Extended Data Table 6 Impact of premature foliar senescence on nutrient content of L. laricina and P. mariana litter

From: Ecosystem warming extends vegetation activity but heightens vulnerability to cold temperatures

  1. Following the 9 April 2016 spring frost event, damaged foliage from trees that had lost frost hardiness began a period of senescence, culminating in heavy leaf fall during early May as air temperatures frequently exceeded 30 °C in the +9.0 °C plots (temperatures over 40 °C were observed in plot 10 and plot 17 on 5 and 6 May). Prematurely senescent litter was collected on 6 May from the ground underneath damaged trees in the two warmest treatments (+6.75 and +9.0 °C) (n = 3–7 trees). Normally senescent litter was collected on 4 November from ambient environment plots outside of the experimental treatments using litter baskets (n = 8 trees). Litter was analysed for carbon and nitrogen by combustion using 0.1-g samples of oven-dried and finely ground tissue on a TruSpec elemental analyser (LECO). Data are presented on a per cent dry matter basis.
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