Growth responses of Canada goldenrod (Solidago canadensis L.) to increased nitrogen supply correlate with bioavailability of insoluble phosphorus source
Anthropogenic nitrogen (N) inputs lead to the increase of phosphorus (P) demand for plants and plant species competition in a N enriched environment may hinge on its ability to utilize soil P sources. In soils, P mostly exists as insoluble phosphate compounds with three mineral elements: iron (Fe), aluminum (Al) or calcium (Ca), and it remains largely unknown whether invasive plant species are able to access such insoluble P sources and its interaction with N enrichment to gain competitive advantage. We determined the morphological traits, growth and nutrient status of an invasive plant Canada goldenrod (Solidago canadensis L.) cultured in soluble phosphate KH2PO4 (Ortho-P), and insoluble inorganic phosphate AlPO4 (Al–P), FePO4 (Fe–P), Ca5(OH)(PO4)3 (Ca–P) at three N supply levels. Results showed that S. canadensis was able to selectively utilize P from Al–P but not from Fe–P or Ca–P by increasing root number and length under N additions. The increasing growth in S. canadensis was closely correlated with the increasing foliar P. Ability to utilize insoluble P sources under enriched N environment serves as a competitive advantage for S. canadensis in Al rich soils. Effective control of S. canadensis invasion may need to consider soil P management in the context of atmospheric N deposition as well.
KeywordsCanada goldenrod (Solidago canadensis L.) Insoluble phosphorus Nitrogen addition Growth
This work was supported by the State Key Research Development Program of China (2017YFC1200103). the National Natural Science Foundation of China (31570414, 31770446), the Natural Science Foundation of Jiangsu (BK20150503, BK20150504), the Research and Innovation Project for College Graduates of Jiangsu Province (KYLX15_1088, 15A316, 15A318), the China Postdoctoral Science Foundation (2016M590416, 2017T100329), and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD). This work was also supported by the USDA National Institute of Food and Agriculture through McIntire-Stennis project to C.B. Zou and the Division of Agricultural Sciences and Natural Resources at Oklahoma State University.
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Conflict of interest
The authors declare that they have no conflict of interest.
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