Coupling of leaf economic and hydraulic strategy spectra facilitates desert restoration: A 70-year chronosequence study of Korshinks peashrub (Caragana korshinskii)

Abstract

Vegetation restoration is a pivotal component in the restoration and management of desert. But shifts in the ecological strategies of established plant species, and how that may impact desert restoration, are both largely unknown. Here, we studied changes to the leaf economic strategy spectra (ESS), hydraulic strategy spectra (HSS) and soil strategy spectra (SSS) of the legume Caragana korshinskii in 3-, 5-, 10-, 20-, 30-, 40-, 50-, 60-, and 70-year restoration in Baijitan area of the MuUs desert, and investigated the relationship of these spectrums for enhancing desert restoration. The results showed that, over the years, both spectra changed significantly. The economic strategy of this plant shifted from a ‘fast investment-return’ to a more conservative ‘slow investment-return’ strategy. Concurrently, its hydraulic strategy transitioned from an isohydric to an anisohydric behavior. Along the restoration chronosequence, the resource acquisition strategy spectra declined in its effect and importance while the carbon investment in leaf construction increased. In this way, the drought tolerance and embolic resistance of plants were enhanced over time. We identify a coupling relationship between the economic and hydraulic strategy spectra. Furthermore, changed in the ESS and HSS influence the SSS over restoration years, ultimately favoring ecological restoration. This research provides foundational data for optimizing the cultivation management of Caragana korshinskii in terms of restoration years, enhancing ecosystem stability and productivity, and protecting and restoring the ecological environment.