Water source partitioning and nitrogen facilitation promote coexistence of nitrogen-fixing and neighbor species in mixed plantations in the semiarid Loess Plateau
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Abstract
Aims
Effects of water source relations on the facilitation of nitrogen (N) acquisition between N2-fixing species (NFS) and neighbor species require further investigation, especially in water- and N-limited conditions.
Methods
Plant water sources and leaf physiological parameters of Hippophae rhamnoides and two neighbor species were investigated in pure and mixed plantations. Then, N stable isotope and N content of leaves were analyzed to examine the N facilitation of H. rhamnoides to neighbor species. Finally, interactions between plant water sources and N acquisition were detected using the dissimilarity analysis.
Results
H. rhamnoides and Pinus tabuliformis obtained water from similar soil depths, whereas, water sources were partitioned between H. rhamnoides and Ulmus pumila. Compared with pure plantations, P. tabuliformis and H. rhamnoides could not maintain a stable net photosynthetic rate (Pn) during the dry period in mixed plantation. However, H. rhamnoides and U. pumila in mixed plantation could alleviate drought effect on Pn through stomatal adjustments, comapred with pure plantations. Furthermore, H. rhamnoides facilitated N to neighbor species regardless of their water source relations, however, this facilitation only significantly improved the leaf N content of U. pumila.
Conclusions
Water source partitioning, stomatal adjustment, and N facilitation promoted stable coexistence of NFS and neighbor species in water- and N-limited environments.
Keywords
Loess Plateau Nitrogen facilitation Nitrogen stable isotope Stomatal adjustment Water stable isotopeAbbreviations
- N
Nitrogen
- NFS
N2-fixing species
- δ15N
Stable N isotope
- ETP
Potential evapotranspiration
- δD
Stable hydrogen isotope
- δ18O
Stable oxygen isotope
- SWC
Soil gravimetric water content
- gs
Stomatal conductance
- Pn
Net photosynthesis rate
- Ψm
Midday leaf water potential
- GLM
General linear model
- CV
Coefficient of variation
- PTHR
Pinus tabuliformis–Hippophae rhamnoides plantation
- UPHR
Ulmus pumila–H. rhamnoides plantation
- EMF
Ectomycorrhizal fungi
- AMF
Arbuscular mycorrhizal fungi
- CMNs
Common mycorrhizal networks
Notes
Acknowledgments
We are grateful to the constructive and insightful suggestions of section editor Rafael S. Oliveira and two anonymous reviewers. This work was supported by the National Natural Science Foundation of China (41977425), the National Key R&D Program of China (2017YFA0604801), and the Fundamental Research Funds for the Central Universities (2452016105).
Supplementary material
References
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