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- Title
Legacy effects of nitrogen deposition on plant nutrient stoichiometry in a temperate grassland.
- Authors
Hu, Yan-Yu; Sistla, Seeta; Wei, Hai-Wei; Zhang, Zhi-Wei; Hou, Shuang-Li; Yang, Jun-Jie; Wang, Zheng-Wen; Wang, Jun-Feng; Lü, Xiao-Tao
- Abstract
Aims: Nitrogen (N) deposition has negative consequences for plant communities and ecosystem functioning. Nitrogen deposition is declining or is projected to decline in many regions due to the reduction of N-compound emissions. It remains unknown whether the cessation of N deposition will have legacy effects on plant nutrient stoichiometry. If there are stoichiometric legacy effects at the community-level from prior N enrichment, the contribution of changes in community composition relative to the stoichiometric responses of individual functional groups in driving these changes is unknown. Methods: We measured plant N:P ratio at both functional group level and community level in a temperate steppe in three consecutive years following cessation of a 7-year N addition experiment with a wide-range of total amount added N in which the total amount of N added ranged from 0 to 350 g m−2. Results: The total amount of N addition was positively correlated with tall rhizomatous grass productivity and negatively correlated with tall bunchgrass productivity. Plant N:P ratios at both functional group and community levels did not change across N addition gradient. Community composition shifts contributed less than intra-group variation to the total variation of community level nutrient status in response to historic N addition. Conclusions: Our results indicated that biological N:P imbalance in response to N deposition can be rapidly ameliorated after the cessation of N deposition. Such legacy effects of N deposition on plant nutrient status are largely driven by the changes of nutrient status of individual plants instead of N-induced shifts in community composition.
- Subjects
PLANT nutrients; PLANT capacity; STOICHIOMETRY; GRASSLANDS; PLANT communities; NUTRIENT cycles
- Publication
Plant & Soil, 2020, Vol 446, Issue 1/2, p503
- ISSN
0032-079X
- Publication type
Article
- DOI
10.1007/s11104-019-04357-7