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Drought effect on plant biomass allocation: A meta-analysis.

Anwar Eziz¹, Zhengbing Yan¹, Di Tian¹

¹Department of Ecology College of Urban and Environmental Sciences Peking University Beijing China.

Ecology and Evolution

|January 5, 2018

Summary

Drought significantly alters plant biomass allocation, increasing root mass while decreasing stem, leaf, and reproductive mass. The allometric partitioning theory better explains these drought-induced changes than optimal partitioning theory.

Keywords:

allometry biomass allocation biomass fraction drought life form meta‐analysis

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Area of Science:

Plant physiology
Ecology
Climate change adaptation

Background:

Drought is a major abiotic stress impacting plant function and ecological stability.
Climate change is predicted to increase drought frequency.
Comprehensive evaluation of drought's impact on biomass allocation, particularly reproductive tissues, is lacking.

Purpose of the Study:

To conduct a meta-analysis synthesizing 164 studies.
To elucidate patterns of plant biomass allocation under drought stress.
To evaluate drought's impact on reproductive tissue allocation.

Main Methods:

Meta-analysis of 164 published studies.
Synthesizing data on plant biomass allocation.
Comparative analysis across plant types (herbaceous vs. woody, annuals vs. perennials, cultivated vs. wild).

Main Results:

Drought significantly increased root mass fraction but decreased stem, leaf, and reproductive mass fractions.
Herbaceous plants showed increased root sensitivity, while woody plants had sharper reductions in reproductive allocation.
Drought negatively impacted leaf mass fraction more in woody than herbaceous plants.
Annuals' roots were more responsive to drought than perennials, but reproductive allocation was less sensitive.
Allometric relationships between plant tissues remained unchanged by drought.

Conclusions:

Allometric partitioning theory provides a better explanation for drought-induced biomass allocation shifts than optimal partitioning theory.
Plant responses to drought vary based on life form and growth strategy.
Understanding these allocation shifts is crucial for predicting plant responses to climate change.