Drought intensity and duration effects on morphological root traits vary across trait type and plant functional groups: a meta-analysis.

Furthermore, root mean diameter of trees also showed a decreasing trend due to severe drought, whereas the effect size of severe drought on root mean diameter was non- significant in grasses and legumes (Fig. 2 ; Table 2 ).

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Severe drought effects across plant functional groups Among the plant functional groups, trees responded most negatively in terms of their root length to severe drought, and the root mean diameter of the trees were also marginally significant (Fig. 2 ).

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