The Effects of an Initial Extreme Drought and Chronic Change in Precipitation on Plant Biomass Allocation in a Temperate Grassland.

There was an increasing trend in BGB/AGB from water addition plots, through control plots, to chronic drought plots, even if post hoc test found significant difference only between water addition and moderate drought plots (Figure 2c ). 4 Discussion We aimed to study how plant biomass pools and allocation to aboveground and belowground parts of a semiarid temperate grassland change under experimentally altered precipitation regimes.

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When looking at the two soil layers separately, BGB in the shallow (0–10 cm) layer was negatively impacted by both legacy effect of initial extreme drought and chronic severe drought (the effect of chronic precipitation change was marginally significant), whilst BGB in the deep (10–20 cm) layer was unaffected by either of the treatments (Figure 3 and Table 2b ).

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