Zhang Puhang, Lin Jian, Hao Jiangtao, Li Chaochan, Quan Wenxuan
Guizhou Provincial Key Laboratory for Information Systems of Mountainous Areas and Protection of Ecological Environment, Guizhou Normal University, Guiyang 550001, China.
Metabolites. 2023 Feb 15;13(2):279. doi: 10.3390/metabo13020279.
The nutrient turnover of subtropical rhododendron forests is slow, natural regeneration is difficult, and the decomposition of litter is slow. Lignin, cellulose, and hemicellulose are the key factors affecting the decomposition rate of litters. In this study, the litters of three forest stands, namely evergreen broadleaf , evergreen broadleaf , and deciduous broadleaf mixed forest, were taken as the research objects to explore the dynamic changes and effects of lignin, cellulose, and hemicellulose contents in litters of different stands under indoor artificial control measures. Exogenous nitrogen, phosphorus, alkaline substances, and microbial agents were added to decompose litters in the laboratory for 140 days. Our results showed that (1) the contents of lignin and cellulose in the litters of the three stands decreased significantly in the early stage of decomposition and the content of hemicellulose was stable, and (2) low concentrations of nitrogen and phosphorus can accelerate the degradation of lignin, cellulose, and hemicellulose in litters of the three stands and thus promote the decomposition of litters. This study provides basic data for the nutrient return of artificial intervention in subtropical rhododendron forests in China.
亚热带杜鹃林的养分周转缓慢，自然更新困难，凋落物分解缓慢。木质素、纤维素和半纤维素是影响凋落物分解速率的关键因素。本研究以常绿阔叶林、常绿阔叶林和落叶阔叶混交林这三种林分的凋落物为研究对象，在室内人工控制措施下，探讨不同林分凋落物中木质素、纤维素和半纤维素含量的动态变化及其影响。添加外源氮、磷、碱性物质和微生物剂在实验室中对凋落物进行140天的分解。我们的结果表明：（1）三种林分凋落物中木质素和纤维素含量在分解前期显著下降，半纤维素含量稳定；（2）低浓度的氮和磷可加速三种林分凋落物中木质素、纤维素和半纤维素的降解，从而促进凋落物的分解。本研究为我国亚热带杜鹃林人工干预的养分归还提供了基础数据。
