6 to 44 times， -0.23 g·m-2·yr-1， the impact amplitude is -1.93%， the overall impact is small. Drought has the greatest impact on forest land， at 3.70%， followed by grassland， and desert is the least. As the duration of the drought increases， the NPP change trend is a process of decreasing first， then decreasing， and finally stabilizing. Drought has the greatest impact on NPP in summer， the smallest in winter， and the greatest impact on forest land in autumn.
Key words： drought; net primary productivity; CASA model; standard score; Hexi Corridor
Chuanhua Li , Huanhuan Yin , Tongbin Zhu , Min Zhou , Yutao Wang , Hao Sun , Hongjuan Cao , Haiyan Han . Impact of drought on net primary productivity of vegetation in arid and semi-arid areas： a case study of Hexi Corridor[J]. Journal of Desert Research, 2021 , 41(1) : 145 -155 . DOI: 10.7522/j.issn.1000-694X.2020.00061
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