Effects of forest conversion and recovery age on fine root multi-element stoichiometry in subtropical forests

Springer Science and Business Media LLC - Tập 492 - Trang 675-686 - 2023
Mingyan Hu1,2, Zilong Ma1, Han Y. H. Chen3
1State Key Laboratory of Biocontrol, School of Ecology, Sun Yat-sen University, Guangzhou, China
2Key Laboratory for Humid Subtropical Eco-geographical Processes of the Ministry of Education, Institute of Geographical Sciences, Fujian Normal University, Fuzhou, China
3Faculty of Natural Resources Management, Lakehead University, Thunder Bay, Canada

Tóm tắt

Fine root multi-element stoichiometric coupling is essential to maintain terrestrial ecosystem functions. Although forest conversion has been a major driver globally in recent decades, its effect on multi-element stoichiometric coupling remains poorly understood. This study examined the ratios of fine root N or P relative to exchangeable cations (i.e., K, Ca, and Mg) along a chronosequence of secondary forests and Chinese fir plantations (5 to 41 years old) with reference to primary forests in subtropical China. On average, the ratios of live root N or P to exchangeable cations of plantations were higher than those of secondary forests, and the live roots N:Ca and N:Mg ratios in plantations were also higher than those of primary forests. The dead root N:K and P:K ratios of plantations were higher than those of secondary forests, while the dead root N:K, N:Ca, and N:Mg ratios of plantations and secondary forests were lower than those of primary forests. The ratios of live root N or P to exchangeable cations did not vary remarkably with stand age within plantations and secondary forests, except for the P:K ratio. However, the dead root N:Ca ratio increased with stand age for secondary forests and plantations. Overall, the live and dead root N:Mg, P:K and P:Mg, or N:K ratios decreased with soil depth. Our findings suggest that intensive forest management impairs fine root multi-element stoichiometric coupling in reference to primary forests and stand development has strong influences on fine root multi-element absorption and resorption.

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