Jomura Mayuko, Yoshida Riki, Michalčíková Lenka, Tláskal Vojtěch, Baldrian Petr
Department of Forest Science and Resources, College of Bioresource Sciences, Nihon University, Fujisawa 252-0880, Kanagawa, Japan.
Laboratory of Environmental Microbiology, Institute of Microbiology of the Czech Academy of Sciences, 142-20 Prague, Czech Republic.
J Fungi (Basel). 2022 Jun 27;8(7):673. doi: 10.3390/jof8070673.
Dead wood represents an important pool of carbon and nitrogen in forest ecosystems. This source of soil organic matter has diverse ecosystem functions that include, among others, carbon and nitrogen cycling. However, information is limited on how deadwood properties such as chemical composition, decomposer abundance, community composition, and age correlate and affect decomposition rate. Here, we targeted coarse dead wood of beech, spruce, and fir, namely snags and tree trunks (logs) in an old-growth temperate forest in central Europe; measured their decomposition rate as CO production in situ; and analyzed their relationships with other measured variables. Respiration rate of dead wood showed strong positive correlation with acid phosphatase activity and negative correlation with lignin content. Fungal biomass (ergosterol content) and moisture content were additional predictors. Our results indicate that dead wood traits, including tree species, age, and position (downed/standing), affected dead wood chemical properties, microbial biomass, moisture condition, and enzyme activity through changes in fungal communities and ultimately influenced the decomposition rate of dead wood.
枯木是森林生态系统中碳和氮的重要储存库。这种土壤有机质来源具有多种生态系统功能，其中包括碳和氮循环。然而，关于枯木特性（如化学成分、分解者丰度、群落组成和年龄）如何相互关联并影响分解速率的信息有限。在此，我们以中欧一个原始温带森林中的山毛榉、云杉和冷杉的粗枯木为研究对象，即枯立木和树干（原木）；原位测量它们作为二氧化碳产生的分解速率；并分析它们与其他测量变量之间的关系。枯木的呼吸速率与酸性磷酸酶活性呈强正相关，与木质素含量呈负相关。真菌生物量（麦角固醇含量）和水分含量是另外的预测因子。我们的结果表明，枯木特征，包括树种、年龄和位置（倒下/直立），通过真菌群落的变化影响枯木的化学性质、微生物生物量、水分状况和酶活性，并最终影响枯木的分解速率。
