Ji Zhang, Na Liu, Cicheng Zhang, Xinping Zhang, Xinguang He, Wulin Jiang, Jiajie Li, Ziwei Zhan, Dejing Peng, Dongjie Lv, Suixia Ni
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引用次数: 0
Abstract
Aims
The projected increase in drought intensity and frequency due to climate change is expected to exert sustained pressure on forest survival and growth in southern China. However, it remains unclear how plants adjust their water-use strategies and competitive mechanisms in response to water scarcity, as well as the effectiveness of these adaptations in mitigating drought-induced physiological stress.
Methods
In this study, we used water stable isotopes and sap flow measurements to evaluate the adjustment of water-use patterns and interspecific interactions in response to seasonal drought for two widespread species, Cinnamomum camphora and Ligustrum lucidum, in a subtropical secondary forest. The contribution of water from different soil depths was estimated using a Bayesian isotope mixing model.
Results
Both target species exhibited reduced sensitivity to atmospheric water demand and decreased water uptake from topsoil during drought. Although the two species showed temporary hydrological niche segregation and extracted more water from deep soil water to varying extent during drought, the water stress on plant transpiration was not effectively alleviated This is likely related to the fine root vertical distribution and intense local soil hydrological conditions.
Conclusion
Our results underscore the drought sensitivity and vulnerability of C. camphora and L. lucidum and the pressure of water resources induced by unique local environment conditions in subtropical secondary forests. These findings provide valuable insights into future forest management and species selection in plantation restoration efforts.
期刊介绍：
Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.
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