Xie Yuangui, Liao Xiaofeng, Liu Jiming, Chen Jingzhong
College of Forestry, Guizhou University, Guiyang 550025, China.
Subordinate Departments of the Academy, Guizhou Academy of Sciences, Guiyang 550025, China.
Microorganisms. 2022 May 30;10(6):1125. doi: 10.3390/microorganisms10061125.
The decomposition of litter plays an important role in the return of forest soil nutrients, as well as the growth and productivity of plants. With this study, we aimed to determine the impact of litter mulching on different tissues of , a rare Chinese endemic species. In particular, seeds and pericarp are easily overlooked components of litter. In this study, we tested control (uncovered litter) and litter (leaf, branch, seed, and pericarp) mulching conditions and conducted a one-year litter decomposition experiment. The enzyme activities of urease enzyme (UE) and invertase enzyme (INV) were significantly improved by litter mulching. Catalase (CAT) enzyme activities in leaf, branch, and seed litter mulching were lower than in the control, whereas CAT activity in pericarp mulching was significantly higher than in the control. Although , , , and were the dominant microbes of topsoil in different mulching treatments, there were differences in the number and connectivity of microbial communities, and this change was correlated with soil organic carbon (SOC) and CAT enzyme activity. Compared with leaves and branches, seeds and pericarp as litter are also very important for nutrient return and affect topsoil microbes in forest, which may be of significance for the growth feedback of in biennial bearing.
凋落物的分解在森林土壤养分归还以及植物生长和生产力方面发挥着重要作用。通过本研究，我们旨在确定凋落物覆盖对一种中国珍稀特有物种不同组织的影响。特别是，种子和果皮是凋落物中容易被忽视的组成部分。在本研究中，我们测试了对照（无覆盖凋落物）和凋落物（叶片、树枝、种子和果皮）覆盖条件，并进行了为期一年的凋落物分解实验。凋落物覆盖显著提高了脲酶（UE）和转化酶（INV）的酶活性。叶片、树枝和种子凋落物覆盖下的过氧化氢酶（CAT）活性低于对照，而果皮覆盖下的CAT活性显著高于对照。尽管在不同覆盖处理中，、、、是表土的优势微生物，但微生物群落的数量和连通性存在差异，且这种变化与土壤有机碳（SOC）和CAT酶活性相关。与叶片和树枝相比，作为凋落物的种子和果皮对养分归还也非常重要，并影响森林的表土微生物，这可能对两年生结果期的生长反馈具有重要意义。
