Journal
NEW PHYTOLOGIST
Volume 204, Issue 4, Pages 924-931Publisher
WILEY
DOI: 10.1111/nph.12952
Keywords
drought duration; drought manipulation type; drought stress; drying-rewetting cycle; N:P ratio; nutrient mineralization
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Funding
- Australian Research Council [FT100100779]
- National Science Foundation of China [41101054]
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Climate change scenarios forecast increased aridity in large areas worldwide with potentially important effects on nutrient availability and plant growth. Plant nitrogen and phosphorus concentrations (plant [N] and [P]) have been used to assess nutrient limitation, but a comprehensive understanding of drought stress on plant [N] and [P] remains elusive. We conducted a meta-analysis to examine responses of plant [N] and [P] to drought manipulation treatments and duration of drought stress. Drought stress showed negative effects on plant [N] (-3.73%) and plant [P] (-9.18%), and a positive effect on plant N:P (+6.98%). Drought stress had stronger negative effects on plant [N] and [P] in the short term (<90d) than in the long term (>90d). Drought treatments that included drying-rewetting cycles showed no effect on plant [N] and [P], while constant, prolonged, or intermittent drought stress had a negative effect on plant [P]. Our results suggest that negative effects on plant [N] and [P] are alleviated with extended duration of drought treatments and with drying-rewetting cycles. Availability of water, rather than of N and P, may be the main driver for reduced plant growth with increased long-term drought stress.
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