[1]LI Jia,TANG Zhiguang,DENG Gang,et al.Remote Sensing Monitoring of Grassland Phenological Changes in the Qinghai-Tibetan Plateau During 2001—2020[J].Research of Soil and Water Conservation,2023,30(04):265-274.[doi:10.13869/j.cnki.rswc.2023.04.045.]
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Remote Sensing Monitoring of Grassland Phenological Changes in the Qinghai-Tibetan Plateau During 2001—2020
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
30
Number of periods:
2023 04
Page number:
265-274
Column:
Public date:
2023-06-10
- Title:
- Remote Sensing Monitoring of Grassland Phenological Changes in the Qinghai-Tibetan Plateau During 2001—2020
- Keywords:
- Qinghai-Tibetan Plateau; NDVI; grassland phenology; climate change
- CLC:
- S812
- DOI:
- 10.13869/j.cnki.rswc.2023.04.045.
- Abstract:
- [Objective] Exploring the spatiotemporal variation characteristics of grassland phenology on the Qinghai-Tibetan Plateau is of great scientific significance for the interaction mechanism between alpine ecosystems and regional climate, and the protection and construction of ecological security barrier. [Methods] Based on the MODIS NDVI time series products from 2001 to 2020, the NDVI peak, NDVI peak period, start of growth season(SOS), end of growth season(EOS)and length of growth season(LOS)were extracted by combining with asymmetric Gaussian function fitting method and dynamic threshold method. In addition, the spatiotemporal changes of grassland phenology and its response to climate change were analyzed. [Results](1)The obvious spatial distribution of grassland phenology showed that from west to east, the peak NDVI tended to increase, the NDVI peak period tended to advance, the SOS gradually advanced, the EOS gradually delayed, and the LOS gradually lengthened.(2)During the 20-year period, the interannual variation of grassland phenology over the Qinghai-Tibetan Plateau mainly indicated that the SOS showed an advanced trend(12.11% of the study area were significantly advanced), the EOS showed a delayed trend(18.49% of the study area were significantly delayed), and the LOS showed a lengthened trend(18.87% of the study area were significantly lengthened).(3)The lag time of SOS trend response to temperature and precipitation was 1～2 months over the Qinghai-Tibetan Plateau; the lag time of EOS trend response to temperature was 2 months, the lag effect of precipitation on EOS was not obvious. Considering the lag effect, temperature was the dominant factor affecting the interannual variation of the SOS and EOS. [Conclusion] Grassland phenology on the Qingahi-Tibetan Plateau has spatial heterogeneity, and temperature is the main factor affecting spatiotemporal changes of grassland phenology.
- References:
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Last Update:
2023-06-10