Driving Forces of the Changes in Vegetation Phenology in the Qinghai-Tibet Plateau
Driving Forces of the Changes in Vegetation Phenology in the Qinghai-Tibet Plateau
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DOI：
10.3390/rs13234952
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发表时间：
2021-12-01
期刊：
影响因子：
5
通讯作者：
Zan, Mei
中科院分区：
文献类型：
--
作者：
Liu, Xigang;Chen, Yaning;Zan, Mei
物候变化是生态学和气候变化研究中的一个新兴热点。现有的青藏高原物候学研究主要集中在整体变化上，而忽略了不同地区物候变化的不同特征。本文以全球清查建模与制图研究（GIMMS 3g）归一化差异植被指数（NDVI）数据集为基础，探讨了1982 - 2015年青藏高原植被物候的时空变化。分析了季前气候因子和植被物候的响应机制，揭示了植被物候变化的驱动力。结果表明：（1）QTP中的生长季开始时间（SOS）和生长季长度（LOS）的年际波动较大;（2）在研究区，季前降水量的变化显著影响东北部的SOS东北地区生长季结束时间的延迟主要受季前气温和降水量的影响;（3）季前4、5月降水是不同植被EOS的主要驱动力，而季前气温和降水共同影响不同植被EOS。植被类型的差异和多样性共同导致了青藏高原不同地区植被物候的复杂变化。因此，研究不同区域植被物候变化的特征及其影响，对该地区的生态保护具有重要意义。
Phenological change is an emerging hot topic in ecology and climate change research. Existing phenological studies in the Qinghai-Tibet Plateau (QTP) have focused on overall changes, while ignoring the different characteristics of changes in different regions. Here, we use the Global Inventory Modeling and Mapping Studies (GIMMS3g) normalized difference vegetation index (NDVI) dataset as a basis to discuss the temporal and spatial changes in vegetation phenology in the Qinghai-Tibet Plateau from 1982 to 2015. We also analyze the response mechanisms of pre-season climate factor and vegetation phenology and reveal the driving forces of the changes in vegetation phenology. The results show that: (1) the start of the growing season (SOS) and the length of the growing season (LOS) in the QTP fluctuate greatly year by year; (2) in the study area, the change in pre-season precipitation significantly affects the SOS in the northeast (p < 0.05), while, the delay in the end of the growing season (EOS) in the northeast is determined by pre-season air temperature and precipitation; (3) pre-season precipitation in April or May is the main driving force of the SOS of different vegetation, while air temperature and precipitation in the pre-season jointly affect the EOS of different vegetation. The differences in and the diversity of vegetation types together lead to complex changes in vegetation phenology across different regions within the QTP. Therefore, addressing the characteristics and impacts of changes in vegetation phenology across different regions plays an important role in ecological protection in this region.