Impact of drought on net primary productivity of vegetation in arid and semi-arid areas： a case study of Hexi Corridor

doi:10.7522/j.issn.1000-694X.2020.00061

Journal of Desert Research ›› 2021, Vol. 41 ›› Issue (1): 145-155.DOI: 10.7522/j.issn.1000-694X.2020.00061

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Impact of drought on net primary productivity of vegetation in arid and semi-arid areas： a case study of Hexi Corridor

Chuanhua Li(), Huanhuan Yin, Tongbin Zhu, Min Zhou, Yutao Wang, Hao Sun, Hongjuan Cao, Haiyan Han

College of Geography and Environmental Science，Northwest Normal University，Lanzhou 730070，China

Received:2020-04-30 Revised:2020-06-29 Online:2021-01-29 Published:2021-01-29

Abstract

Abstract:

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

CLC Number:

S342.1

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.

Figures/Tables 10

Fig.1 Overview of Hexi Corridor of China

Fig.2 Verification of measured and estimated values of NPP in Hexi Corridor of China

Fig.3 Distribution of annual average NPP and drought frequency in Hexi Corridor of China from 2010 to 2015

Fig.4 Effects of different vegetation types on NPP in drought events in Hexi Corridor of China

Fig.5 Spatial distribution of mean value of drought on five-day NPP in Hexi Corridor of China

Fig.6 Effects of different drought durations in Hexi Corridor of China on mean NPP of different vegetation types (horizontal axis represents the nth five days of drought duration)

Fig.7 Variation of average NPP relative mean standard score of drought duration in Hexi Corridor of China (A, B, C, respectively representing forest land, grassland, desert)

Fig.8 Drought changes in the average NPP relative mean standard score of different vegetations in different seasons in Hexi Corridor of China (A, B, C, respectively representing forest land, grassland, desert)

Fig.9 Spatial distribution of drought on NPP in Hexi Corridor of China in different seasons

Table 1 Comparison of NPP and literature values in Hexi Corridor of China

作者	研究区	研究时段	草地	林地	荒漠
冯益明等^[31]	甘肃省	2010年	43.6	172.3	11.1
周妍妍等^[34]	疏勒河流域	2001—2015年	89.20	103.65	52.46
焦伟等^[35]	西北干旱区	2000—2014年	252.2	400.2	51.5
杨冬辉^[36]	石羊河流域	2009年	67.36	358.8	—
本研究	河西走廊	2010—2015年	80.51	332.47	22.06

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Impact of drought on net primary productivity of vegetation in arid and semi-arid areas： a case study of Hexi Corridor

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