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[1]LIU Min,LI Yue,HE Bing,et al.Spatiotemporal Dynamics of Grassland Phenology and Sensitivity to Extreme Precipitation in Autumn in Qinghai-Tibetan Plateau[J].Research of Soil and Water Conservation,2023,30(03):353-363,372.[doi:10.13869/j.cnki.rswc.2023.03.050]

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Spatiotemporal Dynamics of Grassland Phenology and Sensitivity to Extreme Precipitation in Autumn in Qinghai-Tibetan Plateau

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 03 Page number: 353-363,372 Column: Public date: 2023-04-10

Title:: Spatiotemporal Dynamics of Grassland Phenology and Sensitivity to Extreme Precipitation in Autumn in Qinghai-Tibetan Plateau

Author(s):: LIU Min^1,2, LI Yue¹, HE Bing³, ZHAO Wenwen³; (1.Hunan City University, Yiyang, Hunan 413000, China; 2.Key Laboratory of Key Technologies of Digital Urban-Rural Spatial Planning of Hunan Province, Yiyang, Hunan 413000, China; 3.College of Water Sciences, Beijing Normal University, Beijing 100875, China)

Keywords:: phenology; grassland; extreme precipitation; Qinghai-Tibetan Plateau

CLC:: TP79; S127

DOI:: 10.13869/j.cnki.rswc.2023.03.050

Abstract:: [Objective]Plant phenology is the most salient and sensitive indicator of the response of terrestrial ecosystem to climate change. Research for the change of plant phenology is of great significance for understanding and predicting the change of terrestrial ecosystem. [Methods]The interference mechanism of extreme precipitation on vegetation phenology for coping with extreme precipitation events was exploreed in the future. Based on the GIMMS NDVI from 1986 to 2015, the end of growing season(EOS)of grassland was extracted, and the temporal and spatial dynamics of EOS and its response to different extreme precipitation indicators on the Qinghai Tibet Plateau in the past 30 years were explored. [Results](1)In the past 30 years, in the Qinghai Tibet Plateau, the EOS of the northwest edge basically concentrated at the end of September, and that of the southwest and Southeast edges concentrated in the first ten days of November. The Himalayas and Handgun Mountains were the latest EOS regions in the whole region, and the north of Kunlun Mountains, Qaida Basin and surrounding areas were the earliest EOS regions.(2)EOS was mainly delayed, and the delay rate concentrated at 0～1.5 d/a. The change of EOS was relatively stable, but the fluctuations were relatively large in the east of Tangdula Mountains, Handgun Mountains and the east of Himalayas. The change trend of grassland EOS in the future is opposite to that in the past 30 years.(3)Rainfall intensity(SDII)had the greatest negative impact on EOS of alpine and subalpine meadow vegetation, and low intensity rainfall days(r10 mm)had the greatest positive impact on EOS. The EOS of alpine and subalpine grassland was mainly negatively affected by SDII, the days of moderate intensity rainfall(R20MM)and the longest continuous wet days(CWD). Desert steppe vegetation was mainly positively affected by CWD and negatively affected by R20MM and SDII. The negative sensitivity of EOS of mountain grassland vegetation to SDII was higher. EOS of mountain grassland vegetation was the most sensitive to the maximum one-day rainfall(RX1DAY). [Conclusion] The response of autumn phenology of different grassland vegetation on the Qinghai-Tibetan Plateau to different extreme precipitation events showed significant spatial heterogeneity. For example, the EOS of alpine subalpine meadows and alpine subalpine grasslands at higher altitudes were negatively affected by SDII and R20MM, while the desert grasslands in arid regions were positively correlated with SDII and R20MM. This research can provide information on how the autumn phenology of plants may change in the case of future climate warming and the increase of extreme precipitation events, which can provide guidance for the monitoring of vegetation and grassland growth on the Qinghai Tibet Plateau, the formulation of protection strategies against climate anomalies, and the construction of a stable ecological barrier.

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Last Update: 2023-04-10