**5. Conclusions**

In summary, tree fresh tissue-leached DOM production and biodegradability varied with leaf habit and organ type. During leaching, broadleaf tree fresh leaves produced greater amounts of DOM with higher aromaticity than coniferous tree fresh leaves, whereas broadleaf tree fresh twigs produced lower amounts of DOM with greater aromaticity than coniferous tree fresh twigs. Irrespective of organ type, broadleaf trees had higher tissue-leached DOM biodegradability than coniferous trees due to the lower DOC:DTN ratio and aromatic C content. Given the elevating incidences of extreme weather events such as hurricanes and storms and subsequent increased input of fresh plant tissues in the context of global climate change [46], these findings will help understand and predict the biogeochemical cycles in subtropical plantations in southern China.

**Author Contributions:** Investigation, supervision, writing—review and editing, J.-W.X.; investigation, methodology, data curation, J.-H.J.; methodology, supervision, writing—review and editing, D.-N.H.; investigation, methodology, data curation, Z.Z.; investigation, supervision, funding acquisition, writing—review and editing, R.M. All authors have read and agreed to the published version of the manuscript.

**Funding:** This study was supported by the Double Thousand Plan of Jiangxi Province (jxsq2018106044) to R.M.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable. **Data Availability Statement:** The data reported in this study are available on request from the corresponding authors. The data are not publicly available ye<sup>t</sup> due to the authors are writing some other papers by mining these data.

**Conflicts of Interest:** The authors declare no conflict of interest.
