[1]XIA Bing,MA Pengyu,XU Cong,et al.Spatiotemporal Variation of NPP and Its Response to Extreme Climate Indices in Yellow River Basin in Recent 20 Years[J].Research of Soil and Water Conservation,2023,30(02):256-266,284.[doi:10.13869/j.cnki.rswc.2023.02.009]
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Spatiotemporal Variation of NPP and Its Response to Extreme Climate Indices in Yellow River Basin in Recent 20 Years
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
30
Number of periods:
2023 02
Page number:
256-266,284
Column:
Public date:
2023-03-10
- Title:
- Spatiotemporal Variation of NPP and Its Response to Extreme Climate Indices in Yellow River Basin in Recent 20 Years
- Keywords:
- NPP; extreme climate; spatiotemporal variation; Yellow River Basin
- CLC:
- Q948
- DOI:
- 10.13869/j.cnki.rswc.2023.02.009
- Abstract:
- MODIS NPP data and extreme weather data are used in order to explore the changes of net primary productivity(NPP)of vegetation in this area and its response to extreme weather indexes. The spatial and temporal dynamics of NPP of vegetation in the Yellow River Basin from 2000 to 2019 and its response to extreme precipitation index and extreme temperature index were analyzed by using slope method and partial correlation analysis. Based on MODIS NPP and extreme climate data, the spatiotemporal variation characteristics and trend of vegetation NPP and its response to extreme climate change in Yellow River Basin from 2000 to 2019 were studied by using trend analysis and partial correlation analysis. The results showed that:(1)in the past 20 years, the vegetation NPP in the Yellow River Basin showed an increasing trend from north to south, and showed an increasing trend in a large area;(2)NPP was mainly positively correlated with extreme precipitation events; among them, except that the pixels with significant positive correlation and extremely significant positive correlation for the longest continuous wet days accounted for 16.5%, the other indicators were more than 25%, indicating that the increase of extreme precipitation events was conducive to the increase of vegetation NPP;(3)the water volume and intensity of extreme precipitation events showed a significant increasing trend, the indicators related to partial cooling in extreme temperature events generally showed a downward trend, and the events related to warming showed an obvious upward trend; there was significant spatial heterogeneity and large interannual difference in their changes;(4)the maximum value of daily maximum temperature, the maximum value of daily minimum temperature, cold night days, cold day days, freezing days and frost days were mainly negatively correlated with vegetation NPP, while the minimum value of daily maximum temperature, the minimum value of daily minimum temperature, warm night days, warm day days, daily temperature range and warm period were mainly positively correlated with vegetation NPP; there are significant regional differences in the spatial and temporal changes of NPP of vegetation in the Yellow River Basin in recent 20 years; in arid and semi-arid areas, the increase of extreme precipitation was beneficial to vegetation growth to a certain extent, but the increase of extreme temperature was very unfavorable to vegetation growth in this area; in addition, vegetation growth in humid areas had a negative effect on extreme climate. The above research results have guiding significance for the vegetation growth monitoring and climate change response in the Yellow River Basin to propose protection strategies, promote vegetation ecological recovery, formulate effective disaster prevention and mitigation measures, and build a stable ecological barrier.
- References:
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Last Update:
2023-03-10