Ma Chen, Yin Xiuqin, Kou Xinchang, Wang Zhenhai, Li Xiaoqiang, Jiang Yunfeng, Wang Haixia, Bernard Ernest C
School of Geographical Sciences, Northeast Normal University, Changchun, Jilin Province, China.
Jilin Provincial Key Laboratory of Animal Resource Conservation and Utilization, Changchun, Jilin Province, China.
Environ Entomol. 2019 Jun 7;48(3):592-602. doi: 10.1093/ee/nvz035.
Cellulose and lignin decomposition is crucial for efficient nutrient cycling, yet few studies have been performed regarding the effects of soil fauna on cellulose and lignin decomposition. This study was conducted to better understand the effects of soil fauna on lignin and cellulose decomposition in the Changbai Mountain. Litterbags of two different mesh sizes were used to examine cellulose and lignin decomposition of 11 species of plant litter in the four vegetation zones of the Changbai Mountain North Slope over a 24-mo period. Cellulose and lignin clearly declined over time for all 11 species of plant litter. Cellulose decomposition rate faster than the rate of lignin decomposition in the majority of plant species. Soil fauna could promote the decomposition of cellulose and lignin. The abundance and richness of soil fauna in coniferous broad-leaved mixed forests were greater than in coniferous forest, Betula ermanii Cham. (Fagales: Betulaceae) forest, and alpine tundra. Soil fauna had a greater effect on Abies nephrolepis Maxim. (Pinales: Pinaceae) cellulose and lignin, whereas contribution rates were relatively lower in the Fraxinus mandshurica Rupr. (Contortae: Oleaceae) and Acer mono Maxim. (Sapindales: Aceraceae) litterbags at the end of the experiment. Litter quality was negatively correlated with the soil faunal contribution to litter decomposition directly. Overall, the findings of this study have implications for the effects of soil fauna on cellulose and lignin decomposition in the alpine ecosystem, and also can provide experimental evidence that soil faunal contribution is affected by soil faunal communities and litter quality.
纤维素和木质素的分解对于高效的养分循环至关重要，但关于土壤动物对纤维素和木质素分解影响的研究却很少。本研究旨在更好地了解长白山地区土壤动物对木质素和纤维素分解的影响。在24个月的时间里，使用两种不同网孔大小的凋落物袋，对长白山北坡四个植被带中11种植物凋落物的纤维素和木质素分解情况进行了研究。所有11种植物凋落物的纤维素和木质素含量均随时间明显下降。在大多数植物物种中，纤维素的分解速率快于木质素分解速率。土壤动物能够促进纤维素和木质素分解。针阔混交林中土壤动物数量和丰富度大于针叶林、岳桦林和高山冻原。土壤动物对臭冷杉纤维素和木质素分解影响较大，而在实验末期对水曲柳和色木槭凋落物袋的贡献率相对较低。凋落物质量与土壤动物对凋落物分解的贡献率呈直接负相关。总体而言，本研究结果对于高山生态系统中土壤动物对纤维素和木质素分解的影响具有重要意义，同时也能为土壤动物贡献率受土壤动物群落和凋落物质量影响提供实验证据。
