森林土壤中纤维素和木质素的降解：对湿度、温度和酸度的响应。
Cellulose and lignin degradation in forest soils: Response to moisture, temperature, and acidity.
机构信息
Department of Bacteriology and Biochemistry, University of Idaho, 83843, Moscow, Idaho, USA.
出版信息
Microb Ecol. 1990 Dec;20(1):289-95. doi: 10.1007/BF02543884.
The concentration of lignin in plant tissue is a major factor controlling organic matter degradation rates in forest ecosystems. Microbial biomass and lignin and cellulose decomposition were measured for six weeks in forest soil microcosms in order to determine the influence of pH, moisture, and temperature on organic matter decomposition. Microbial biomass was determined by chloroform fumigation; lignin and cellulose decomposition were measured radiometrically. The experiment was designed as a Latin square with soils of pH of 4.5, 5.5, and 6.5 adjusted to 20, 40, or 60% moisture content, and incubated at temperatures of 4, 12, or 24°C. Microbial biomass and lignin and cellulose decomposition were not significantly affected by soil acidity. Microbial biomass was greater at higher soil moisture contents. Lignin and cellulose decomposition significantly increased at higher soil temperatures and moisture contents. Soil moisture was more important in affecting microbial biomass than either soil temperature or soil pH.
植物组织中木质素的浓度是控制森林生态系统中有机质降解速率的主要因素。为了确定 pH 值、水分和温度对有机质分解的影响，我们在森林土壤微宇宙中进行了为期六周的微生物生物量和木质素及纤维素分解的测量。微生物生物量通过氯仿熏蒸法测定；木质素和纤维素分解通过放射性测量。该实验采用拉丁方设计，pH 值为 4.5、5.5 和 6.5 的土壤分别调整至 20%、40%或 60%的水分含量，并在 4、12 或 24°C 的温度下培养。土壤酸度对微生物生物量、木质素和纤维素分解没有显著影响。微生物生物量在较高的土壤水分含量下更大。木质素和纤维素分解在较高的土壤温度和水分含量下显著增加。土壤水分对微生物生物量的影响比土壤温度或土壤 pH 值更重要。
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