Ministry of Education Key Laboratory for Western Arid Region Grassland Resources and Ecology, College of Grassland Sciences, Xinjiang Agricultural University, Urumqi, 830052, China.
State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, 730020, China.
Environ Res. 2022 Sep;212(Pt C):113409. doi: 10.1016/j.envres.2022.113409. Epub 2022 May 10.
Global environmental change is rapidly altering the dynamics of terrestrial vegetation, with implications for the functioning of the Earth system and the provision of ecosystem services. How vegetation responds to a changing environment is an important scientific issue, but there is a lack of coverage of the relative contributions that long-term variation and interannual variability in vegetation across seasons play in ecosystem response to global change. Here, we used four terrestrial ecosystem models provided by MsTMIP to examine four key environmental drivers of gross primary productivity (GPP) change over the period 1901-2010. Our findings showed that (1) for all seasons, interannual variability in climate change are the main environmental factor controlling seasonal GPP variability. (2) Summer is the key season controlling the variation of annual GPP, and its long-term trend and interannual variability can explain 61.50% of the variation of grassland GPP in China. (3) Interannual variability in summer climate change exceeded the CO fertilization effect and nitrogen deposition as the controlling component (more than 40%) of long-term variation in Chinese grassland GPP. These studies highlight the important role of interannual variability in climate in reshaping the seasonality of vegetation growth, and will provide a precursor to future environmental drivers that can be precisely attributed to global vegetation change.
全球环境变化正在迅速改变陆地植被的动态，这对地球系统的功能和生态系统服务的提供都有影响。植被如何应对变化的环境是一个重要的科学问题，但对于植被在季节间的长期变化和年际变异性在生态系统对全球变化的响应中所起的相对作用，还缺乏相关的研究。在这里，我们使用 MsTMIP 提供的四个陆地生态系统模型，研究了 1901-2010 年期间四个主要环境驱动因素对总初级生产力（GPP）变化的影响。研究结果表明：（1）对于所有季节，气候变化的年际变率是控制季节 GPP 变化的主要环境因素。（2）夏季是控制年总初级生产力变化的关键季节，其长期趋势和年际变率可以解释中国草原 GPP 变化的 61.50%。（3）夏季气候变化的年际变率超过了 CO 施肥效应和氮沉降，成为中国草原 GPP 长期变化的控制因素（超过 40%）。这些研究强调了气候年际变率在重塑植被生长季节性方面的重要作用，为未来可以精确归因于全球植被变化的环境驱动因素提供了先行研究。
