Department of Microbiology and Plant Biology, University of Oklahoma, Norman, Oklahoma 73019, USA.
Co-Innovation Center for Sustainable Forestry in Southern China, College of Biology and The Environment, Nanjing Forestry University, Nanjing 210037 China.
Nat Commun. 2016 Jun 15;7:11973. doi: 10.1038/ncomms11973.
Past global change studies have identified changes in species diversity as a major mechanism regulating temporal stability of production, measured as the ratio of the mean to the standard deviation of community biomass. However, the dominant plant functional group can also strongly determine the temporal stability. Here, in a grassland ecosystem subject to 15 years of experimental warming and hay harvest, we reveal that warming increases while hay harvest decreases temporal stability. This corresponds with the biomass of the dominant C4 functional group being higher under warming and lower under hay harvest. As a secondary mechanism, biodiversity also explains part of the variation in temporal stability of production. Structural equation modelling further shows that warming and hay harvest regulate temporal stability through influencing both temporal mean and variation of production. Our findings demonstrate the joint roles that dominant plant functional group and biodiversity play in regulating the temporal stability of an ecosystem under global change.
过去的全球变化研究已经确定，物种多样性的变化是调节生产力时间稳定性的主要机制，以群落生物量的均值与标准差之比来衡量。然而，主要的植物功能群也可以强烈决定时间稳定性。在这里，在一个受 15 年实验增温和干草收获影响的草原生态系统中，我们揭示了变暖会增加而干草收获会降低时间稳定性。这与主要 C4 功能群的生物量在变暖下更高而在干草收获下更低相对应。作为次要机制，生物多样性也解释了生产力时间稳定性变化的一部分。结构方程模型进一步表明，变暖和干草收获通过影响生产力的时间均值和变异性来调节时间稳定性。我们的研究结果表明，在全球变化下，主要植物功能群和生物多样性在调节生态系统的时间稳定性方面发挥着共同作用。
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